AI & Autonomous Agents 10 tools
⚡ AI Few-Shot Prompt Builder
In-context learning exemplar synthesizer. Enforces structured framing (XML tags vs JSON vs Markdown) and validates class distribution balance to prevent majority label bias.
💰 AI Model Cost & Speed Matrix
Comprehensive LLM economics & inference latency evaluator. Computes monthly token costs, prompt-caching savings, and tokens-per-second throughput across frontier and open-weight…
📊 AI Context Window Budget Lab
LLM token budget architect. Allocates context capacity across system prompt, RAG retrieval chunks, few-shots, conversation history, and reasoning tokens to prevent catastrophic…
📐 AI Vector Similarity Matrix
RAG & vector database embedding distance engine. Computes Cosine Similarity, Euclidean $L_2$, Dot Product, and Angular separation across semantic embeddings.
🔄 AI Agent ReAct Loop Studio
Autonomous agent execution cycle simulator (Yao et al., Princeton). Visualizes Thought $\to$ Action $\to$ Observation state transitions and recursion limit safeguards.
🔌 AI MCP Tool Protocol Inspector
Model Context Protocol (MCP) JSON-RPC 2.0 inspector and mock runner. Validates protocol compliance for Anthropic and open-agent tool calling servers.
🔍 AI Hallucination & Fact Check
Contextual grounding and hallucination risk evaluator for RAG pipelines. Pinpoints unverified entities, phantom dates, numbers, and ungrounded lexical assertions.
🛡️ AI Prompt Injection Defense
LLM adversarial attack analyzer. Tests agent prompts against prompt injections, delimiter hijacking, and jailbreaks, and auto-generates hardened XML containment wrappers.
🤖 AI Function Calling Validator
Validate LLM tool-calling declarations against JSON Schema (OpenAI, Anthropic & Gemini). Tests simulated model payloads, identifies missing required fields, and detects type mis…
🧠 AI Chain-of-Thought Parser
Reasoning token extractor for o1, o3, DeepSeek-R1, and Claude Extended Thinking. Separates internal scratchpad reasoning from client-facing output and detects cognitive self-cor…
Anime & Otaku Culture 10 tools
⏱️ Anime Binge Calculator
Calculate the exact time required to binge any anime series. Account for OP/ED skipping, filler elimination, playback speeds ($1.0\times - 2.0\times$), and view your estimated c…
🎌 Anime Phrases & Tropes
Decode iconic anime verbal tics (*dattebayo*, *de gozaru*, *nya*), battle cries (*omae wa mou shindeiru*), and dialogue tropes with native Japanese audio pronunciation.
🎪 Anime Con Budget Planner
Plan your anime convention expedition (Anime Expo, Otakon, Anime NYC, MCM). Split hotel costs across roommates, budget Artist Alley prints and scale figures, and enforce the gol…
🎵 Anime Music BPM Analyzer
Analyze the rhythmic energy of iconic Anime Openings and Endings. Explore the legendary Japanese TV 89-second broadcast rule, tap along with the real-time BPM tapper, and auditi…
👑 Anime Character Archetypes
Explore the psychological Dere spectrum of anime character archetypes. Inspect behavioral triggers, iconic representatives, and take the 4-question archetype diagnostic quiz.
📖 Manga to Anime Finder
Finished an anime season and want to continue the story? Find the exact manga chapter and volume where the anime left off, along with chapter pacing and estimated reading catch-…
📜 Anime Filler Guide
Distinguish manga canon, anime canon, and skippable studio filler arcs across major long-running anime. Search any episode number or generate a streamlined, filler-free binge list.
🔮 Anime Mood Matcher
Find the perfect anime tailored to your exact emotional state and available time. Filter by desired mood (cathartic tears, adrenaline hype, psychological mind-games, or cozy hea…
🕒 Anime Schedule Converter
Convert Tokyo Japan Standard Time (JST / UTC+9) anime broadcasts to your local timezone. Decodes Japanese TV late-night 30-hour clock conventions (e.g. 25:30 JST = 1:30 AM next…
🗡️ Cosplay Prop Scaler
Scale anime weapons and props proportionally to your exact real-world body height. Calculate blade length, hilt dimensions, EVA foam sheet requirements, and convention-legal wei…
Aquatics & Fishkeeping 10 tools
🌊 Aquarium Volume & Weight
Calculate gross and true net water volume, accounting for glass thickness, top water margin, substrate, and hardscape displacement. Computes total filled weight and structural f…
🌡️ Aquarium Heater & Chiller
Calculate precision heating wattage, evaporative surface loss, and cooling chiller ratings. Eliminates the catastrophic "stuck heater" disaster using fail-safe dual heater redun…
🍤 Fish Feeding & Vacation Planner
Generate weekly nutrition schedules with gut-clearing fast days. Calculate safe vacation fasting limits, prevent the catastrophic "neighbor overfeeding" disaster, and generate f…
🐠 Fish Stocking Compatibility
Build your community aquarium roster. Calculates true metabolic bioload, swimming strata distribution (top, mid, bottom), temperature and pH overlap, and flags aggression and sc…
💊 Fish Medication Dosing
Identify fish ailments by symptom and calculate precision medication dosages based on true net water volume. Includes invertebrate toxicity warnings and scaleless fish safety fl…
💡 Aquarium PAR Lighting
Calculate photosynthetically active radiation (PAR) penetration at substrate depth, daily light integral (DLI), and generate split photoperiod schedules to suppress nuisance algae.
🔄 Nitrogen Cycle Tracker
Master the nitrogen cycle without harming livestock. Calculate exact pure ammonia dosing, simulate bacterial colonisation curves (Nitrosomonas & Nitrospira), and validate your 2…
🧪 Water Change & Salinity
Precision aquatic water chemistry toolkit. Calculate exact nitrate dilution percentages, RO/DI remineralization buffers for dwarf shrimp and plants, and marine saltwater salt ba…
🪨 Aquarium Substrate Estimator
Plan your planted tank and hardscape layout. Calculate exact substrate volume, sloped perspective depth, commercial bag counts (3L/9L aqua soil, 20lb/50lb sand), and stone weigh…
🫧 Aquarium CO₂ Calculator
Dial in high-tech planted tank CO₂ injection. Calculate dissolved CO₂ concentration (ppm) from pH/KH equilibrium, simulate 4 dKH drop checker reagent colors, and estimate cylind…
Astronomy & Space 10 tools
🌌 Dark Sky Quality Planner
Turn a Sky Quality Meter reading, a Bortle class or a naked-eye limiting magnitude into the others, and see what each sky condition is worth for deep-sky work. Useful for choosi…
🌙 Lunar Phase & Illumination
Phase, illumination fraction, age and a drawn disc for any date and time — plus the next new and full Moons and how much moonlight is washing out the sky. Runs entirely offline.
🌟 Resolution & Limiting Magnitude
What can your aperture actually split, and how faint can it go? Computes the Dawes and Rayleigh limits, the theoretical limiting magnitude, and the doubles and deep-sky targets…
🌫️ Airmass & Extinction Calculator
How much of a star's light the atmosphere is stealing at any altitude, in which band, and how long you have before it is not worth imaging. Airmass climbs steeply below about 25°.
📸 Deep Sky Exposure Planner
How long a single subframe needs to be before the target signal clears the read and sky noise, and how many of them you need to stack. Includes the f-ratio squared penalty that…
🔭 Eyepiece & Magnification Calculator
Work out what an eyepiece actually gives you on a given telescope: magnification, exit pupil, true field of view and the practical limits. Covers Barlows and finds your maximum…
🔭 Telescope Collimation Check
How precisely your secondary and primary need to be aligned for the images you want, and what a star test tells you about the error you actually have. Based on the wavefront tol…
🔴 Redshift & Cosmic Distance
Put in a redshift and get the recession velocity, Hubble distance, light-travel time and the wavelength a known spectral line is shifted to. Distinguishes Doppler motion from co…
🕳️ Black Hole Horizon Calculator
Event horizon radius, surface gravity, Hawking temperature, evaporation time and the tidal force at the horizon for any mass. Compares stellar and supermassive black holes side…
🧭 Equatorial Coordinate Finder
Convert right ascension and declination into altitude and azimuth for your latitude and local sidereal time — or go the other way. Tells you whether a target is up, where to poi…
Birdwatching & Ornithology 10 tools
🌤️ Migration & Thermal Lift Calc
Predict hawk watches, songbird flyways, and coastal fallouts. Evaluates synoptic frontal boundaries, barometric rise, wind vectors, and solar thermal lift.
🌸 Hummingbird Nectar & Spoilage
Formulate natural 20% sucrose syrup and monitor microbial fermentation rates. Calculates exact water-to-cane-sugar ratios and temperature-driven spoilage limits.
🌻 Backyard Bird Feeder Nutrition
Avian nutritional formulation matrix. Matches seed types to bill morphology, prevents feeder pests (squirrels/starlings), and maintains disease-free feeding stations.
🎶 Bird Song Mnemonic Trainer
Acoustic field ornithology trainer. Decode avian vocalizations using phonetic mnemonics, pitch contours, and synthesized frequency playback.
📋 Birding Life List & Big Year
Personal field lifer ledger & annual Big Year tally. Records lifetime ticks, date of observation, habitat biome, and exports to CSV for eBird backup.
🔍 Avian Anatomy & Field Marks
Standard ornithological avian topography map. Learn precise feather tracts, facial stripes, wing coverts, and bill structures to nail difficult field identifications.
🔭 Binocular Optics & FOV Lab
Optical performance evaluator for birdwatchers. Calculates exit pupil, twilight factor, relative brightness, and converts field of view across feet, meters, and angular degrees.
🦅 Raptor & Flight Silhouette ID
Identify raptors and aerial birds in high-overhead flight by wing aspect ratio, tail proportions, wingtip finger slots, and characteristic wingbeat cadence.
🪶 Bird Molt Cycle & Ageing Lab
Avian Humphrey-Parkes (H-P) plumage terminology and molt-limit ageing engine. Decode annual feather replacement cycles between juvenile, alternate, and basic plumages.
🪺 Bird Nest Box Dimensions Guide
Cornell Lab of Ornithology nest box builder. Exact hole diameters, interior floor dimensions, and predator exclusion clearance for native cavity nesters.
Culinary & Food Science 15 tools
Meal Cost Calculator
Calculate total and per‑serving meal costs, split bills, and track ingredients. Perfect for meal planning, budgeting, and sharing costs with friends!
Weekly Meal Planner
Plan your meals for the entire week, track nutrition, generate shopping lists, and save your plans. Perfect for healthy eating, budget planning, and reducing food waste!
⏱️ Cooking Time Adjuster
PROFESSIONAL TOOL - Adjust cooking times when scaling recipes, changing pan sizes, or cooking at different temperatures. Used by chefs and home cooks worldwide.
☕ Coffee Brew Ratio & TDS Lab
Specialty Coffee Association (SCA) Golden Cup extraction calculator. Computes precise dose, brew water yield, multi-stage pour intervals, grind microns, and theoretical extracti…
🍕 Pizza Dough Ferment Master
Artisan pizza dough formula engine supporting Neapolitan (AVPN), New York Style, Detroit Pan, and Roman Al Taglio. Computes baker's percentages, cold fermentation schedules, and…
🍞 Sourdough Baker's Math Lab
Baker's percentage formula engine for artisanal sourdough. Factors in starter hydration, flour water absorption, and ambient room temperature bulk fermentation kinetics.
🍫 Chocolate Tempering Curves
Cocoa butter polymorphism & Beta-V crystallization guide. Calculates 3-stage thermal curve temperatures, 80/20 seeding ratios, and diagnoses fat bloom versus clean snap.
🍬 Candy & Sugar Stages Guide
Confectionery science & sugar crystallization guide. Features automatic boiling-point elevation correction, cold-water ball test simulations, and invert sugar balancing.
🍳 Recipe Converter
Scale recipes, convert measurements, and adjust serving sizes. Supports metric, imperial, cups, spoons.
🍷 Food & Wine Pairing Matrix
Sommelier palate chemistry engine. Evaluates flavor interactions between tannins, fats, acids, umami, and capsaicin to recommend optimal wine varietals and serving temperatures.
🥄 Cooking Unit Converter
PROFESSIONAL CONVERTER - Convert cooking units with food-specific densities. Accurate conversions for flour, sugar, butter, liquids, and more.
🥩 Sous Vide Time & Temperature
Precision immersion cooking guide based on thermal conductivity & USDA/FSIS pasteurization curves. Calculates exact bath temperatures, heating time to core, and searing parameters.
🥬 Lacto-Fermentation Salt Calc
Microbiological lacto-fermentation salt formulation tool. Calculates total-mass salinity, microbial succession timelines (Leuconostoc to Lactobacillus), and target pH < 4.6.
🧂 Meat Brine & Cure Salinity
Osmotic equilibrium brining & charcuterie cure engine. Calculates exact salt weights, curing salt (Prague Powder #1) 156 PPM food safety thresholds, and time windows.
🧊 Food Shelf-Life & Safety
USDA / FDA Food Safety & Inspection Service shelf-life database. Evaluates storage windows across Pantry, Refrigerator, and Freezer, plus Danger Zone temperature limits.
Dogs & Canine Care 10 tools
🍫 Dog Chocolate Toxicity Calc
Emergency veterinary theobromine toxicity calculator. Computes methylxanthine dose (mg/kg) to determine risk of cardiac arrhythmia, vomiting, and seizures.
🎯 Dog Clicker Trainer & Sound
Operant conditioning event marker. Features synthesized metallic clicker audio and a reaction-time latency game to calibrate your 0.8-second reward marking window.
🏠 Dog Crate Sizing & Den Guide
Orthopedic crate sizing & housebreaking den blueprint. Computes exact crate length, height, and maximum continuous confinement hours by age.
🐕 Dog Human Years Age Clock
UCSD School of Medicine DNA methylation epigenetic calculator (Wang et al., Cell Systems). Replaces the debunked 7-year myth with cellular age biology.
🐾 Puppy Adult Weight Forecaster
Canine Gompertz growth velocity forecaster. Predicts final adult weight based on current puppy weight, age in weeks, and breed skeletal frame category.
📯 Dog Ultrasonic Whistle Lab
High-frequency acoustic trainer (14,000 Hz to 22,000 Hz). Capitalizes on canine ultrasonic hearing up to 45 kHz for long-distance park recalls and focus interrupts.
🥩 Canine Daily Calorie Portioner
WSAVA metabolic energy calculator. Formulates exact Resting Energy Requirements (RER) and daily food cup portions to maintain ideal body condition.
🥩 Dog Food Safety & Toxicity Key
Emergency canine food safety encyclopedia. Search common household foods to identify lethal toxicities (Xylitol, grapes, alliums) versus safe nutrient-dense superfoods.
🦮 Dog Daily Walk & Activity Calc
Canine exercise prescription engine. Formulates daily cardio walking duration, growth-plate puppy limits (5 min/month rule), and sniffari mental enrichment.
🩺 Dog Vital Signs & Hydration
Clinical canine triage assessment. Evaluate skin turgor snapback, gum capillary refill time (CRT), normal body temperatures, and resting respiratory rates.
Finance & Money 35 tools
Break‑Even Calculator
Quick Examples:
Discount Calculator
Calculate final prices after discounts and taxes. Compare multiple deals and save your calculations.
Subscription Tracker
Track your subscriptions, manage renewals, and optimize spending
⚡ Energy Tariff Comparator
Suppliers advertise the unit rate because it is the flattering number, but the standing charge is paid every single day whether you use anything or not. This compares the real a…
⛽ Fuel Cost Calculator Pro
Calculate trip fuel costs, compare vehicles, track carbon footprint, and find optimal routes. Real-time calculations with environmental impact!
⛽ Web3 Gas Fee Estimator
Compare real-time decentralized transaction fees, DEX swap overhead, and smart contract execution costs across Solana, Base, Ethereum L1, and Polygon.
🍽️ Split Bill Calculator
Split restaurant bills, group expenses, or shared purchases with intelligent distribution options. ✨ Perfect for dinners, trips, and group activities!
🏠 Mortgage Calculator
Calculate detailed mortgage payments with amortization schedules, extra payments analysis, and regional comparisons. 💰 Monthly payments • Total interest • Payoff time • Amortiza…
🏠 Rent Calculator
Split rent among roommates, calculate per-person costs, and account for room size differences. Supports multiple currencies and custom splits.
💰 Christmas Gift Budget Planner
Plan, track, and optimize your Christmas gift spending. Avoid overspending with smart budgeting! ✅ Features: Gift ideas, price tracking, comparison shopping, receipt scanning
💰 Compound Interest Calculator
Calculate future value, growth projections, and compare investment scenarios. Visualize wealth accumulation over time with detailed breakdowns. ✅ Features: Regular contributions…
💰 Compound Interest Growth Visualiser
Calculate how your money multiplies over time with compound interest—the 8th wonder of the world!
💰 Debt Payoff Calculator
Calculate how long it will take to become debt-free and save money with different payoff strategies.
💰 Financial Budget Dashboard
Smart budgeting with predictive analytics, financial health scoring, and personalized optimization strategies.
💰 Personal Finance Dashboard
Complete personal finance dashboard: Track net worth, analyze assets vs liabilities, set financial goals, project future growth, and monitor your journey to financial freedom.
💰 Retirement Calculator
Estimate your retirement savings growth with compound interest. ⚠️ Educational only — consult a financial advisor.
💰 Salary Calculator
Calculate net salary after taxes, deductions, and contributions. ⚠️ Estimates only — consult a tax professional.
💰 Savings Calculator
Calculate how much your savings will grow with regular deposits and compound interest.
💰 Smart Loan Calculator
💸 Plan your finances: Calculate mortgage, car loan, personal loan payments with amortization schedule. Compare scenarios and save thousands!
💰 Student Loan Calculator
Calculate student loan payments, total interest, and repayment timeline. Compare different repayment plans and see how extra payments can save you money. This site is supported…
💰 Tax Estimator & Calculator
Estimate income tax, national insurance, and take-home pay for UK taxpayers. Based on 2024-25 UK tax bands.
💱 Currency Converter
Convert between 150+ currencies with live exchange rates. Using ExchangeRate-API with fallback to local data[citation:5][citation:8].
💳 Credit Card Calculator
Calculate how long it will take to pay off your credit card and save money with different payoff strategies.
💼 Freelance Rate Calculator
Stop undercharging. Calculate your true sustainable hourly and day rates by factoring in unbillable admin time, self-employment taxes, equipment expenses, pension, and paid time…
📅 Date Calculator
Calculate date differences, add/subtract days, and discover interesting date facts instantly.
📈 Investment Growth Calculator
Watch your money multiply: Calculate how small investments today can grow into significant wealth over time through compounding.
📈 ROI Calculator
Calculate Return on Investment with advanced metrics and comparisons. Supports annualized returns and multiple currencies.
📉 Inflation Impact Calculator
Calculate real-world purchasing power with historical data, multiple currencies, and personalized financial scenarios.
🔥 FIRE Retirement Planner
Calculate your exact Financial Independence number, years until retirement, and compound investment growth trajectory using the 4% Safe Withdrawal Rule.
🚗 Lease vs Buy Calculator
Compare the true cost of leasing a vehicle against buying it outright or on finance, over the same term. Accounts for deposit, monthly payments, residual value and what the car…
🛒 Grocery Budget Tracker
Track your grocery spending, categorize items, and stay within your budget with smart insights.
🛒 Unit Price Comparator
Shops price things so you cannot compare them: 340 g here, 12 × 30 g there, "3 for £5" on the shelf edge. Put in what is actually on the shelf and this reduces everything…
🧮 AI Differential Equations Solver
WORLD'S FIRST interactive DE solver with step-by-step explanations, visual graphs, and real-world applications. Used by universities worldwide!
🧲 Lenz's Law Eddy Current Tube
Lenz's law electromagnetic braking exhibit. Drop a strong neodymium magnet down metal tubes; circulating eddy currents oppose motion, creating levitation-like terminal float.
🧾 Take-Home Pay Breakdown
Turn an annual salary into what actually lands in your account, broken down by pay period. Uses 2024/25-style UK income tax bands, Class 1 National Insurance and a student loan…
Health & Fitness 23 tools
Calorie Calculator
Estimate daily calorie needs with BMR calculation, weight goals, and macronutrient breakdown. Auto-saves profiles for quick access.
Child Growth Tracker
Track your child's growth, compare with WHO percentiles, and monitor development milestones.
Lean Body Mass Calculator
Estimate your lean body mass using multiple formulas and get detailed body composition analysis.
⚕️ BMI Calculator
Calculate your Body Mass Index (BMI) with accurate WHO classification. BMI is a simple screening tool for weight categories that may lead to health problems.
⚖️ Ideal Weight & BMI
Get a comprehensive analysis of your ideal weight range using multiple scientific formulas and personalized factors.
⚡ Metabolic Age Estimator
Estimate your metabolic age based on your Basal Metabolic Rate (BMR) compared to population averages. 💡 Lower metabolic age indicates better metabolic health
⚡ TDEE & Calorie Calculator
Calculate your Total Daily Energy Expenditure (TDEE) and calorie needs for weight goals. Based on Mifflin-St Jeor equation.
❤️ Heart Rate Zones Calculator
Calculate training zones, VO₂ max estimates, heart rate variability (HRV), and recovery metrics. Professional-grade analytics for athletes!
❤️ Target Heart Rate Calculator
Calculate your optimal heart rate zones for effective exercise training. Based on American Heart Association guidelines.
🆘 Crisis Triage Guide
100% offline emergency triage protocols, acoustic CPR rhythm metronome, water survival calculator, and optical SOS distress beacon. Operates completely without internet during g…
🍼 Baby Sleep & Feeding Day Planner
Babies run on wake windows — how long they can stay awake before they need to sleep again. It changes fast in the first year and getting it wrong by half an hour is usually the…
🏃 Race Pace Predictor & Training Paces
Enter one recent race you actually ran, honestly, and this predicts the rest, gives you the pace to hold per kilometre or mile, and turns it into the five training paces you act…
🏃 VO₂ Max Calculator
Estimate your VO₂ Max — a measure of aerobic fitness. The higher the value, the better your cardiovascular endurance.
🏃♂️ Fitness Score Analyzer
Calculate your comprehensive fitness score with detailed insights and personalized recommendations. Based on scientific health metrics and activity analysis.
🏋️ Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method and understand your fitness level.
🏋️ One-Rep Max Calculator
Instantly estimate your maximum lifting capacity across multiple formulas.
💧 Daily Hydration Calculator
Calculate your personalized daily water intake needs. Track your progress throughout the day!
💧 Daily Water Intake Calculator
Estimate how much water you should drink each day based on your weight and activity level.
📏 Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio and see your health risk category based on WHO guidelines.
🔥 BMR & TDEE Calculator
Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) using scientifically validated formulas.
🚶 Steps to Calories Converter
Convert steps walked to calories burned with precision. Calculate energy expenditure based on steps, weight, and walking pace. See equivalent activities and track progress towar…
🛏️ Sleep Cycle Calculator
Calculate optimal wake-up times based on 90-minute sleep cycles for better rest. No affiliate links - this site is supported by user contributions .
🥗 Smart Macros Calculator
🏋️ Achieve your goals: Calculate protein, carbs, and fats for weight loss, muscle gain, or maintenance. Get personalized meal plans and food suggestions.
Home & DIY 17 tools
🎨 Paint Calculator
Calculate exactly how much paint you need for any room. No more buying 5 tins for a cupboard.
🏗️ Fence Calculator
Calculate posts, panels, gravel boards, concrete, and total cost for a garden fence. Works for panel fencing, closeboard, and picket styles.
📏 Shelf Bracket Calculator
Calculate the right bracket size, spacing, and load capacity for your shelf project.
🔧 Pipe Sizing Guide
Look up the right pipe diameter for any domestic plumbing job. Covers hot/cold water, central heating, and waste.
🔩 Screw & Drill Bit Size Chart
Look up the right drill bit for any screw size, wall plug colour, and pilot hole diameter. No more guessing.
🔩 Wall Anchor Selector
Not sure what fixings to use? Tell us your wall type and what you're hanging — we'll tell you exactly what to buy.
🖼️ Picture Hanging Calculator
Calculate the perfect height and hook position so your pictures hang straight and look professional.
🚗 Car Care & MOT Due-Date Tracker
Keeps the dates that are easy to miss and expensive to miss in one place: MOT, tax, insurance, service intervals, and the four items that actually cause MOT failures. Saved in y…
🛋️ Room Layout Planner
Drag and drop furniture to plan your room layout. Scale-accurate 2D top-down view.
🧊 Insulation Savings Calculator
Estimate how much you could save by insulating your loft, walls, or floor. Based on UK energy prices.
🧱 Brick Calculator
Calculate how many bricks you need for any wall — including mortar joints, waste, and pallets to order. Works for UK standard, metric, and imperial bricks.
🧱 Concrete Mix Calculator
Calculate cement, sand, gravel, and water for any concrete project — from fence posts to shed bases.
🧱 Tile & Flooring Estimator
Calculate tiles, planks, or carpet needed for any room — including waste and cuts.
🧻 Wallpaper Estimator
Calculate how many rolls of wallpaper you need — accounting for pattern repeat, doors, and windows.
🪣 Plastering Calculator
Calculate how much plaster, render, or screed you need for walls, ceilings, or floors. Includes bags, coverage, and estimated cost.
🪨 Gravel & Aggregate Calculator
Calculate how much gravel, slate, chippings, or aggregate you need for driveways, paths, patios, or garden beds. Includes tonnes, bulk bags, and cost.
🪵 Decking Calculator
Calculate boards, joists, posts, screws, and total cost for a timber decking project. Works for softwood, hardwood, and composite decking.
Interactive Art & Living Worlds 11 tools
⏳ Sandpile Mandala
An emergent self-organized criticality simulator. Drop grains of sand into an abelian lattice. When cells exceed four grains, they topple into cascading avalanches, spontaneousl…
✨ Constellation Weaver
Weave constellations across a shared celestial sphere. Place spectral stars, connect mythological asterisms, record astronomical lore, and preserve collective starlit storytelli…
🌀 3D Spirograph Nebula
A true 3D spirograph: torus knots, quantum roses and harmonograph spiros woven into space with perspective, additive glow, phosphor trails, echo interference, an orbiting starfi…
🌊 EchoPond Cymatics
A communal fluid-dynamics sanctuary. Cast water drops into a resonant pond. Wave ripples interfere via the physical wave equation, triggering soothing pentatonic water chimes wh…
🌿 ChronoGarden Terrarium
Cultivate a communal fractal botanical garden over time. Plant mathematical trees using Aristid Lindenmayer's L-Systems, cross-breed genetic strains, watch branches sway in the…
🎨 PixelVerse Canvas
An evolving communal pixel art tapestry. Paint with friends over time, record generational brushstrokes, watch the creation time-lapse from inception, and export high-res artwor…
🗿 VoxelMonolith 3D
An isometric 3D voxel monument sculpted across time. Place obsidian, glowing crystal, gold, and marble blocks layer by layer. Scrub the chronological time slider to watch histor…
🦠 Bioma Petri Dish
An artificial life (ALife) Darwinian simulation. Engineer genetic cellular strains, watch natural selection optimize camouflage and hunting behaviors across thousands of generat…
🧠 NeuroSynapse Graph
An organic neural graph where thoughts, insights, and memories connect via pulsating synaptic axons. Fire bio-electric action potentials, watch ideas resonate across clusters, a…
🧵 QuiltWeaver Tapestry
Weave an evolving mathematical patchwork tapestry with friends. Design geometric quilt blocks using wallpaper group symmetries, Truchet curves, and Islamic rosettes, then stitch…
🪐 HarmonicOrbit Loom
An evolving celestial music box. Launch orbiting planets into gravitational fields. As orbital bodies cross harmonic resonance spokes, they trigger soothing mathematical melodie…
Lucid Dreaming & Sleep 11 tools
✨ Lucid Dream Stabilizer Lab
Emergency stabilization maneuvers when lucidity triggers. Overcome the premature waking reflex, dream scene fading, and false awakenings.
🌀 WILD Hypnagogia Transition
Wake-Initiated Lucid Dreaming (WILD) mental anchor simulator. Ride the borderline hypnagogic transition directly from conscious waking state into full REM dream creation.
🌙 Sleep & REM Optimizer
Calculate optimal bedtimes and wake alarms based on natural 90-minute REM cycles. Wake up refreshed and eliminate morning sleep inertia.
🌙 WBTB Lucid Dream REM Planner
Wake-Back-To-Bed (WBTB) ultradian cycle planner based on Stanford sleep research. Targets Cycles 4 & 5 when REM duration and dream vividness peak by over 400%.
🎧 Lucid Binaural REM Stimulator
Real-time stereo binaural synthesizer with 40 Hz gamma stimulation (Voss et al., Nature Neuroscience 2014) and 6 Hz theta hypnagogic carriers. Requires stereo headphones.
🎯 Lucid Dream Quest Taskboard
Intentional task priming board. Having a clear pre-sleep mission dramatically reinforces prospective memory once lucidity strikes, eliminating disorientation.
👁️ Lucid Reality Check Trainer
Condition waking critical state-testing reflexes into your subconscious. Performing 10+ intentional reality tests during the day carries directly into REM dreams.
💊 Lucid Dream Supplement Clock
Pharmacokinetic timing for lucid dreaming oneirogens based on LaBerge's PLOS ONE studies. Synchronizes peak Acetylcholine plasma levels ($T_{\max}$) with late REM cycles.
📓 Lucid Dream Sign Analyzer
Identify personal recurring anomalies across your dreams (LaBerge 4-Category taxonomy). Recognizing your frequent dream signs is the #1 trigger for spontaneous lucidity.
🛡️ Sleep Paralysis Navigator
Demystify REM motor atonia. Learn how glycine and GABA temporarily paralyze skeletal muscles, and either smoothly wake up or launch directly into a vivid lucid flight.
🧠 MILD Lucid Dream Mantra Lab
Mnemonic Induction of Lucid Dreams (Stanford / Dr. Stephen LaBerge). Primes prospective memory to recognize the dream state right before entering REM sleep.
Mathematics 28 tools
Algebra Solver
Solve equations instantly. Type any equation and click Solve.
Calculus Helper
Work with derivatives and integrals. Enter a function of x, choose operation, and generate step‑by‑step results.
Geometry Calculator
Calculate areas, perimeters, and volumes for common shapes. Choose a shape, enter dimensions, and get results with formulas shown.
Grade Calculator 📊
Calculate weighted grades, predict final scores, and see what you need to achieve your target grade.
Linear Algebra Helper
Perform comprehensive linear algebra operations with step-by-step solutions, matrix visualization, and educational explanations.
Math Helper
Solve mathematical expressions, equations, and practice calculations. Supports arithmetic, algebra, trigonometry, and more!
Matrices Calculator
Perform matrix operations: addition, multiplication, determinant, inverse, transpose, and more. Supports up to 4x4 matrices with visual formatting.
⚡ Exponents & Roots Calculator
Calculate powers, roots, and exponential functions with detailed steps and visualizations. Perfect for students learning algebra and calculus.
🌌 Math Universe Explorer
Step beyond calculation into mathematical discovery. Visualize concepts, see proofs unfold, find connections humans have never seen.
🌍 International GPA Calculator
Calculate GPA for universities worldwide. Supports multiple grading systems and conversions.
🌐 Smart Graphing Calculator
Interactive math visualization: Plot functions, find roots, compute derivatives/integrals, solve equations, and create beautiful graphs. Perfect for students, teachers, and prof…
🎯 Foundation & Unit Circle
Sin = Opposite / Hypotenuse Cos = Adjacent / Hypotenuse Tan = Opposite / Adjacent
🎲 Probability Calculator
Calculate probabilities for dice, cards, distributions, and real-world scenarios.
🐚 Fibonacci & Special Sequences
Calculate arithmetic and geometric sequences and series. Includes step-by-step solutions and visual representations.
📉 Logarithm Calculator
Evaluate logarithms in any base, convert between bases, and solve for an unknown exponent. Shows the change-of-base working so you can follow it on paper.
📊 Advanced Percentages Explorer
Master percentages with advanced calculations, visualizations, and real-world applications. From basic math to financial analysis!
📊 Statistics Calculator
Comprehensive statistical analysis tool with descriptive statistics, probability distributions, hypothesis testing, and data visualization. This tool is supported by user contri…
📊 Weighted Grade Calculator
Enter your assignments with weights and scores to calculate your final grade.
📐 Equation Solver
Solve algebraic equations step-by-step. Supports linear, quadratic, and cubic equations. Try examples below!
📚 Exam Prep - Mathematics
COMPLETE MATH PREP - Generate practice problems with step-by-step solutions. Track your progress across 500+ questions covering all major topics.
📚 Scientific Formula Library
Interactive scientific formula calculator with detailed explanations, 3D visualizations, and step-by-step solutions. Perfect for students and professionals in STEM fields.
🔢 Fractions Calculator & Visualizer
Master fractions with calculations, visual representations, and step-by-step explanations. Perfect for students learning fractions!
🔢 Hex & Decimal Converter
Convert between hexadecimal, decimal, binary, octal, and ASCII with bitwise operations. Essential for developers, modders, and reverse engineering!
🔢 Sequences & Series Calculator
Find any term and the running sum of arithmetic or geometric sequences, test a geometric series for convergence, and see the working for the formula you used.
🧮 Advanced Number Theory Toolkit
Comprehensive number theory laboratory: Explore prime numbers, factorization, modular arithmetic, sequences, and advanced mathematical properties. Perfect for students, educator…
🧮 Complex Numbers Calculator
Perform operations with complex numbers in rectangular (a+bi) and polar (r∠θ) forms. Visualize results on the complex plane with step-by-step solutions. ✅ Supports: + − × ÷ √ ^…
🧮 Discrete Math Toolkit
WORKING CALCULATOR for Computer Science & Mathematics. Real calculations for set theory, combinatorics, and logic. Everything works instantly!
🧮 Maths Flashcards
Generate random maths flashcards for quick practice. Perfect for studying, teaching, or mental math warm-ups. 🎯 Interactive • Timed practice • Multiple topics • Progress tracking
MrProphecy Arcade 10 tools
🎛️ MrProphecy: Mix Board Challenge
Five faders, five rounds, shrinking tolerance. Hit the target mix from the written cue. Real MrProphecy tracks run on the desk.
🎧 MrProphecy: Name That Track
A real MrProphecy track plays from a random point — pick the title from four options. Ten rounds, no audio until you press start.
🏃 MrProphecy: Beat Runner
Endless runner starring MrProphecy. Jump the gaps, build speed, and the soundtrack is real MrProphecy tracks — playback only begins when you hit start.
💿 MrProphecy: Vinyl Catch
Catch falling records in the crate and dodge the cracked ones. Eight misses and the set is over. Real MrProphecy tracks play from the off.
🔤 MrProphecy: Title Scramble
Unscramble real MrProphecy track titles against a sixty-second clock. Music kicks in on start, not before.
🗺️ MrProphecy: Tour Manager
Twelve weeks to take MrProphecy from a Luton bedroom to a headline slot. Balance fans, cash and energy. Real tracks play while you decide.
🛡️ MrProphecy: Studio Defender
Bad takes rain down on the studio — pop them before they land. Waves get faster. Real MrProphecy tracks play once you start.
🤘 MrProphecy: Crowd Surf
Ride the crowd, collect gold notes and dodge flying drinks. Three lives, endless festival. Real MrProphecy tracks start with the game.
🥁 MrProphecy: Rhythm Tap
Four-lane rhythm game scored on timing and combo, running over real MrProphecy tracks. Nothing plays until you start.
🧠 MrProphecy: Beat Memory
Simon-style pad memory that grows by one step each round, scored over real MrProphecy tracks. Audio starts with the game.
Museum & Collection 12 tools
☀️ The Daylight Lab
Watch sunlight enter a room and cast shadows as the sun moves across the sky. See how window orientation, room depth, and time of year affect daylight levels. The sun path diagr…
⚗️ The Element Hall
All 118 elements as numbered museum exhibits: discovery year, discoverers, name origin, category, state at room temperature — plus curator's notes on two dozen showpieces and an…
⚡ The Watt Exchange
Energy literacy in the only currency that needs no conversion: bananas, stairs and phone charges. Decode any item, your monthly meter, and the kinetic energy of a moving car (E…
🎭 The Illusion Gallery
Three statistical traps you can run with your own eyes: survivorship bias (the WW2 planes), Simpson's paradox (the kidney-stone study where one treatment wins overall yet loses…
🏗️ The Stress Gallery
Apply loads to a beam and watch stress propagate in real time. See shear force and bending moment diagrams update live. The colour map shows where failure begins — red zones are…
🏛️ Deep Time Museum
Walk 4.6 billion years of Earth's story in one scroll — Hadean to Holocene, an era per hall, with an Earth-in-one-day clock, jump-chips and a catalogue-numbered plaque for every…
💧 The Pipe Lab
Watch water flow through pipes in real time. See Bernoulli's principle in action — where the pipe narrows, water speeds up and pressure drops. Particles show laminar vs turbulen…
📐 The Constant Treasury
The constants that run the universe, as numbered exhibits — provenance, exact or measured, and what each does. Includes a live pi engine (Machin's formula computed with big inte…
🔊 The Echo Chamber
Watch sound bounce around a room in real time. See wavefronts propagate from a source, reflect off walls, and decay as materials absorb their energy. Adjust room size, wall mate…
🧠 The Bayes Workshop
Conditional probability you can feel: what a positive test really means (Bayes' theorem), a 300-game Monty Hall simulation, and the prosecutor's fallacy — with a 10,000-person g…
🧪 The Moisture Lab
Watch water migrate through building materials via capillary action — the same force that makes a sponge soak up water and makes your walls draw moisture from the ground. See wh…
🧱 The Thermal Wall
Watch heat flow through building materials in real time. A thermal wave propagates from a warm room through brick, insulation, glass or wood — Fourier's law made visible. See wh…
Music & Audio 23 tools
BPM Tap Counter (Pro)
Instant, free online BPM Tap Counter (Pro) tool. No signup required.
🎚️ Audio Tone Generator
Generate pure acoustic tones, test speaker frequency responses, and monitor live audio waveforms using the Web Audio API.
🎛️ YouTube DJ Mixer
Mix YouTube videos live like a professional DJ. Crossfade between tracks, apply effects, and create seamless mixes. 🎧 Live mixing • Crossfader • EQ • Effects • YouTube integration
🎤 Recording Basics
Learn fundamental recording techniques. ⚠️ Educational only — always verify with professional resources.
🎵 Chord Finder
Identify chords from selected notes. Perfect for songwriters and beginners!
🎵 Christmas Carol Karaoke Machine
Sing along to Christmas classics with synchronized lyrics, pitch detection, and festive backgrounds! 🎤 Features: 50+ carols, pitch meter, key changer, duet mode, recording
🎵 Ear Trainer
Practice recognizing musical intervals with visual guides. ⚠️ For educational purposes — always verify with professional resources.
🎵 Interval Ear Trainer
Essential for musicians: Learn to identify intervals by ear. Perfect for singers, composers, and anyone learning music theory!
🎵 Music Transposer
Transpose chords, melodies, and entire progressions between keys. ⚠️ EDUCATIONAL TOOL — Verify with music teacher or professional resources.
🎵 Professional Metronome
Precise audible & visual metronome with subdivisions, tap tempo, and tempo presets. ⚠️ Enable sound in your browser
🎵 Song Writer (General Advice)
Brainstorm song ideas, lyrics, and structure. ⚠️ Educational only — always verify with a teacher or professional resource.
🎵 Tempo & BPM Map
Create tempo maps for musical compositions with BPM calculations and time conversions. Educational tool for musicians and composers.
🎵 Ultimate Music Quiz
Interactive music knowledge challenge: Test your expertise across theory, history, instruments, and pop culture. Complete with scoring, explanations, and shareable results!
🎶 Instrument Care Guide
Get detailed care instructions with maintenance schedules, required tools, and professional tips for your specific instrument.
🎸 Capo Calculator
Find capo placement for key transposition, chord conversion, and song adaptation. Supports sharps/flats, multiple fret options, and tuning adjustments.
🎸 Instrument Tuner Reference
Reference notes for tuning your instrument. Educational only — verify with your ear or a professional tuner.
🎹 Scale Trainer
Practice scales in different keys. Educational only — always verify with a music teacher or professional resource.
🎼 Chord Progression Builder
Build, analyze, and explore chord progressions for songwriting. Perfect for musicians and composers!
🎼 Circle of Fifths Explorer
Pick any key to see its relative minor, the closely related keys either side of it on the circle, and the seven diatonic chords built from that scale. Everything runs offline in…
🎼 Sheet Music Reference Generator
Generate detailed sheet music references with proper notation guidance. ⚠️ Educational only — always verify with a teacher or professional resource.
🥁 Beat BPM Tapper
Tap to the rhythm of any track or beat. Calculates exact BPM, musical delay times in milliseconds, reverb pre-delay values, and audio frequency modulation timings for music prod…
🥁 Rhythm Generator
Generate rhythm patterns for practice and composition. ⚠️ Educational only — verify with professional resources.
🧠 Binaural Neuro Tuner
Generate scientifically tuned binaural beats and isochronic frequencies using pure Web Audio synthesis. Entrain your brainwaves for laser focus, flow state, deep meditation, or…
Natural Remedies & Herbs 10 tools
⚠️ Herb & Prescription Safety
Clinical botanical pharmacodynamics checker. Cross-references herbal compounds against prescription drug classes to prevent CYP450 enzyme conflicts and adverse events.
⚡ Natural Electrolyte Tonic Lab
Formulate whole-food isotonic rehydration elixirs matching World Health Organization (WHO) cellular osmolarity standards (245 mOsm/L) for sickness recovery, fevers, and intense…
🌱 Adaptogen Synergy Matcher
HPA-axis endocrine matching engine. Aligns clinical botanical adaptogens to your stress phenotype (high nighttime cortisol vs chronic adrenal exhaustion).
🌿 Herbal Tincture Ratio Calc
Pharmacopoeial weight-to-volume maceration calculator. Formulates herb-to-solvent ratios (1:5 dry / 1:2 fresh) and calculates alcohol-to-water dilution for target phytochemical…
🍯 Cold & Flu Botanical Guide
Phase-specific botanical recovery matrix. Synchronizes natural remedies to viral replication curves—from neuraminidase inhibitors at hour zero to diaphoretic fever teas and expe…
💆 Acupressure Point Relief Map
Non-invasive somatic reflexology locator. Guides precise anatomical pressure points for rapid drug-free relief of headaches, nausea, anxiety, and cramps.
💧 Essential Oil Dilution Calc
Aromatherapy dermal safety calculator (Tisserand Institute standards). Computes precise drop counts per carrier oil volume to prevent sensitization and burns.
🧴 Herbal Salve & Balm Crafter
Formulate medicinal balms and herbal salves. Calculates exact beeswax-to-infused-oil ratios for soft rubs, standard tins, or heat-resistant summer lip balms.
🩹 Herbal Poultice & Compress
Topical acute botanical applications (fomentations & cataplasms). Formulates venom drawing pastes, bone-healing comfrey packs, and castor oil compresses.
🫖 Herbal Tea & Extraction Timer
Scientific phytotherapy extraction guide. Tailors thermal temperatures, liquid-to-herb ratios, and brew times between volatile floral infusions and dense root decoctions.
Productivity & Lifestyle 109 tools
Birthday Reminder
No birthdays added yet. Add your first birthday above!
Career Path Planner
Map out your career goals, milestones, and track progress over time. Save and manage multiple career plans.
Cat Photo Viewer
Browse cat photos from free public APIs. Features infinite scrolling, favorites, and breed info.
Chemistry Helper
Calculate molar mass, balance equations, analyze compounds, and reference periodic table data.
Gift Helper 🎁
Find the perfect gift with smart suggestions, reminders, and inspiration for every occasion.
Goal Tracker 🎯
Set, track, and achieve your goals with progress monitoring, milestones, and motivational reminders.
Laundry Tracker
Log laundry loads, track completion, and monitor laundry habits with statistics.
Meeting Planner & Scheduler
Find optimal meeting times across multiple time zones, track availability, and generate meeting agendas. Perfect for remote teams, interviews, and collaborative scheduling!
Party Planner
Plan your party with date, location, and guest list.
Password Generator
Create strong, random passwords instantly. Customize length and character sets.
Pet Care Tracker
Log pet care tasks like feeding, walking, or grooming.
Smart Garden Task Planner
Plan, track, and grow your perfect garden with AI-powered suggestions and smart scheduling.
Which Year Are You? 🕰️
Discover your internet personality era based on your tastes, habits, and vibes. ← Share your result!
⏰ Reminder Tool
Create reminders that stay saved in your browser. Works offline — data saved locally.
⏱️ Advanced Timer & Stopwatch
Advanced timer with countdown, stopwatch, intervals, lap times, and multiple alarms. Perfect for workouts, cooking, study sessions, and productivity.
⏱️ Cron Schedule Builder
Construct cron expressions with interactive dials, read instant plain-English explanations, and preview the next 10 trigger times.
⏱️ Deep Focus Timer
Advanced Pomodoro timer with productivity tracking, ambient sounds, and progress visualization. Stay focused, maximize productivity!
⏱️ Pace Reading Timer
Time yourself reading a passage to measure your words-per-minute rate.
⏱️ Pomodoro Flow Timer
Level up your daily productivity with science-backed 25-minute focus intervals, audio finish chimes, streak tracking, and gamified XP rewards for completed sprints.
⏱️ Work Hours & Pay Calculator
Calculate work hours, breaks, overtime, and pay. Track multiple shifts, different pay rates, and generate detailed timesheets. Perfect for freelancers, contractors, and employees!
⚖️ Boxing Judging Criteria Weigher
Score a single round against the four official criteria — clean punching, effective aggression, ring generalship and defence — in their correct priority order. Shows which crite…
⚖️ Boxing Weight Class & Weigh-In Checker
Find the correct division for any weight, check whether a fighter has made the limit, and see rehydration-clause and catchweight implications. Covers all seventeen professional…
⚖️ Decision Matrix Scorer
Evaluate complex career, business, or lifestyle choices using weighted multi-criteria scoring. Removes emotional bias and highlights the winning tradeoff.
⚡ AI Prompt Studio
Turn vague thoughts into high-performance AI prompts used by senior prompt engineers. Constructs rigorous prompts with Chain-of-Thought reasoning, XML delimiters, output schemas…
⚽ Premier League Live
Live Premier League data scraped from current online sources. Teams update automatically.
✈️ Travel Trip Planner
Plan your perfect trip with detailed itineraries, budget tracking, and smart recommendations. Get personalized suggestions based on your preferences!
✍️ XMAS Card Writer Assistant
Struggling with what to write? Get personalized Christmas card messages for everyone on your list! Save time, spread joy!
🌍 Time Zone Converter
Convert any date and time between time zones. Supports all major world time zones.
🌐 Censorship Monitor
Monitor Wikipedia blocks and Reddit content moderation in real-time. ⚠️ Educational tool - uses public APIs
🌿 Garden Planning Assistant
Plan, track, and optimize your garden with planting schedules, care reminders, and plant databases. Grow your perfect garden!
🎁 Secret Santa Generator
Organize a perfect Secret Santa gift exchange with automatic matching, restrictions, and wish lists! ✅ Supports: Family restrictions, wish lists, budget tracking, email notifica…
🎄 Christmas Card Maker
Design and generate beautiful, custom HTML Christmas cards in seconds. Perfect for emails, social media, or personal websites.
🎄 Christmas Countdown
Count down to Christmas with real-time tracking, festive facts, and daily suggestions! 🎅 Shows days, hours, minutes until Christmas morning
🎅 Santa Tracker & Message Center
Track Santa's journey and send him a message! Get a personalized response from the North Pole. Perfect for kids and kids-at-heart!
🎅 Santa's Naughty List Quiz
Take this scientific* holiday quiz to discover if you're getting coal or presents this Christmas! *Not actually scientific
🎨 Advanced Palette Swapper
Advanced color manipulation with multiple effects, palette extraction, and real-time preview. Transform images with professional color tools!
🎨 CSS Glass & Gradients
Design modern frosted glass (glassmorphism) components and mesh gradients. Real-time visual canvas with 1-click cross-browser CSS.
🎬 Clip‑to‑Shorts Repackager
Upload a gameplay clip, pick a segment, and export a perfectly framed vertical short (9:16) or other preset. Adds caption safe zone and optional watermark.
🎮 Sprite Sheet Studio
Advanced sprite sheet cutter for game developers. Slice, preview, animate, and export sprite sheets with professional tools. ✨ Supports PNG, JPG, GIF, and WebP formats
🎮 Tic Tac Toe Game
Play Tic Tac Toe against the computer or a friend. Features three difficulty levels and game statistics. Classic strategy game reimagined.
🎯 Corporate Meeting Bingo
Mark off buzzwords as your colleagues say them. First to get 5 in a row wins (and loses, because you're still in the meeting).
🎯 Exam & Study Planner
📚 A comprehensive exam planning and study management system for students and professionals. Track exams, create study schedules, set goals, and manage revision.
🎯 Memorization Helper
Add items to memorize, then test yourself by revealing them later. Perfect for studying, learning vocabulary, or remembering important facts. 💡 Click items to hide/reveal • Drag…
🎯 Practice Tracker
Track and analyze your practice sessions with detailed metrics and progress visualization. Set goals, track habits, and measure improvement.
🎯 Smart Quiz Generator
Create custom quizzes, track progress, and test your knowledge. Perfect for studying, training, or self-assessment. Add multiple choice, true/false, or open-ended questions!
🏠 Adulting Score Calculator
How well are you really adulting? Take this brutally honest assessment and find out.
🏠 Advanced Household Chore Tracker
Manage household chores, assign tasks, set schedules, and track completion with reminders. Perfect for families and shared living!
🐕 Dog Photo Viewer
COMPLETE DOG VIEWER - Browse thousands of dog photos with breed information, favorites, and infinite scrolling. Multiple API sources for maximum reliability.
👁️ WCAG Contrast & Vision
Test color contrast ratios against WCAG 2.2 accessibility standards (AA / AAA) and simulate color-vision deficiencies in real time.
👊 Boxing Punch Stat Tracker
Live compubox-style punch counter. Tap as you watch to log jabs and power shots landed or thrown, and get instant connect percentages plus a work-rate comparison.
👨⚖️ Boxing Three-Judge Decision Simulator
Enter three official cards and get the correct verdict — unanimous, split, majority, or draw. Handles every decision type including the frequently confused majority draw.
💢 Blame Deflector 3000
Something went wrong? Don't worry — it's definitely not your fault. Let science* find someone else to blame. *Not science.
💸 Tip & Split Calculator
Calculate tips, split bills, and see exactly how much everyone owes. Supports multiple currencies!
📄 Professional CV Builder
PROFESSIONAL CV CREATOR - Build ATS-optimized CVs with multiple templates, real-time preview, and export options. Used by career coaches worldwide.
📅 Event Reminder
Set reminders for upcoming events with notifications, priorities, and recurrence options.
📅 Project Deadline Calculator
Calculate project timelines with buffer days, weekend exclusions, and milestone planning. Plan realistically and track progress.
📈 Boxing Momentum & Swing Round Analyser
Paste a completed card and see the shape of the fight — momentum swings, the longest run of rounds, who finished stronger, and which rounds were decisive enough to change the re…
📈 Habit Tracker
Build consistent habits with visual streaks and daily tracking. Save your progress automatically!
📈 Percentage Change Calculator
Calculate percentage increase or decrease between two values.
📊 Barcode Check Digit Validator
Validate or generate the check digit for EAN-13, UPC-A, EAN-8, ISBN-13, ISBN-10, GTIN-14 and ITF-14 barcodes. Shows the arithmetic so you can see exactly why a code passes or fa…
📊 Boxing Fight Outcome Projector
Mid-fight maths for fans and cornermen. Enter the score so far and see exactly what each fighter needs in the remaining rounds — including whether a knockout has become the only…
📋 Task Prioritizer Matrix
Use the Eisenhower Matrix to prioritize tasks by urgency and importance. Based on the time management framework.
📐 SVG Path Visualizer
Inspect, edit, and optimize SVG path data (d="...") in real time. Visualizes anchor nodes, control handles, bounding box, and minified code.
📚 Smart Flashcards
Create beautiful, interactive flashcards for effective studying. Supports rich text, categories, and spaced repetition.
📚 Study Planner
Plan your study sessions, track progress, and stay focused with a built-in Pomodoro timer. All data saved locally in your browser.
📜 Advanced History Timeline Builder
Create interactive timelines, explore historical databases, and visualize events across civilizations. Perfect for students, educators, and history enthusiasts!
📝 Word Counter & Analyser
Count words, characters, sentences, and estimate reading time. Useful for essays and assignments.
📧 Passive Aggressive Email Translator
Type what you actually want to say. We'll make it sound professional. Ish.
📶 Wi-Fi QR Pass Generator
Generate an instant, scannable QR code for your home, studio, or office Wi-Fi network. Guests can scan with their phone camera to connect immediately without typing complicated…
📷 Instant QR & Image Reader
Decode QR codes instantly from uploaded screenshots, images, or your live camera feed. 100% private in-browser decoding — photos never leave your device.
🔍 Boxing Scorecard Comparator
Compare your card against the official judges round by round. Highlights exactly where you disagreed, measures your agreement rate, and flags the swing rounds that decided the f…
🔐 Crypto & Hash Suite
Generate cryptographic hashes (SHA-256, SHA-512, MD5), HMAC signatures, and multi-format encodings (Base64, Hex, URL). Fast, client-side, and zero-knowledge.
🔐 File Hash Checker
Verify file integrity and calculate cryptographic hashes. Compare hashes to verify file authenticity!
🔑 JWT Token Inspector
Decode and audit JSON Web Tokens offline. Zero network calls — your security tokens never leave your browser.
🔔 Boxing Round Timer & Bell
Full bout timer with authentic bell and ten-second clapper, generated live in your browser. Configure round length, rest interval and round count for sparring, training or scori…
🔠 Fluid Type Scale Generator
Generates a typographic scale where every size scales smoothly between two screen widths, using the CSS clamp() function — no media queries, no jump at a breakpoint, and no text…
🔢 Permutations & Combinations
Calculate permutations (nPr) and combinations (nCr) — how many ways to arrange or select items.
🔤 ASCII Banner Generator
Generate retro ASCII text banners and terminal art for code headers, GitHub READMEs, Discord bots, and CLI scripts.
🔥 Habit Streak Grid
Track daily habits and build unstoppable momentum with a GitHub-style contribution heat map. Saves automatically in your browser.
🔧 JSON & YAML Studio
Format, validate, convert between JSON & YAML, and compare structural diffs side-by-side. 100% private in-browser processing.
🔧 JSON Beautifier & Linter
Format, minify, validate, and debug JSON payloads with exact syntax error line tracking. 100% private in-browser parsing.
🔮 Coincidence Finder & Synchronicity Tracker
Discover meaningful coincidences and synchronicities across multiple real-time data sources. Tracks news, numbers, dates, names, and global patterns!
🔳 Advanced QR Generator
Create professional QR codes with custom styling, analytics tracking, and bulk generation. Supports URLs, WiFi, contact cards, and dynamic content.
🕐 Procrastination Justifier
Scientifically* valid reasons why you should absolutely do that thing tomorrow instead. *Not scientifically valid.
🖼️ Image to Base64 Studio
Convert images to Base64 data URLs for inline CSS & HTML embedding, or decode Base64 strings back into downloadable images.
🖼️ Social Preview Generator
Create perfectly sized Open Graph and Twitter preview images with custom branding, layouts, and auto-generated HTML meta tags.
🖼️ Thumbnail Preview Tool
Upload an image and preview it as a 16:9 thumbnail. Adjust brightness, contrast, and add overlay text.
🖼️ Universal Thumbnail Generator
Generate perfectly sized thumbnails for any platform with advanced editing tools. No upload required - all processing happens locally.
🗣️ Awkward Silence Filler
The silence is deafening. Someone needs to say something. Let us help. (Results may make it worse.)
🗺️ Cartographer's World Forge
Forge an entire fantasy world from a single seed. Tectonic uplift raises mountains, rain shadows carve deserts, rivers find the sea, and civilisations rise where the land is kin…
😈 Petty Revenge Idea Generator
Hilariously harmless revenge ideas for life's minor annoyances. All legal. All petty. All satisfying.
🙃 Professional Excuse Generator
Generate increasingly absurd excuses for any situation. From "plausible" to "they'll never believe you."
🚀 Productivity Score
Calculate and analyze your daily productivity with detailed insights and actionable recommendations. Track progress and optimize your workflow.
🚗 Commute Calculator
Calculate commute time, cost, and environmental impact. Compare different transportation modes. ✅ Tracks daily, weekly, monthly, and yearly totals
🚚 Ultimate Moving Planner
Complete moving organization tool: Create checklists, track inventory, manage budget, schedule tasks, and coordinate with family/friends. Make your move stress-free!
🛎️ Boxing Knockdown & Count Rules Assistant
Work out whether an incident is a scoring knockdown or a slip, how the count runs, and what it does to the round score. Includes a live count timer at the official pace.
🛒 Smart Shopping List
Add items, organize by category, track quantities, and manage your shopping efficiently. ✅ Features: Categories, quantity tracking, budget calculator, shareable lists
🤖 AI Team Hub
AI-powered team management with workload balancing, predictive analytics, and automated optimization. ⚡ Smart suggestions • 🎯 Predictive deadlines • 📊 Real-time analytics
🤖 AI Toolbox Generator
Build your own custom AI tools by combining different AI capabilities. Create, save, and share personalized mini-tools in minutes! ✨ No coding required - drag, drop, and customize!
🤡 Conspiracy Theory Generator
Generate absurd conspiracy theories that are somehow more believable than the real ones.
🥊 Boxing 10-Point Must Scorecard
Score a fight round by round using the official 10-Point Must System. Knockdowns and point deductions are applied automatically, with a live running total and winner projection.
🥘 Pan Size Converter
Convert between different baking pan sizes and adjust recipes. Calculates volume differences and ingredient scaling.
🧠 Quick Quiz Maker
Create a multiple-choice quiz, then test yourself. Questions save to your browser.
🧭 Learning Style Self-Assessment
Answer 8 quick questions to discover your preferred learning style: Visual, Auditory, Reading/Writing, or Kinaesthetic.
🧮 Recipe Ingredient Scaler
Perfectly scale any recipe with smart parsing, automatic unit conversions, and kitchen-tested measurements.
🧮 The Overthinker's Calculator
Calculate exactly how many ways a situation can go wrong. Spoiler: it's more than you think.
🧳 Smart Packing List
Create intelligent packing lists with categories, trip types, weather considerations, and shareable checklists. Never forget an essential item!
🧵 Fabric Yardage Estimator
Pattern envelopes quote fabric for one specific width, and most fabric is not sold in that width. This converts for the width you actually bought, then adds the three allowances…
🧹 Cleaning Schedule
Plan, track, and manage cleaning tasks with smart scheduling. Never forget a chore again!
SaaS & Business Killers 11 tools
⚖️ Contract & NDA Builder
Generate legally-binding Non-Disclosure Agreements (NDA) and Independent Contractor Service Agreements. Customize IP assignment, confidentiality duration, non-solicitation, and…
✉️ B2B Cold Email Generator
Generate high-converting 4-touch B2B cold email sequences. Features real-time spam keyword detection and an inbox deliverability health score. Replaces expensive monthly sales a…
🌟 Testimonial Card Generator
Turn customer reviews, tweets, and testimonials into high-converting social proof cards. Generates pure zero-dependency HTML & CSS code with zero third-party tracking scripts th…
🎨 Social Image Resizer
Crop and export pixel-perfect images for every social media network directly in your browser. 100% client-side HTML5 Canvas with zero server uploads, zero watermarks, and zero m…
💸 Meeting Cost Ticker
Track real-time company salary burn during meetings. Keep discussions focused, respect employee time, and visualize the true cost of every minute.
📈 SaaS LTV & CAC Calculator
Calculate core SaaS unit economics, Customer Lifetime Value (LTV), Customer Acquisition Cost (CAC), payback period, and cash burn runway. Replaces expensive subscription analyti…
📊 Cap Table & Dilution
Model startup equity dilution across funding rounds. Calculates Y Combinator post-money SAFEs, valuation caps, employee option pool (ESOP) expansion, and founder equity value wi…
🔍 SEO Meta Tag Previewer
Generate and preview Open Graph, Twitter Cards, and SEO meta tags in real time. Simulate Google SERP snippets and social media feed cards before deploying. Replaces expensive mo…
🔗 UTM Campaign URL Builder
Generate standardized Google Analytics 4 (GA4) tracking URLs across multiple marketing channels simultaneously. Enforces lowercase slugification, auto-encodes illegal spaces, an…
🛡️ Privacy Policy Generator
Generate legally-compliant Privacy Policies for websites, mobile apps, SaaS, and e-commerce stores. Includes GDPR, CCPA/CPRA, cookie consent, and third-party processor disclosur…
🧾 InvoiceForge Generator
Generate clean, client-ready invoices with zero watermarks. Calculates multi-currency line items, tax, discounts, and payment terms with 1-click browser print to PDF. Instant br…
Science & Engineering 123 tools
Anatomy Tools & Facts
Body Mass Index
Astronomy Calculators
Planets move in elliptical orbits with the Sun at one focus.
Battery Sizing Calculator
Accounts for battery aging, temperature, and discharge limits
Biology Tools
Quick Guide
Boiling Point Finder
Quick Examples:
Capacitor Calculator
Calculate capacitor values, RC time constants, impedance, and filter characteristics. ⚠️ Educational only — verify with datasheets and professional standards.
Evolution AI Walker
Watch AI creatures evolve to walk, survive disasters, find food, and adapt! 10 terrain types, random events, food chains, achievements, and deep genetics. Creatures improve thro…
Geography Helper
Add countries, capitals, and notes to build your geography study list.
Geology Tools & Facts
Explore geology concepts and discover fascinating facts about Earth's structure and processes.
Lab Planner
Plan lab experiments by organizing materials, steps, and timing. Enter details and generate a structured plan.
Lab Safety Tools & Facts
Review lab safety rules and generate reminders for safe scientific work.
Materials Science Tools & Facts
Calculate material properties and explore fascinating facts about metals, polymers, and composites. Uses real material properties from established databases.
Science Quiz Generator
Generate science quiz questions and test your knowledge with fun facts.
☀️ Solar Panel Calculator
Estimate solar panel requirements for your energy needs. Educational tool only — always consult a professional installer.
☁️ Kelvin-Helmholtz Waves
Atmospheric fluid shear-flow instability. Two fluid layers with differing densities and velocities roll up into breaking ocean-billow cloud vortices.
☁️ Psychrometric & Dew Point
Analyze atmospheric water vapor psychrometrics using Magnus-Tetens formulas. Calculate exact Dew Point ($T_{dp}$), saturation vapor pressure ($e_s$), moisture humidity ratio ($W…
☢️ Radioactive Decay Lab
Model exponential nuclear decay, remaining isotope fractions, and radiometric carbon dating via the fundamental decay law $N(t) = N_0 (1/2)^{t / t_{1/2}}$.
⚙️ Four-Bar Mechanism Lab
Synthesize planar four-bar kinematic mechanisms. Classify via Grashof's Theorem ($s + l \le p + q$), trace coupler curves (Chebyshev, Watt, Hoeken), and analyze transmission ang…
⚙️ Steam Tables Lab
Industrial steam table thermodynamics (IAPWS formulation). Calculate saturation pressure ($P_{sat}$), specific enthalpy ($h$), entropy ($s$), specific volume ($v$), and latent h…
⚛️ Periodic Table Explorer
Explore the fundamental building blocks of the universe. Search by name, symbol, or atomic number, filter by chemical series, and inspect atomic mass, electron configuration, an…
⚛️ Quantum Wave Tunneling
Quantum mechanical wavepacket simulator solving the time-dependent Schrödinger equation across an impenetrable classical potential barrier.
⚛️ Science Unit Converter
Convert between scientific units — energy, temperature, length, mass, and pressure.
⚡ Breaker Sizing Calculator
Quick Examples:
⚡ Cable Length & Voltage Drop
Common Scenarios:
⚡ Conduit Sizing Calculator
Calculate conduit sizes based on NEC requirements, wire types, and installation conditions. ⚠️ Disclaimer: For educational purposes. Always consult NEC codebook and licensed ele…
⚡ Damped Oscillator Simulator
Analyze classical mass-spring-damper dynamics ($m\ddot{x} + c\dot{x} + kx = F_0\cos\omega t$). Inspect damping ratios ($\zeta$), Q-factor resonance peaks, phase lag, and transie…
⚡ Earthing Conductor Calculator
For qualified electricians. Always verify with local regulations and manufacturer specifications.
⚡ Electrical Engineering Calculator
🔬 A comprehensive electrical engineering toolkit for professionals and students. Includes circuit analysis, power calculations, and energy conversions with real-world context.
⚡ Electrical Load Calculator
🔧 Professional-grade calculations: Calculate electrical loads for homes, offices, or circuits. Includes NEC compliance tips and safety warnings.
⚡ Energy Consumption Calculator
Calculate electricity costs, carbon footprint, and savings potential for any appliance. Track your energy usage and find ways to save money!
⚡ Inductance Calculator
Professional inductance calculator with real-time visualization, multiple coil types, and comprehensive electrical analysis.
⚡ Lissajous Laser Projector
Dual-galvanometer laser projector simulating orthogonal harmonic oscillations, phase shifts, and phosphorescent persistence curves.
⚡ Logic Gate Simulator
Simulate fundamental boolean logic gates (AND, OR, XOR, NAND) and digital circuits with live voltage probes and dynamic truth tables.
⚡ Motor Startup Calculator
Calculate motor running/starting currents, cable sizing, protection devices, and voltage drop analysis for electrical installations. 🔧 Running current • Starting current • Cable…
⚡ Ohm's Law Calculator
Instant voltage, current, resistance, and power calculations.
⚡ PCB Trace Width Calculator
Estimate minimum PCB trace width for a given current, copper thickness, and temperature rise.
⚡ Power Calculator
Calculate electrical power values with multiple calculation modes. ⚠️ Educational purposes only — consult licensed electrician for actual installations.
⚡ Solar Inverter Sizing
Essential for solar/off-grid setups: Calculate the right inverter size for your needs. Always consult a professional before installation!
⚡ Tesla Atmospheric Plasma
High-frequency Tesla coil discharge globe. Noble gas ionization streamers branch from the central electrode and focus to your touch via capacitive coupling.
⚡ Torsional Vibration Lab
Calculate torsional stiffness ($k_t = \frac{GJ}{L}$), natural angular frequencies ($\omega_n = \sqrt{k_t/I}$), and critical whirling RPM. Analyze engine harmonic orders ($1\time…
⚡ Transformer Sizing Calculator
Estimate transformer size for electrical loads. ⚠️ EDUCATIONAL ONLY — Always verify with a qualified engineer and local standards.
⚡ Van de Graaff Generator
Electrostatic museum exhibit. Rubber belt triboelectric charge transport accumulates up to 400 kV on the metal dome, firing high-voltage atmospheric sparks.
⚡ Voltage Drop Calculator
Estimate voltage drop across a conductor run. Educational only — always verify with a qualified electrician and local standards.
⚡ Water Dielectric Lab
Investigate water's molecular dipole moment ($\mu = 1.854\text{ Debye}$) and huge dielectric permittivity ($\epsilon_r \approx 80.1$). Model Debye relaxation ($\epsilon^*(\omega…
⚡ Wire Gauge Calculator
Professional wire sizing calculator for electrical installations with NEC/IEC compliance checks and safety recommendations.
⚪ Kinetic Momentum Cradle
Conservation of momentum and kinetic energy exhibit. Demonstrates compressive acoustic stress wave transmission across elastic collision chains.
✨ Fiber Optic Light Guide Lab
Total internal reflection fiber optics lab. Explore critical angle guidance, acceptance cone numerical aperture (NA), and macro-bending radiation loss.
〰️ Moiré Optical Interference
Kinetic optical interference exhibit. Overlay geometric optical gratings and rotate them to observe emergent macro-scale moiré superlattices.
🌀 Double Pendulum Chaos
Simulate non-linear Hamiltonian chaos via Lagrangian mechanics solved with 4th-Order Runge-Kutta (RK4). Track sensitive dependence on initial conditions (Butterfly Effect) with…
🌈 Holographic Laser Spectrograph
Optical spectrometer bench. High-density holographic diffraction grating disperses atomic gas emission into discrete quantum spectral fingerprints.
🌈 Prism Optics & Snell's Law
Interactive optical bench simulating chromatic dispersion, Snell's law refraction, and total internal reflection (TIR) through a triangular prism.
🌊 Reynolds Number Simulator
Calculate the dimensionless Reynolds number ($\text{Re} = \frac{\rho v D}{\mu}$) for internal pipe flow and aerodynamics. Visualize laminar streamline transitions into chaotic t…
🌊 Seawater Salinity & Density
Investigate ocean physics and the thermodynamic equation of seawater (TEOS-10). Calculate in-situ density ($\rho$), freezing point depression ($-1.91^\circ\text{C}$), sound spee…
🌊 Soliton Wave Flume Tank
John Scott Russell's 1834 hydrodynamic flume exhibit. Simulates the Korteweg–de Vries (KdV) equation where nonlinear steepening balances dispersion to form permanent solitons.
🌌 Aurora Solar Wind Chamber
Kristian Birkeland's Terrella experiment. Solar wind plasma streams channeled along geomagnetic dipole field lines excite shimmering atmospheric auroral ovals.
🌌 Galaxy Collision & Tidal Tails
Gravitational N-body astrophysical simulation. Watch two disk galaxies collide as differential tidal forces eject long parabolic stellar bridges and tails.
🌌 Solar System Simulator
Interactive 2D simulation of the Solar System. Adjust time speed and scale, toggle orbits and labels, click planets for details.
🌍 Eco Footprint Calculator
Move past vague carbon guilt. PlanetPositive pinpoints the exact 80/20 high-leverage lifestyle actions that slash personal emissions the fastest while saving hundreds of pounds…
🌍 Environmental Science Tools
Calculate environmental impacts, explore sustainability metrics, and learn fascinating facts about Earth's systems. Make informed decisions for a greener planet!
🌍 Foucault Pendulum Spin
Léon Foucault's 1851 Paris Panthéon experiment proving Earth's diurnal rotation. The swing plane stays fixed in inertial space while Earth rotates below.
🌍 Professional Ecology Calculator
🔬 A comprehensive suite of ecological calculations for researchers, environmental scientists, and conservation professionals. Includes statistical analysis, biodiversity metrics…
🌐 Subnet & CIDR Calculator
Calculate IPv4 subnets, network boundaries, usable host ranges, and binary bit allocation. Essential for cloud VPCs, DevOps, and network routing.
🌪️ Fluid Smoke Tunnel
Aerodynamic wind tunnel museum exhibit. Visualize laminar airflow, von Kármán vortex shedding, and lift/drag forces around aerodynamic obstacles.
🌫️ Wilson Cloud Chamber
Supersaturated alcohol vapor chamber detecting cosmic muons and subatomic radioactive decay tracks via ion-nucleated condensation.
🌱 Seed Germination Calculator
Predict germination time based on seed type, temperature, and environmental factors using USDA, UC Davis, and university research data. This tool is supported by user contributi…
🌱 Soil & pH Guide
Soil pH and type determine nutrient availability and plant success. Match plants with their preferred conditions. This tool is supported by user contributions .
🌿 Plant Encyclopedia (Live)
Comprehensive plant database with real-time data from multiple sources. Search for any plant to get detailed information.
🎈 Coanda & Bernoulli Air Levitation
Aerodynamic levitation exhibit. High-velocity air jet traps a floating sphere via Bernoulli low-pressure depression and Coandă wall adhesion even when tilted.
🎛️ Coupled Oscillators Lab
Simulate multi-degree-of-freedom coupled mechanical oscillators. Observe symmetric ($\omega_1$) vs anti-symmetric ($\omega_2$) normal modes and cyclic mechanical energy sloshing…
🎨 Color Palette Extractor
Generate algorithmic color harmonies (Complementary, Triadic, Analogous, Split) and verify accessibility with real-time WCAG 2.1 AA/AAA contrast ratio verification.
🎨 Resistor Color Code
Decode resistor color bands into resistance values. ⚠️ Educational only — verify with multimeter.
🎯 Projectile Motion Simulator
Simulate parabolic ballistic trajectories in real time across different planetary gravitational fields. Computes flight time, apex altitude, total ground range, and impact veloc…
🏔️ Water Phase Diagram Lab
Navigate water's complete thermodynamic $P$-$T$ phase space across Solid, Liquid, Vapor, and Supercritical regimes. Explore the Triple Point ($0.01^\circ\text{C}, 611.65\text{ P…
🏗️ Beam Vibration Analyzer
Compute natural flexural vibration eigenfrequencies and mode shapes for structural beams ($EI \frac{\partial^4 w}{\partial x^4} + \rho A \frac{\partial^2 w}{\partial t^2} = 0$).…
🐆 Turing Reaction Diffusion
Alan Turing's 1952 morphogenesis simulator. Nonlinear chemical reaction-diffusion equations generating biological spots, stripes, and coral textures.
🐬 Underwater Acoustics Lab
Investigate acoustic wave mechanics in water. Calculate high-precision sound velocity ($c \approx 1,482\text{ m/s}$, 4.3× faster than air), bulk modulus incompressibility ($K_s…
💡 Lighting Design Calculator
Professional lighting design calculator with comprehensive room analysis, fixture selection, and energy efficiency recommendations. ⚠️ Educational tool — consult certified light…
💧 Faraday Fluid Waves
Simulate Michael Faraday's 1831 parametric liquid surface waves ($\omega^2 = [gk + \frac{\sigma}{\rho}k^3]\tanh kh$). Observe subharmonic resonance ($f_{wave} = f_0/2$) and patt…
💧 Water Density Anomaly Lab
Investigate water's famous thermodynamic density anomaly ($\rho_{max}$ at $3.98^\circ\text{C}$). Explore negative thermal expansion, the $+9\%$ ice phase transition volume expan…
📏 Everyday Unit Converter
Convert between common units of length, weight, and temperature.
📐 Aspect Ratio Resizer
Calculate pixel dimensions while locking exact aspect ratios (16:9 widescreen, 9:16 vertical TikTok/Shorts, 4:3 classic, 1:1 square, 21:9 cinema). Generates modern CSS `aspect-r…
📐 Chladni Cymatics Plate
Explore Ernst Chladni's 1787 acoustic nodal resonance figures. Observe sand grains scatter away from high-amplitude vibrating antinodes and crystallize into intricate geometric…
📚 Electrical Standards Guide
📋 Copy Full Report 💾 Save as PDF // Global Electrical Standards Reference let currentRegion = 'iec'; const standardsData = { iec: { name: "International Electrotechnical Commiss…
📡 Oscilloscope Visualizer
Visualize and analyze waveforms in real-time. Generate signals, adjust parameters, and explore waveforms.
📷 Exposure, Depth of Field & Filter Lab
Four things photographers work out in their heads and get wrong under pressure: what shutter speed balances a change of aperture, how long an ND filter needs, how much of the fr…
🔄 Universal Unit Matrix
High-precision bidirectional converter across engineering, data storage, scientific physics, and everyday measurements.
🔉 3D Cymatic Sound Sculpture
Acoustic resonance installation. Granular silica particles migrate across a vibrating resonant Chladni plate into standing wave geometric nodal lines.
🔊 Doppler Effect Simulator
Simulate frequency shifts and wavefront compression for acoustic sound waves and relativistic light redshift ($z$). Features real-time wavefront propagation canvas and Web Audio…
🔊 Sound Decibel Calculator
Calculate sound pressure level (SPL dB) drop over distance using the acoustic inverse-square law $L_2 = L_1 - 20\log_{10}(r_2/r_1)$, acoustic pressure in Pascals, and NIOSH/OSHA…
🔊 Ultrasonic Acoustic Levitation
40 kHz ultrasonic standing wave acoustic trap. Non-contact levitation of micro-beads and liquid droplets suspended in mid-air at acoustic pressure nodes.
🔌 Circuit Calculator
Calculate circuit load, breaker size, and wire sizing. Perfect for DIY projects and planning.
🔥 Firefly Kuramoto Synchronization
Yoshiki Kuramoto's nonlinear synchronization model. Independent bioluminescent fireflies spontaneously phase-lock into simultaneous collective pulsing.
🔥 Melting Point Explorer
Explore melting points of hundreds of substances. Compare materials, convert units, and learn about phase changes.
🔥 Schlieren Optics Airflow
August Toepler's 1864 Schlieren photography system. Visualizes invisible thermal convection plumes and supersonic shockwaves via refractive index gradients.
🔥 Thermodynamics Calculator
Calculate heat transfer, efficiency, entropy, and explore thermodynamics principles. Essential tool for physics, engineering, and chemistry.
🔨 Virtual Builder's Workmate
Virtual measurement and leveling tools using device sensors. Requires camera and motion sensor permissions.
🔬 Microbiology Tools & Facts
Calculate essential microbiology values and explore fascinating facts about the invisible world of microbes. 🧫 Growth rates • Dilutions • Microbial facts • Educational insights
🔬 Optical Tweezers & Trapping
Arthur Ashkin's 2018 Nobel Prize optical trap. Focused Gaussian laser beam gradient forces trap micro-particles and counter thermal Brownian diffusion.
🔬 Optics Calculator & Explorer
Calculate optical properties, simulate light behavior, and explore fascinating physics of light.
🔬 Physics Toolkit
Calculate common physics formulas: motion, forces, energy, and more. Select a formula to begin.
🔬 Quantum Energy Calculator
Calculate electromagnetic photon energy ($E = h\nu = hc/\lambda$), momentum ($p = h/\lambda$), and matter wave de Broglie wavelengths across the entire electromagnetic radiation…
🔬 Quantum Eraser & Double Slit
Quantum optics delayed-choice experiment. Observe wave interference, wavefunction collapse via which-way detectors, and quantum erasure recovery.
🔬 Science Experiment Generator
Generate creative, hands-on science experiment ideas for all ages. Perfect for students, teachers, and curious minds!
🔬 Science Study List
Build your science study list. Add topics and notes, then test yourself by hiding the notes. Saved locally in your browser.
🔬 Scientific Method Helper
Work through the scientific method. Enter your experiment idea and generate a structured outline.
🔬 Scientific Unit Converter
Convert between common scientific units — length, mass, temperature, and energy.
🕰️ Pendulum Wave Array
Kinetic museum wave array. Independent pendulums with calibrated lengths execute serpentine traveling waves, choreographing standing waves and unified reconstitution.
🕳️ Gravitational Lensing Lab
General Relativity astrophysics exhibit. Drag a supermassive Schwarzschild black hole across cosmic starfields to observe Einstein rings and photon deflection.
🚀 Special Relativity Simulator
Calculate relativistic time dilation, length contraction, and kinetic energy via Einstein's Special Relativity equations. Compare spaceship crew time against stationary observer…
🚰 Water Hardness (LSI) Lab
Assess water hardness and mineral stability using the Langelier Saturation Index ($\text{LSI} = \text{pH} - \text{pH}_s$) and Ryznar Stability Index ($\text{RSI}$). Predict calc…
🚴 Bike Gear, Cadence & Speed Calculator
Works out what every gear on your bike actually does — how far one pedal turn takes you, what speed you will be doing at a given cadence, and which gears are duplicates you neve…
🛡️ Vibration Isolator Designer
Design mechanical vibration isolators and shock mounts using force transmissibility ($T_R$). Calculate required static deflection ($\delta_{st}$), isolation efficiency ($\eta$),…
🛰️ Orbital Mechanics Lab
Calculate orbital velocity, Keplerian period, and gravitational escape speed around celestial bodies. Analyze Low Earth Orbit, GPS altitudes, and Geostationary synchronization.
🛸 TR-3B Flight Simulator
Simulate the theoretical physics of the triangular TR-3B aerospace platform. Calculates Mercury-based Magnetic Field Disruptor (MFD) plasma acceleration, inertial mass reduction…
🥾 Hike & Walk Time Planner
Built on Naismith's Rule, the estimate mountain rescue has used for a century: allow an hour for every 5 km, plus a minute for every 10 m climbed. Then it adds the two things th…
🧪 Solution Dilution Lab
Precision wet-lab chemistry solver for serial dilutions ($C_1 V_1 = C_2 V_2$) and molarity-to-mass conversions ($\text{Mass} = M \times V \times \text{MW}$) with step-by-step be…
🧪 Water Ionization & pH Lab
Investigate water's auto-protolysis equilibrium ($2\text{H}_2\text{O} \rightleftharpoons \text{H}_3\text{O}^+ + \text{OH}^-$). Discover why neutral water is $\text{pH } 7.00$ on…
🧪 Water Surface Tension Lab
Explore water's extraordinary cohesive hydrogen-bond surface tension ($\sigma = 72.86\text{ mN/m}$). Calculate Jurin's Law capillary rise ($h = \frac{2\sigma\cos\theta}{\rho g r…
🧬 Genetics Laboratory
Explore genetics through interactive simulations, DNA analysis tools, and educational content. Perfect for students and enthusiasts!
🧭 Chaotic Magnetic Pendulum
Nonlinear chaos theory exhibit. A metallic pendulum swings over three magnetic attractors, demonstrating sensitive dependence on initial conditions.
🧭 Gyroscopic Precession Lab
Explore rigid body rotational mechanics ($\boldsymbol{\tau} = \boldsymbol{\Omega}_p \times \mathbf{L}$). Calculate steady precession velocity ($\Omega_p = \frac{mgr}{I_z \omega_…
🧲 Ferrofluid Spiking Lab
Rosensweig normal-field magnetic instability simulator. Superparamagnetic liquid self-organizes into conical spikes balancing surface tension and magnetic stress.
🧲 Superconductor Flux Pinning
Type-II high-temperature superconductor cryogenic lab. Explore Meissner effect magnetic field expulsion and quantum flux pinning levitation.
Virtual Worlds & Gaming 7 tools
🏗️ Second Life Builder's Mate
Professional toolkit for Second Life builders: prim allowance, object sizing, weight calculation, grid alignment, and LOD optimization. ✅ Features: Prim/LI calculation, mesh opt…
💰 Linden Dollar Exchange
Convert Linden Dollars (Second Life virtual currency) to real-world currencies using market rates. Rates are estimates — actual exchange rates may vary.
📅 Live Second Life Events
🟢 LIVE Real-time events from Second Life. Updates automatically.
📚 Second Life Surnames Encyclopedia
Explore the rich tapestry of Second Life surnames. Discover origins, cultural associations, and roleplay inspiration. A living encyclopedia with search, filters, and favorite tr…
🖼️ Second Life Texture Tool
Calculate texture repeats, offsets, and rotations for Second Life prims. Perfect alignment for builders and creators. Works with any texture and prim size. This site is supporte…
🗺️ Second Life Region Map
View Second Life region maps with interactive pan/zoom, coordinates, and debugging tools. Uses multiple data sources with automatic fallback.
🛒 Second Life Marketplace Search
Search and browse Second Life Marketplace items. Demo data shown — in production, connect to actual Marketplace API.
Wellbeing & Community 10 tools
♿ Accessible Text Prep
Paste something you need a specific person to understand — a letter from a council, instructions for an elderly relative, a form your colleague keeps skipping. This rewrites the…
🏘️ Street Sharing Planner
Neighbourly sharing usually fails for two unglamorous reasons: nobody wants to be the one who knocks on a door first, and nobody knows who has what. This builds the sheet and wr…
💬 Difficult Conversation Scripter
Builds you the words for a conversation you have been putting off. Nothing is sent anywhere — this works offline and nothing you type leaves your device.
📖 Plain Language Decoder
Paste a letter, contract clause, medical note or official notice and get it back in ordinary English, with the obligations and deadlines pulled out separately. Runs entirely on…
🕯️ Grief Companion
There is nothing to fix here, and nothing you are supposed to be over by now. What this does is help with the two things grief actually makes hard: getting through an ordinary d…
🚨 Household Emergency Plan
Fill this in once on a calm afternoon and it turns a frightening night into a set of steps everyone already knows. It stays on your device, and you can print or copy it to stick…
🛡️ Scam Sense Checker
Paste a text, email or message and see which warning signs it contains. Everything is analysed on your own device — the message is never uploaded, which matters because pasting…
🤝 Sincere Apology Builder
Most apologies fail for one of four reasons: they contain “but”, they apologise for the other person’s feelings instead of your behaviour, they explain rather…
🫁 Grounding & Breathing Coach
For the moments when your body has decided there is an emergency and your head knows there is not one. Nothing here needs signing up to, nothing is recorded, and it works offlin…
🫂 Carer's Respite Planner
Most carers never get a break, and it is rarely because nobody wants to help. It is because the carer is the only person who knows what needs doing. This turns what is in your h…
Writing & Language 47 tools
AI-Style Summary Generator
AI-Style Summary Generator Generate intelligent summaries using advanced text analysis algorithms
Business Writing Assistant
Draft clear, professional business documents: memos, executive summaries, proposals, and meeting notes. Choose the document type, enter the purpose and key points, then generate…
Creative Writing
Instant, free online Creative Writing tool. No signup required.
Grammar Proofreader ✍️
Check text for grammar, spelling, punctuation, and style issues. Get suggestions and explanations to improve your writing.
Languages Tool
Translate words, check meanings, and practice languages. Uses open-source translation services.
Vocabulary Trainer
Add words with definitions and examples, practise with flashcards or quick quizzes, and track progress with simple Leitner boxes. Data is stored locally in this card.
⚡ Japanese Verb Conjugator
Instantly conjugate any Japanese verb across all core grammatical forms (Present, Negative, Past, Te-form, Potential, Volitional, and Passive) with group detection (Godan, Ichid…
⚡ Regex Tester & Explainer
Test, debug, and understand regular expressions in real-time. Features live match highlighting, capture group extraction, and a built-in library of common production patterns.
⚡ Regex Transform Studio
Search, replace, extract capture groups, and batch-transform text with real-time regular expression pattern matching.
✍️ Cover Letter Builder
PROFESSIONAL TOOL - Create tailored cover letters with industry-specific templates, ATS optimization, and professional tone analysis. Used by career coaches worldwide.
✍️ Proofreading & Style Checker
Advanced text analysis for grammar, style, readability, and clarity. Get detailed suggestions with explanations.
✍️ SEO Writing Assistant
Optimize text for search engines. Paste your draft, choose focus keywords, and get suggestions for keyword density, headings, meta description, and readability improvements.
🇨🇳 Chinese Tones & Pinyin
Conquer the 4 tonal contours of Mandarin Chinese (High Flat, Rising, Dipping, Falling) and explore foundational HSK 1 vocabulary with native Mandarin speech audio (`zh-CN`).
🇩🇪 German Cases & Gender
Conquer the 4 German grammatical cases (Nominativ, Akkusativ, Dativ, Genitiv) and understand exactly how der, die, das shift based on subject, direct object, indirect recipient,…
🇪🇸 Spanish Verb Conjugator
Master Spanish verb conjugations, conquer the notorious Ser vs Estar dilemma (permanent essence vs temporary state), and master Por vs Para with native Spanish audio playback.
🇫🇷 French Verbs & Pronunciation
Master the most critical French irregular verbs (être, avoir, aller, faire) and unlock fluent French pronunciation with our guide to silent consonants and natural liaisons.
🇰🇷 Korean Hangul Trainer
Learn Hangul (한글), the world's most scientific writing system. Explore the 14 basic consonants, 10 vowels, and combine them into complete Korean syllable blocks with native audi…
🌍 Translation Helper
Translate text between languages with style and tone analysis. Includes language detection and clarity checking!
🌐 10-Language Phrasebook
Compare, learn, and pronounce essential survival phrases side-by-side across 10 of the world's most spoken languages with instant native audio speech synthesis.
🎌 Japanese Kana Trainer
Master the foundation of Japanese. Interactive 46-character syllabaries for both Hiragana and Katakana with native audio pronunciation, dakuten/handakuten sound changes, and a s…
🎌 Japanese Kanji Helper
Learn, practice, and master Japanese kanji with REAL stroke order animations, meanings, readings, and example words.
🎤 Public Speaking Coach
Improve your speeches with AI-powered analysis, practice tools, and personalized feedback. Practice timing, structure, delivery, and confidence.
🎭 Meme Translator
The ultimate internet language decoder. Translate memes, slang, acronyms, and internet speak with context, origins, and examples. 🌐 Real-time translation across internet cultures
👑 Japanese Keigo Master
Navigate the 3 crucial Japanese speech registers: Casual (with friends), Teineigo (everyday polite), Sonkeigo (honorific/clients), and Kenjougo (humble/self-lowering).
💬 LLM Prompt Token Counter
Estimate LLM token usage, calculate API cost per query, and compress prompt text to eliminate token waste and latency.
📄 Markdown Document Forge
Transform raw Markdown into publication-ready corporate memos, academic whitepapers, and printable PDFs with 1-click browser export.
📄 Resume Builder
Create and preview a professional resume. Generates clean, printable format.
📊 Readability Analyzer
Analyze text readability with multiple scoring systems. Get actionable insights to improve your writing for any audience. Supports 8+ readability formulas with visual feedback!
📖 JLPT Vocabulary Studio
Supercharge your Japanese vocabulary for the JLPT N5 and N4 examinations. Includes native audio pronunciation, Furigana reading toggles, English definitions, and contextual exam…
📚 AI Literature Analyzer
🚀 Ultimate literary toolkit: Analyze any text AND generate study materials. Perfect for students, teachers, and book lovers.
📚 Citation Generator
Generate perfectly formatted citations in APA, MLA, or Chicago style. Supports multiple authors, websites, and academic sources.
📚 Reading Time Calculator
Calculate precise reading time estimates with multiple input methods, audience presets, and detailed breakdowns. Perfect for writers, editors, and content creators!
📝 Essay Writing Assistant
Generate structured essay outlines, starter paragraphs, and writing guidance for any topic. Perfect for students, writers, and professionals!
📝 Markdown Live Editor
Write, preview, and format Markdown in real-time. Features instant HTML rendering, live word & reading time analytics, syntax quick-tags, and 1-click export to Markdown or HTML.
📝 Punctuation Mastery Guide
Master the art of punctuation with this comprehensive guide. Learn rules, see examples, and test your knowledge. Perfect for writers, students, and professionals!
📝 Word List Flashcards
Instant, free online Word List Flashcards tool. No signup required.
📡 Morse Code Translator
Translate English text into International Morse Code and vice-versa. Features live Web Audio acoustic dot/dash tone synthesis and synchronized visual optical transmission.
📧 Email Template Generator
💼 Generate perfectly crafted professional emails, LinkedIn messages, and business communications. Includes tone analysis, etiquette tips, and productivity features.
🔄 Romaji & Kana Converter
Type in standard alphabet (Romaji) and watch it convert in real-time into Hiragana and Katakana. Also translates Kana back into Hepburn Romaji with 1-click text-to-speech audio…
🔍 Cognitive Bias Detector
Interrogate any argument, news headline, debate talking point, or internal decision. TruthLens scans text against 24 universal cognitive biases and logical fallacies to sharpen…
🔍 Plagiarism Checker
Check text for originality and similarity with common phrases. Local processing only — no data sent online.
🔍 SEO & Content Optimizer
Professional SEO analysis, optimization, and content planning. Get actionable insights and comprehensive reports.
🔍 Smart Spelling Checker
Advanced spelling checker using multiple open-source dictionary APIs combined for maximum accuracy. ⚠️ Requires internet connection for online dictionary checks.
🔢 Japanese Counters & Numbers
Conquer Japanese counter words (助数詞 - Josūshi). In Japanese, you cannot simply say "three beers" or "two cats"—objects require specific counters with euphonic sound shifts (rend…
🧠 AI Study Assistant
🚀 Ace your exams: Transform any topic into flashcards, practice quizzes, study guides, and mnemonics. Perfect for students, lifelong learners, and professionals.
🧩 Japanese Particles Master
Master the grammatical glue of Japanese sentences (助詞 - Joshi). Practice tricky distinctions like は vs が (topic vs subject) and に vs で (time/target vs location of action) with i…
🧭 Argument Mapper
Structure an essay or debate case before you write it. Lay out your thesis, the premises supporting it and the strongest objections, then score how well each one actually holds up.