Everything on this site

🏠 Home

The main interactive catalogue — search, filter, view directory mode.

↗

⭐ Most popular

60 hand-curated most-useful tools, organised by category.

↗

🆕 Just added

The 10 newest tools added in the latest catalogue audit.

↗

📚 Full index

The complete alphabetical-by-category index of all 1165 tools.

↗

🎯 By use case

Find the right tool by describing the problem, not the name.

↗

🔌 Embed

Every tool embeddable in one iframe. Copy the snippet and paste it anywhere.

↗

ℹ️ About

Who built it, why, the principles behind the design.

↗

📰 Press

One-paragraph factsheet, story angles, contact, and brand assets.

↗

❓ Help & FAQ

20 most-asked questions, with honest answers.

↗

📜 Changelog

Every change to the site, in order, with dates and tags.

↗

☕ Donate

Support the project. The tools stay free either way.

↗

🤝 Sponsor

Underwrite a specific tool or category for ongoing maintenance.

↗

🎧 MrProphecy music

The companion product: UK hip-hop and animated soundscapes.

↗

🎵 Music library

The full music catalogue, embedded player, and lyrics.

↗

📖 Blog

Long-form, math-honest guides to the things the tools calculate.

↗

🇮🇳 हिन्दी (Hindi)

↗

🇮🇳 मराठी (Marathi)

↗

🇮🇳 বাংলা (Bengali)

↗

🇮🇳 ਪੰਜਾਬੀ (Punjabi)

↗

🇨🇳 中文 (Chinese)

↗

🇳🇱 Nederlands (Dutch)

↗

🇫🇷 Français (French)

↗

🇯🇵 日本語 (Japanese)

↗

🇵🇹 Português (Portuguese)

↗

🇷🇺 Русский (Russian)

↗

🇪🇸 Español (Spanish)

↗

🇹🇭 ไทย (Thai)

↗

🙈 .gitignore Builder

🔀 .htaccess Redirect Generator

🌐 10-Language Phrasebook

🔉 3D Cymatic Sound Sculpture

📐 3D Function Plotter

🪐 3D Solar System Orrery

🌀 3D Spirograph Nebula

🥃 ABV, Proof & Dilution

♿ Accessible Text Prep

🌾 Acres ⇄ Hectares ⇄ m²

💆 Acupressure Point Relief Map

🌱 Adaptogen Synergy Matcher

🏠 Adulting Score Calculator

📜 Advanced History Timeline Builder

🏠 Advanced Household Chore Tracker

🧮 Advanced Number Theory Toolkit

🎨 Advanced Palette Swapper

📊 Advanced Percentages Explorer

🔳 Advanced QR Generator

⏱️ Advanced Timer & Stopwatch

✨ Aesthetic Bio Generator

🎨 Aesthetic Color Palette Generator

🎂 Age Calculator

🔄 AI Agent ReAct Loop Studio

🧠 AI Chain-of-Thought Parser

📊 AI Context Window Budget Lab

🧮 AI Differential Equations Solver

⚡ AI Few-Shot Prompt Builder

🤖 AI Function Calling Validator

🔍 AI Hallucination & Fact Check

📚 AI Literature Analyzer

🔌 AI MCP Tool Protocol Inspector

💰 AI Model Cost & Speed Matrix

🛡️ AI Prompt Injection Defense

⚡ AI Prompt Studio

🧠 AI Study Assistant

🤖 AI Team Hub

🤖 AI Toolbox Generator

📐 AI Vector Similarity Matrix

🌬️ Air Fryer ⇄ Oven Converter

🌫️ Airmass & Extinction Calculator

🔤 Anagram Solver

🐫 Ancient Egypt Quiz

⏱️ Anime Binge Calculator

👑 Anime Character Archetypes

🎪 Anime Con Budget Planner

📜 Anime Filler Guide

🔮 Anime Mood Matcher

🎵 Anime Music BPM Analyzer

🎌 Anime Phrases & Tropes

🕒 Anime Schedule Converter

🕳️ Antipode & Gravity Tunnel Explorer

🏦 APR ⇄ APY Converter

🫧 Aquarium CO₂ Calculator

🌡️ Aquarium Heater & Chiller

💡 Aquarium PAR Lighting

🪨 Aquarium Substrate Estimator

🌊 Aquarium Volume & Weight

🎯 Archery Score Calculator

🧭 Argument Mapper

🔤 ASCII Banner Generator

📐 Aspect Ratio Resizer

🥇 Athletics Decathlon & Heptathlon Points

🎧 Audio File Size

🎚️ Audio Tone Generator

🌌 Aurora Solar Wind Chamber

🔍 Avian Anatomy & Field Marks

🗣️ Awkward Silence Filler

✉️ B2B Cold Email Generator

🍼 Baby Formula Mixing

🍼 Baby Sleep & Feeding Day Planner

🎲 Backgammon

🌻 Backyard Bird Feeder Nutrition

🏸 Badminton Match Scorer

✉️ Bank Charge Dispute Letter Generator

📅 Bank Complaint Deadline Tracker

🔄 Bank Switching Bonus Calculator

⏲️ Bar ⇄ PSI ⇄ kPa

📊 Barcode Check Digit Validator

🌿 Barnsley Fern

🔤 Base64 Text & File Encoder / Decoder

🔐 Base64, Hex & Binary Text Encoder / Decoder

⚾ Baseball Stats Calculator

🐚 Bash Script Builder

🏀 Basketball Efficiency Calculator

🔋 Battery Runtime (mAh)

🏗️ Beam Vibration Analyzer

🥁 Beat BPM Tapper

🌬️ Beaufort Wind Scale

🎰 Betting Odds & Each-Way Calculator

🦋 Bifurcation: Order to Chaos

📈 Big-O Complexity Explorer

🚴 Bike Gear, Cadence & Speed Calculator

🔢 Binary, Bits & Bitwise Playground

🧠 Binaural Neuro Tuner

🔭 Binocular Optics & FOV Lab

🦠 Bioma Petri Dish

🪶 Bird Molt Cycle & Ageing Lab

🪺 Bird Nest Box Dimensions Guide

🎶 Bird Song Mnemonic Trainer

📋 Birding Life List & Big Year

🕳️ Black Hole Horizon Calculator

💢 Blame Deflector 3000

🩺 Blood Pressure Category Guide

⚕️ BMI Calculator

🔥 BMR & TDEE Calculator

🪵 Board-Foot Lumber Calculator

🧠 BODMAS Step-by-Step Trainer

🏋️ Body Fat Calculator

🧍 Body Surface Area Calculator

🧗 Bouldering Score Comparison

🏀 Bouncy Ball Box

🥊 Boxing 10-Point Must Scorecard

📊 Boxing Fight Outcome Projector

⚖️ Boxing Judging Criteria Weigher

🛎️ Boxing Knockdown & Count Rules Assistant

📈 Boxing Momentum & Swing Round Analyser

👊 Boxing Punch Stat Tracker

🔔 Boxing Round Timer & Bell

🔍 Boxing Scorecard Comparator

👨‍⚖️ Boxing Three-Judge Decision Simulator

⚖️ Boxing Weight Class & Weigh-In Checker

🎀 Bra Size Converter

🔵 Braille Alphabet Trainer

✒️ Brand Mark Forge

⚡ Breaker Sizing Calculator

🧱 Brick Calculator

👑 British Monarchs Quiz

🫧 Bubble Wrap Popper

🎲 Buffon's Needle π

💳 Business Card Size Guide

📅 Business Days Calculator

🧩 Business Model Canvas

💾 Bytes ⇄ KB ⇄ MB ⇄ GB

🧳 Cabin Bag Size Checker

⚡ Cable Length & Voltage Drop

📈 CAGR — Compound Annual Growth

📉 Calorie Deficit Timeline

🍬 Candy & Sugar Stages Guide

🥩 Canine Daily Calorie Portioner

📊 Cap Table & Dilution

🎸 Capo Calculator

📱 Caption Generator

🚗 Car Care & MOT Due-Date Tracker

🚗 Car Ownership Cost Calculator (UK)

🫂 Carer's Respite Planner

🗺️ Cartographer's World Forge

🔤 Case Converter

🏃 Cash Runway Planner

🏹 Catapult Simulator

🔲 Cellular Automata Explorer

🌡️ Celsius ⇄ Fahrenheit ⇄ Kelvin

🌐 Censorship Monitor

🧭 Chaotic Magnetic Pendulum

🔴⚫ Checkers / Draughts

♟️ Chess

♟️ Chess Elo Rating Calculator

🇨🇳 Chinese Tones & Pinyin

📐 Chladni Cymatics Plate

🔒 chmod Permission Calculator

🍫 Chocolate Tempering Curves

🎵 Chord Finder

🎼 Chord Progression Builder

🎄 Christmas Card Maker

🎵 Christmas Carol Karaoke Machine

🎄 Christmas Countdown

💰 Christmas Gift Budget Planner

🌿 ChronoGarden Terrarium

🎼 Circle of Fifths Explorer

🔌 Circuit Calculator

📚 Citation Generator

🔐 Classical Cipher Suite

🧹 Cleaning Schedule

🧗 Climbing Anchor Force & Fall Factor Calculator

📋 Clipboard History

🎬 Clip‑to‑Shorts Repackager

🕐 Clock Angle Calculator

🕰️ Clock Reading & Telling Time Trainer

👕 Clothing Size Converter

🎈 Coanda & Bernoulli Air Levitation

🧥 Coat, Hoodie, or Regret?

☕ Coffee Brew Ratio & TDS Lab

🔍 Cognitive Bias Detector

🔮 Coincidence Finder & Synchronicity Tracker

🍯 Cold & Flu Botanical Guide

🌊 Cold Water, Ice & Drowning Rescue

🎨 Color Contrast Checker

🎨 Color Converter & Palette Harmony Studio

🎨 Color Palette Extractor

🎨 Color Picker & Converter

🎨 Colour Converter HEX RGB HSL

🎨 Colour Harmony Palette

🎨 Colour Picker & HEX / RGB / HSL Converter

✏️ Common English Mistakes Trainer

🚗 Commute Calculator

🧭 Compass Bearings Trainer

🧮 Complex Numbers Calculator

💰 Compound Interest Calculator

💰 Compound Interest Growth Visualiser

🧱 Concrete Mix Calculator

⚡ Conduit Sizing Calculator

🔴⚫ Connect Four

🤡 Conspiracy Theory Generator

⭐ Constellation Map

✨ Constellation Weaver

⚖️ Contract & NDA Builder

🧬 Conway's Game of Life

⏱️ Cooking Time Adjuster

🥄 Cooking Unit Converter

🧭 Coordinate Format Translator

📈 Coordinates Trainer

🎯 Corporate Meeting Bingo

🌐 CORS Header Builder

🗡️ Cosplay Prop Scaler

🛒 Cost-Per-Use: Should You Buy It?

⏳ Countdown Timer & Stopwatch with Laps

🌍 Country Data Visualizer

🚩 Country Flags Quiz

🎛️ Coupled Oscillators Lab

✍️ Cover Letter Builder

💳 Credit Card Calculator

📊 Credit Score Dispute Letter Generator

🏏 Cricket Net Run Rate Calculator

🏏 Cricket Run-Chase Calculator

🆘 Crisis Triage Guide

⏰ Cron Expression Builder

⏰ Cron Expression Builder

⏱️ Cron Schedule Builder

🖼️ Crop Factor & 35 mm Equivalent

🔐 Crypto & Hash Suite

✨ CSS Animation Generator

🔘 CSS Border Radius Generator

🌑 CSS Box Shadow Generator

🎛️ CSS Filter Generator

↔️ CSS Flexbox Playground

🎨 CSS Glass & Gradients

🔲 CSS Grid Layout Generator

📐 CSS Grid Playground

🎯 CSS Specificity Calculator

📊 CSV Data Studio

📊 CSV ↔ JSON Converter

⇄ CSV ⇄ JSON

📊 CSV ⇄ JSON ⇄ Markdown Table Converter

〰️ Cubic Bézier Easing

✨ Curiosity Fact Deck

🖥️ cURL Command Builder

🥌 Curling Score Calculator

💱 Currency Converter

🚴 Cycling Power & Speed Calculator

💧 Daily Hydration Calculator

🥩 Daily Protein Intake

💧 Daily Water Intake Calculator

💧 Damp & Mould Diagnostic (UK homes)

⚡ Damped Oscillator Simulator

🌌 Dark Sky Quality Planner

🎯 Darts 501 Average & Leg Tracker

🎯 Darts Checkout Calculator

📅 Date Calculator

🌞 Daylight & Twilight Atlas

💰 Debt Payoff Calculator

⚖️ Decision Matrix Scorer

🎞️ Deck Forge

🪵 Deck Joist Span & Footing Calculator

🪵 Decking Calculator

⏱️ Deep Focus Timer

📸 Deep Sky Exposure Planner

🏛️ Deep Time Museum

🎛️ Delay Time BPM Calculator

💧 Dew Point Calculator

🎲 Dice & Coin Roller

🎲 Diceware Passphrase

💬 Difficult Conversation Scripter

📦 Dimensional Weight Calculator

📐 Dimensions of Reality

🧮 Discrete Math Toolkit

💾 Disk Space Analyzer & Planner

📈 Dividend Yield Calculator

🤸 Diving Score Calculator

🧬 DNA Helix 3D Builder

🧬 DNA → Protein Translator

🍫 Dog Chocolate Toxicity Calc

🎯 Dog Clicker Trainer & Sound

🏠 Dog Crate Sizing & Den Guide

🦮 Dog Daily Walk & Activity Calc

🥩 Dog Food Safety & Toxicity Key

🐕 Dog Human Years Age Clock

🐕 Dog Photo Viewer

📯 Dog Ultrasonic Whistle Lab

🩺 Dog Vital Signs & Hydration

🀄 Domino Chain Reaction

🁣 Dominoes

🔊 Doppler Effect Simulator

🌀 Double Pendulum Chaos

💡 Downlight Spacing Calculator

⬇️ Download Time Calculator

🐦 Drinking Bird

🚗 Driving Emergency Survival Guide

🧱 Drywall (Plasterboard) Calculator

🧹 Duplicate Line Remover

🎵 Ear Trainer

🌙 Earth Tide Clock

⚡ Earthing Conductor Calculator

🫨 Earthquake Seismograph Lab

🌊 EchoPond Cymatics

🌍 Eco Footprint Calculator

⚡ Electrical Engineering Calculator

⚡ Electrical Load Calculator

📚 Electrical Standards Guide

✉️ Email Subject Line Tester

📧 Email Template Generator

🌀 Emergence — Simple Rules, Infinite Complexity

📡 Emergency Communications & Radio Planner

👥 Employee True Cost Calculator

⚡ Energy Consumption Calculator

⚡ Energy Tariff Comparator

🛠️ Engine Displacement

🔄 Entropy & The Arrow of Time

🌍 Environmental Science Tools

📐 Equation Solver

🧭 Equatorial Coordinate Finder

⛰️ Erosion & Landscape Lab

📝 Essay Writing Assistant

💧 Essential Oil Dilution Calc

⚡ Euler's Identity: e^{iπ} = −1

🔌 EV Charging Cost & Time

🎒 Evacuation & Go-Bag Planner

📅 Event Reminder

📏 Everyday Unit Converter

🧬 Evolution Arena — 3D Creature Evolution

🎂 Exact Age Calculator

🎂 Exact Age Calculator (Years, Months, Days)

🎯 Exam & Study Planner

📚 Exam Prep - Mathematics

⚡ Exponents & Roots Calculator

📷 Exposure, Depth of Field & Filter Lab

✏️ Extruded 3D Text Studio

🔭 Eyepiece & Magnification Calculator

🏁 F1 Championship Points Calculator

🧵 Fabric Yardage Estimator

🔢 Factors & Multiples Trainer

💧 Faraday Fluid Waves

🪄 Favicon & SVG Icon Generator

📏 Feet & Inches ⇄ cm

🏗️ Fence Calculator

🧲 Ferrofluid Spiking Lab

✨ Fiber Optic Light Guide Lab

🐚 Fibonacci & Special Sequences

🌀 Fidget Spinner

🔐 File Hash Checker

💰 Financial Budget Dashboard

⚖️ Financial Ombudsman Complaint Builder

🔥 Fire Escape & Smoke Safety Planner

🔥 FIRE Retirement Planner

🔥 Firefly Kuramoto Synchronization

📄 First Resume Builder

📊 Fiscal Quarter Finder

🍤 Fish Feeding & Vacation Planner

💊 Fish Medication Dosing

🐠 Fish Stocking Compatibility

🏃‍♂️ Fitness Score Analyzer

🌍 Flag & Capital Quiz

🔩 Flat-Pack Confidence Meter

📖 Flesch Reading Ease

✈️ Flight Delay Compensation Checker

🔥 Flue Draft & Stove Sizing Calculator

🌪️ Fluid Smoke Tunnel

🔠 Fluid Type Scale Generator

🍷 Food & Wine Pairing Matrix

🧊 Food Shelf-Life & Safety

🕸️ Food Web & Trophic Energy Lab

⚽ Football Points-Needed Calculator

🌍 Foucault Pendulum Spin

🎯 Foundation & Unit Circle

⚙️ Four-Bar Mechanism Lab

🌊 Fourier Series Synthesizer

🔢 Fractions Calculator & Visualizer

💼 Freelance Rate Calculator

🇫🇷 French Verbs & Pronunciation

⛽ Fuel Cost Calculator Pro

⛽ Fuel Economy Converter: MPG ⇄ L/100km ⇄ km/L

⛽ Fuel Economy MPG Converter

⛰️ Function Terrain 3D Explorer

🌌 Galaxy Collision & Tidal Tails

🍺 Gallons, Litres & Pints

🔔 Galton Board & the Bell Curve

🌿 Garden Planning Assistant

🫁 Gas Leak & Carbon Monoxide Response

🧮 GCF, LCM & Prime Factors

🧬 Genetics Laboratory

📐 Geodesic Area & Parcel Calculator

🇩🇪 German Cases & Gender

🌤️ Go Outsideometer

φ Golden Ratio Crop Calculator

⛳ Golf Stableford Points Calculator

⛳ Golf WHS Handicap Calculator

📊 GPA Calculator

🧭 GPS DMS ⇄ Decimal

🪨 Gravel & Aggregate Calculator

🕳️ Gravitational Lensing Lab

💬 Great Minds Quote Explorer

✈️ Great-Circle Route Planner

🧭 Grid Reference Trainer (OS)

🕯️ Grief Companion

🛒 Grocery Budget Tracker

🫁 Grounding & Breathing Coach

🧱 Grout & Tile Adhesive Calculator

🎸 Guitar Fret Position Calculator

🤸 Gymnastics Score Calculator

🧭 Gyroscopic Precession Lab

🔥 Habit Streak Grid

📈 Habit Tracker

🤾 Handball Scorekeeper

🪐 HarmonicOrbit Loom

🔒 Hash Generator

🎩 Hat Size Converter

🩸 HbA1c ⇄ Average Glucose

❤️ Heart Rate Zones Calculator

🥶 Heat & Cold Exposure Calculator

🥵 Heat Index Calculator

⛰️ Heightmap 3D Sculptor

⚠️ Herb & Prescription Safety

🩹 Herbal Poultice & Compress

🧴 Herbal Salve & Balm Crafter

🫖 Herbal Tea & Extraction Timer

🌿 Herbal Tincture Ratio Calc

🔢 Hex & Decimal Converter

💰 Hidden Bank Fee Calculator

🥾 Hike & Walk Time Planner

📜 Historical Timeline Builder

🚗 HMRC Mileage Allowance

🌴 Holiday Entitlement & Pro-Rata Calculator

🌈 Holographic Laser Spectrograph

🌅 Horizon & Line-of-Sight Calculator

🏎️ Horsepower, kW & Torque

💷 Hourly Wage, Overtime & Take-Home Estimator

💷 Hourly ⇄ Annual Salary

🚨 Household Emergency Plan

🪴 Houseplant Matchmaker

📦 HTML / CSS Minifier

🔤 HTML Entity Encoder & Decoder

🔤 HTML Entity Encoder / Decoder

📋 HTML Table Generator

📝 HTML to Markdown Converter

📡 HTTP Status Code Encyclopedia

🌐 HTTP Status Code Reference

🗜️ Huffman Coding: How Compression Works

🫀 Human Anatomy Explorer

🌸 Hummingbird Nectar & Spoilage

🌀 Hurricane Engine

🧊 Hypercube 4D Explorer

📷 Hyperfocal & Depth of Field

🏦 IBAN Validator & Formatter

🏒 Ice Hockey Goalie Stats

📅 ICS Event Builder

⚖️ Ideal Weight & BMI

🔢 IEEE-754 Converter

🖼️ Image Compressor & Resizer (100% Offline)

🗜️ Image Optimiser Studio

🖼️ Image to Base64 Studio

🌀 Impossible Object Viewer

⚡ Inductance Calculator

📉 Inflation Impact Calculator

📷 Instant QR & Image Reader

🎶 Instrument Care Guide

🎸 Instrument Tuner Reference

🧊 Insulation Savings Calculator

⚛️ Interactive Periodic Table

⏳ Intermittent Fasting Window

🌍 International GPA Calculator

🎵 Interval Ear Trainer

📦 Inventory Reorder Point Planner

📈 Investment Growth Calculator

🧾 Invoice Late Fee Calculator

🧾 InvoiceForge Generator

⚖️ IR35 Inside vs Outside Comparator

🔁 Irregular Verbs Trainer

📚 ISBN-10 ⇄ ISBN-13 Converter

📆 ISO Week Number Finder

🔢 Japanese Counters & Numbers

🎌 Japanese Kana Trainer

🎌 Japanese Kanji Helper

👑 Japanese Keigo Master

🧩 Japanese Particles Master

⚡ Japanese Verb Conjugator

⌨️ JavaScript Keyboard Event KeyCode Inspector

✈️ Jet Lag Sleep Shift Planner

📖 JLPT Vocabulary Studio

🔧 JSON & YAML Studio

🔧 JSON Beautifier & Linter

🧩 JSON Flatten / Unflatten

🧬 JSON Schema Forge

🌌 Julian Day Converter

🔐 JWT Decoder & Inspector

🔑 JWT Token Inspector

❤️ Karvonen Heart Rate Zones

☁️ Kelvin-Helmholtz Waves

⌨️ Keyboard Tester

📊 Keyword Density & Word Frequency

⚪ Kinetic Momentum Cradle

🧪 Kitchen Science Lab

🌀 Klein Bottle & Möbius Lab

⛵ Knots ⇄ mph ⇄ km/h

🇰🇷 Korean Hangul Trainer

🌦️ Köppen Climate Classifier

💵 L$ Linden Dollar Converter

🥬 Lacto-Fermentation Salt Calc

🪵 Laminate Flooring Calculator

⏰ Late Payment Interest & Chaser Letter

🧺 Laundry Care & Stain Solver

🫧 Lava Lamp

📆 Leap Year & Weekday

🧭 Learning Style Self-Assessment

🌊 Learning to Swim in Not Knowing

🚗 Lease vs Buy Calculator

💡 LED Current-Limiting Resistor

💡 LED Watt Equivalent Calculator

🧲 Lenz's Law Eddy Current Tube

💡 Lighting Design Calculator

💰 Linden Dollar Exchange

🐧 Linux Command Cheat Sheet

📡 Linux Process & Signal Reference

⚡ Lissajous Laser Projector

📅 Live Second Life Events

💬 LLM Prompt Token Counter

📈 Loan & Mortgage Amortization Schedule Calculator

📅 Loan Amortization Schedule

📋 Log Analyzer & Command Generator

📉 Logarithm Calculator

🕵️ Logic Detective Puzzle Club

⚡ Logic Gate Simulator

➗ Long Division Step-by-Step Trainer

📝 Lorem Ipsum & Placeholder Generator

📄 Lorem Ipsum & Placeholder Text

📜 Lorem Ipsum Generator

🌪️ Lorenz Attractor — the Butterfly Effect

📜 LSL Script Generator

🏦 LTV Mortgage Calculator

🎧 Lucid Binaural REM Stimulator

🎯 Lucid Dream Quest Taskboard

📓 Lucid Dream Sign Analyzer

✨ Lucid Dream Stabilizer Lab

💊 Lucid Dream Supplement Clock

👁️ Lucid Reality Check Trainer

🎲 Ludo

🔢 Luhn Check Digit Validator

💡 Lumens ⇄ Lux

🌙 Lunar Phase & Illumination

🌕 Lunar Tide Simulator

💰 Make Change Trainer (UK coins)

🪨 Mancala

🌀 Mandelbrot Set Explorer

📖 Manga to Anime Finder

🗺️ Map Projection Distortion Lab

🎱 Marble Run Builder

📊 Markdown & ASCII Table Generator

📄 Markdown Document Forge

📝 Markdown Live Editor

📝 Markdown Live Preview

▦ Markdown Table Generator

💹 Markup vs Margin Calculator

🌌 Math Universe Explorer

🧮 Maths Flashcards

🛏️ Mattress Size Converter

❤️ Mean Arterial Pressure

📊 Mean, Median, Mode & Range Trainer

📊 Mean, Median, Mode & Std Dev

🧂 Meat Brine & Cure Salinity

🌡️ Meat Internal Temperature Guide

💸 Meeting Cost Ticker

🕒 Meeting Overlap Planner

🔥 Melting Point Explorer

🎭 Meme Translator

⏳ Memento Mori Life Ticker

🎯 Memorization Helper

🏛️ Memory Palace Builder

🧮 Mental-Math Sprint

⚡ Metabolic Age Estimator

☄️ Meteor Shower Sky Lab

🔬 Microbiology Tools & Facts

🌤️ Migration & Thermal Lift Calc

🧠 MILD Lucid Dream Mantra Lab

📎 MIME Type Lookup

📐 Miter & Bevel Angle Calculator

🧪 Mock Data Generator

〰️ Moiré Optical Interference

⚛️ Molecule 3D Viewer

💸 Money Tracker

🎯 Monte Carlo π Estimator

🌘 Moon Phases & Eclipse Geometry

📡 Morse Code Translator

🏠 Mortgage Calculator

🏦 Mortgage Overpayment Calculator

⚡ Motor Startup Calculator

🏎️ Motorsport Lap Time & Stint Calculator

🧠 MrProphecy: Beat Memory

🏃 MrProphecy: Beat Runner

🤘 MrProphecy: Crowd Surf

🎛️ MrProphecy: Mix Board Challenge

🎧 MrProphecy: Name That Track

🥁 MrProphecy: Rhythm Tap

🛡️ MrProphecy: Studio Defender

🔤 MrProphecy: Title Scramble

🗺️ MrProphecy: Tour Manager

💿 MrProphecy: Vinyl Catch

🍂 Mulch Coverage Calculator

🎵 Music Theory Visualizer

🎵 Music Transposer

🪪 Nano ID Generator

📡 NATO Phonetic Alphabet Trainer

📡 NATO Phonetic Speller

⚡ Natural Electrolyte Tonic Lab

🍄 Nature ID Trainer

🕶️ ND Filter Exposure

🏐 Netball Scorekeeper

🧠 Neural Network Playground

🧠 NeuroSynapse Graph

🔀 Nginx Redirect Generator

⚬ Nine Men's Morris

🔄 Nitrogen Cycle Tracker

🎹 Note Frequency Calculator

📅 Notice Period End Date

🔢 Number Base Converter

✍️ Number to Words (Cheque Writer)

📋 Offline Kanban Sprint Board

⚡ Ohm's Law Calculator

📏 On-Screen Ruler & Pixel-to-Physical Converter

🏋️ One-Rep Max Calculator

🔬 Optical Tweezers & Trapping

🔬 Optics Calculator & Explorer

🛰️ Orbital Mechanics Lab

🚀 Orbital Mechanics Playground

📡 Oscilloscope Visualizer

⚫⚪ Othello (Reversi)

🔥 Oven Gas Mark Converter

📊 Overdraft & Interest Reclaim Calculator

🌙 Overnight Shift Duration

⏱️ Overtime Pay Calculator

🌸 Ovulation & Fertile Window

⏱️ Pace Reading Timer

🎨 Paint Calculator

🥘 Pan Size Converter

📄 Paper Size Converter

🧠 Parts of Speech Trainer

📧 Passive Aggressive Email Translator

🛂 Passport Photo Size Guide

🛡️ Password Strength & Crack-Time Estimator

🔐 Password Strength Checker

🗺️ Pathfinding Algorithm Visualizer

⚡ PCB Trace Width Calculator

🕰️ Pendulum Wave Array

📊 Percentage Change Calculator

📈 Percentage Change Calculator

⚛️ Periodic Table Explorer

⚗️ Periodic Table Quiz

🔢 Permutations & Combinations

💰 Personal Finance Dashboard

🛡 Personal Safety & Awareness Planner

😈 Petty Revenge Idea Generator

🌸 Phenology & Growing Degree-Day Lab

🔬 Physics Toolkit

🖼️ Picture Hanging Calculator

🔧 Pipe Sizing Guide

🎨 PixelVerse Canvas

🍕 Pizza Dough Ferment Master

🔍 Plagiarism Checker

📖 Plain Language Decoder

🪐 Planet & Ring Designer 3D

🌍 Planet Surface 3D Explorer

🌿 Plant Encyclopedia (Live)

🌱 Plant Spacing Calculator

🪣 Plastering Calculator

🔤 Platform Character Counter

🎵 Playlist Name Generator

☣️ Poison & Chemical Exposure Response

🎲 Polyhedral Dice 3D Roller

⏱️ Pomodoro Flow Timer

🏊 Pool & Spa Volume

⚡ Power Calculator

🏋️ Powerlifting DOTS & Wilks Score

🎯 Practice Tracker

⏱️ Precision Split Stopwatch & HIIT Interval Timer

🤰 Pregnancy Due Date & Week-by-Week Calculator

🤰 Pregnancy Due Date Calculator

🤰 Pregnancy Weight Gain Guide

⚽ Premier League Live

⏱️ Price Tag in Hours of Your Life

🧮 Prime Factorisation Trainer

🔢 Prime Number Checker

🖨️ Print Size & DPI Calculator

🌈 Prism Optics & Snell's Law

🛡️ Privacy Policy Generator

💷 Pro Rata Salary Calculator

🎲 Probability Calculator

🎲 Probability Paradox Lab

🕐 Procrastination Justifier

🚀 Productivity Score

📄 Professional CV Builder

🌍 Professional Ecology Calculator

🙃 Professional Excuse Generator

🎵 Professional Metronome

📅 Project Deadline Calculator

📊 Project Profitability Estimator

🎯 Projectile Motion Simulator

📽️ Projector Throw Distance

✍️ Proofreading & Style Checker

☁️ Psychrometric & Dew Point

🎤 Public Speaking Coach

📝 Punctuation Mastery Guide

🐾 Puppy Adult Weight Forecaster

↔️ px ⇄ rem ⇄ em Converter

📐 Pythagoras Calculator

△ Pythagoras Triangle Solver

📱 QR Code Generator

❤️ QTc Interval (Bazett)

𝑥² Quadratic Equation Solver

🧮 Quadratic Equation Solver

🔬 Quantum Energy Calculator

🔬 Quantum Eraser & Double Slit

⚛️ Quantum Wave Tunneling

🔗 Query String Parser

🧠 Quick Quiz Maker

🧵 QuiltWeaver Tapestry

🏃 Race Pace Predictor & Training Paces

∠ Radians ⇄ Degrees Converter

☢️ Radioactive Decay Lab

⛰️ Rain Shadow & Orographic Lift Lab

🌧️ Rainfall & Flash Flood Lab

🌧️ Rainwater Harvest

🪣 Rainwater Harvesting & Tank Simulator

🎲 Random Number Generator

🎲 Random Number, Dice & Coin

🎲 Random Number, Dice & Name Picker

🦅 Raptor & Flight Silhouette ID

➗ Ratio & Proportion

🗝️ Raycast Pocket Dungeon

⏲️ RC Time Constant

📊 Readability Analyzer

📚 Reading Time Calculator

🍳 Recipe Converter

🧮 Recipe Ingredient Scaler

🎤 Recording Basics

🌳 Recursion & Memoization Explorer

🔴 Redshift & Cosmic Distance

📋 Redundancy & Notice Entitlement Calculator

🔍 Regex Cheat Sheet & Tester

🔍 Regex Tester & Builder

⚡ Regex Tester & Explainer

⚡ Regex Transform Studio

⏰ Reminder Tool

🏠 Rent Calculator

🔑 Rental Yield Calculator

🏠 Rental Yield Deal Analyser

🎨 Resistor Color Code

🌟 Resolution & Limiting Magnitude

🍽️ Restaurant Bill Splitter with Itemised Shares

📄 Resume Builder

⏱️ Retainer Capacity Planner

💰 Retirement Calculator

💸 Reward Site Earnings Reality Check

🌊 Reynolds Number Simulator

📡 RF Link Budget & Fresnel Zone Planner

🪞 Rhyme Finder

🥁 Rhythm Generator

🍚 Rice-to-Water Ratio Calculator

🏷️ Rich Result Forge

🧙 Riley: Goblin Smasher

💍 Ring Size Converter

🏞️ River Meander Lab

🗺️ Robots.txt & Sitemap Generator

🪨 Rock & Mineral Identifier

🪨 Rock Cycle & Mineral ID Lab

📈 ROI Calculator

🔄 Romaji & Kana Converter

🏛️ Roman Numeral & Number Base Converter

🏛️ Roman Numeral Converter

🏠 Roof Pitch & Rafter Calculator

🌡️ Room BTU & HVAC Sizing Calculator

🛋️ Room Layout Planner

🪢 Rope Physics

📅 Round-Robin Fixture Generator

🔄 Rounding & Estimation Trainer

🚣 Rowing Erg Pace Calculator

🏉 Rugby Points Score Builder

⏳ Rule of 72 Doubling Time

🏃 Running Cadence & Stride Length

🏃 Running Split Pace Calculator

🛫 Runway & Burn Simulator

📉 SaaS Churn Revenue Impact

📈 SaaS LTV & CAC Calculator

💰 Salary Calculator

💼 Sales Commission Calculator

🏜️ Sand Dune Lab

⏳ Sand Hourglass

⏳ Sandpile Mandala

🎅 Santa Tracker & Message Center

🎅 Santa's Naughty List Quiz

💰 Savings Calculator

🌌 Scale of Reality

🎹 Scale Trainer

🛡️ Scam Sense Checker

🇪🇺 Schengen 90/180 Calculator

🔥 Schlieren Optics Airflow

🔬 Science Experiment Generator

🔬 Science Study List

⚛️ Science Unit Converter

🧮 Scientific Calculator

📚 Scientific Formula Library

🔬 Scientific Method Helper

🔬 Scientific Notation & Sig Figs

🔬 Scientific Unit Converter

🔤 Scrabble Score Calculator

🅰️ Scrabble Word Score

🖥️ Screen PPI Calculator

📏 Screen Ruler & Pixel Measure

🔩 Screw & Drill Bit Size Chart

🌊 Seawater Salinity & Density

🏗️ Second Life Builder's Mate

🛒 Second Life Marketplace Search

🗺️ Second Life Region Map

📚 Second Life Surnames Encyclopedia

🖼️ Second Life Texture Tool

🎁 Secret Santa Generator

🛡️ Section 75 Claim Calculator & Letter

📖 See Your Life Through a Narrator's Eyes

🌱 Seed Germination Calculator

📦 SemVer Compare & Bump

🔍 SEO & Content Optimizer

🔍 SEO Meta Tag Previewer

✍️ SEO Writing Assistant

🔢 Sequences & Series Calculator

🎼 Sheet Music Reference Generator

📏 Shelf Bracket Calculator

🗓️ Shift Labour Cost Planner

👟 Shoe Size Converter

🐎 Showjumping Faults Calculator

📧 Signature Forge

🤝 Sincere Apology Builder

🗑️ Skip Hire Volume Calculator

📏 SL Avatar Height & Proportion Calculator

👥 SL Group Slot Calculator

🏠 SL Land Tier Calculator

🔺 SL Mesh Upload Cost Calculator

👗 SL Outfit Planner

🧱 SL Prim Budget Planner

🌀 SL Teleport & SLURL Planner

🖼️ SL Texture Upload Cost Calculator

🕐 SL Time Converter

🌙 Sleep & REM Optimizer

🛏️ Sleep Cycle Calculator

😴 Sleep Debt Calculator

🛡️ Sleep Paralysis Navigator

🔗 Slug Generator

⚖️ Small Claims Court Guide & Cost Calculator

📄 Small Claims Letter Before Action Builder

📚 Smart Flashcards

🌐 Smart Graphing Calculator

💰 Smart Loan Calculator

🥗 Smart Macros Calculator

🧳 Smart Packing List

🎯 Smart Quiz Generator

🛒 Smart Shopping List

🔍 Smart Spelling Checker

🐍 Snakes & Ladders

🎱 Snooker Snookers-Required Calculator

❄️ Snowflake Crystal Lab

🎨 Social Image Resizer

🖼️ Social Preview Generator

🏛️ Socratic Thinking Coach

🌱 Soil & pH Guide

⚡ Solar Inverter Sizing

☀️ Solar Panel Calculator

🪐 Solar System Explorer

🌌 Solar System Simulator

🪐 Solar System Size Comparator

🌊 Soliton Wave Flume Tank

🧪 Solution Dilution Lab

🎵 Song Writer (General Advice)

📊 Sorting Algorithm Visualizer

🔊 Sound Decibel Calculator

🍞 Sourdough Baker's Math Lab

🥩 Sous Vide Time & Temperature

🕳️ Spacetime Curvature

🇪🇸 Spanish Verb Conjugator

🔊 Speaker Ohm Wiring

🚀 Special Relativity Simulator

🚗 Speed Distance Time Calculator

⚡ Speed Reading Trainer

⚡ Speed-Reading RSVP Trainer

⚪ Sphere, Cylinder & Cone Volume

🍽️ Split Bill Calculator

🧪 Split Test Lab

🎮 Sprite Sheet Studio

🗃️ SQL Formatter & Query Helper

🎬 SRT Subtitle Time Shifter

🔑 SSH Command Generator

🪜 Stair Stringer Calculator

🚀 Starfield Warp Drive

🐦 Starling Murmuration

📊 Statistics Calculator

⚙️ Steam Tables Lab

🚶 Steps to Calories Converter

⚖️ Stone, Pounds ⇄ kg

⏱️ Stopwatch & Lap Timer

🎲 Story Dice Plot Twister

🏘️ Street Sharing Planner

💳 Stripe & PayPal Fee Calculator

🧱 Stud & Wall Framing Calculator

💰 Student Loan Calculator

📚 Study Planner

📚 Study Timer (Pomodoro)

🔍 Subject Access Request (SAR) Generator

🌐 Subnet & CIDR Calculator

🧩 Sudoku Trainer (unique puzzles, hints & solver)

🌞 Sundial Designer

🌅 Sunrise & Sunset Calculator

🧲 Superconductor Flux Pinning

⚡ SVG Path Optimizer & Minifier

📐 SVG Path Visualizer

🏊 Swimming Pace & CSS Calculator

🔤 Syllable Counter

🔄 Synonym Finder

⚙️ Systemd Service Generator

🔥 Tabata Timer

🏓 Table Tennis Scorer

🧾 Take-Home Pay Breakdown

🗣️ Talk to Your Body (It's Been Trying to Tell You Something)

🔩 Tap Drill Size

❤️ Target Heart Rate Calculator

📋 Task Prioritizer Matrix

💰 Tax Estimator & Calculator

⚡ TDEE & Calorie Calculator

🌋 Tectonic Plate Drift Calculator

🔭 Telescope Collimation Check

🎵 Tempo & BPM Map

🎳 Ten-Pin Bowling Score Calculator

🏠 Tenancy Deposit Calculator (England)

🎾 Tennis Match Scorer

⚡ Tesla Atmospheric Plasma

🌟 Testimonial Card Generator

🔠 Text Case & Slug Converter

🔡 Text Case Converter

🔠 Text Case Converter Toolkit

🔍 Text Diff & Compare Checker

🔎 Text Diff Checker

📝 Text Diff Viewer

📊 Text Statistics Analyzer

🎨 Text to ASCII Art

✍️ Text to Handwriting

🖼️ Text to Image Generator

🔊 Text to Speech

🔢 Text ↔ Binary Converter

🔤 Text ⇄ Hex ⇄ Binary

🔊 Text-to-Speech Reader (Offline Browser Voices)

🌙 The 3am Worry Sorter

🧠 The Bayes Workshop

🛡️ The Blazon Workshop

🪙 The Coin Room

📐 The Constant Treasury

🔢 The Constants of Reality

☀️ The Daylight Lab

📚 The Dewey Stacks

🔊 The Echo Chamber

⚗️ The Element Hall

🧬 The Emotions You Inherited (But Never Chose)

🕯️ The Grief No One Validates

🥈 The Hallmark Bench

🧬 The Hominin Corridor

🐍 The Identities You're Dragging Behind You

🎭 The Illusion Gallery

📜 The Kalends Desk

💡 The Light Budget

🌌 The Messier Gallery

💎 The Mohs Gallery

🧪 The Moisture Lab

🏯 The Nengō Desk

👁️ The Observer Effect

🏛️ The Orders Bench

🧮 The Overthinker's Calculator

🎨 The Pigment Cabinet

💧 The Pipe Lab

⚛️ The Quantum World

🦴 The Radiocarbon Laboratory

👑 The Regnal Desk

ᚠ The Rune Cabinet

🦕 The Scale Hall

🏺 The Seven Wonders

🏗️ The Stress Gallery

☀️ The Sundial Bench

🧱 The Thermal Wall

🏷️ The Thing Namer

🏷️ The Tombstone Desk

𓂀 The Uniliteral Case

⚡ The Watt Exchange

🧠 The Worry Sorter: Actionable vs. Noise

🔥 Thermodynamics Calculator

🖼️ Thumbnail Preview Tool

🎮 Tic Tac Toe Game

🌊 Tidal Window & Crossing Planner

🧱 Tile & Flooring Estimator

🌍 Time Zone Converter

⏱️ Timelapse Interval

⏳ Timeline of Everything

🔢 Times Tables Drill Trainer

✊ Tiny Revolts Against Your Own Prison

💸 Tip & Split Calculator

🧾 Tip Calculator

🎤 Tongue Twister Trainer

🌪️ Tornado & EF-Scale Lab

⚡ Torsional Vibration Lab

🏆 Tournament Bracket Generator

🗼 Towers of Hanoi

🛸 TR-3B Flight Simulator

⚡ Transformer Sizing Calculator

🌍 Translation Helper

✈️ Travel Trip Planner

🏊‍♂️ Triathlon Race Planner

🌀 True Scale of Space

🧮 Truth Table Generator

🌊 Tsunami Runup Simulator

🐆 Turing Reaction Diffusion

🦃 Turkey Thaw & Cook Time

📺 TV Viewing Distance Calculator

⌨️ Typing Speed Test

⌨️ Typing Story Sprint

🛞 Tyre Size Comparison

🎓 UCAS Tariff Points

🍺 UK Alcohol Units Calculator

🗺️ UK Counties & Regions Quiz

🏖️ UK Holiday Entitlement

📮 UK Postcode Formatter

🚚 Ultimate Moving Planner

🎵 Ultimate Music Quiz

🔊 Ultrasonic Acoustic Levitation

🐬 Underwater Acoustics Lab

🌐 Unicode Converter

🛒 Unit Price Comparator

🖼️ Universal Thumbnail Generator

🔄 Universal Unit Matrix

⏱️ Unix Timestamp Converter

🕰️ Unix Timestamp Converter

⏱️ Unix Timestamp Converter

🔗 URL Encoder & Query Builder

🔗 URL Encoder / Decoder

🔗 URL Encoder, Decoder & Parser

🕵️ User Agent & Browser Client Inspector

🎮 Username Generator

🔗 UTM Campaign URL Builder

🆔 UUID & Random ID Generator

🆔 UUID & ULID Generator

🆔 UUID / GUID & Random ID Bulk Generator

🆔 UUID Generator

⚡ Van de Graaff Generator

🧾 VAT & Sales Tax Calculator (Add or Remove)

💷 VAT / GST / Sales Tax Calculator

🪪 vCard Generator

🔵 Venn Diagram Visualiser

🛡️ Vibration Isolator Designer

🎬 Video Bitrate File Size

🔨 Virtual Builder's Workmate

🌋 Volcano Eruption Simulator

🏐 Volleyball Score Sheet & Rotation

⚡ Voltage Divider

⚡ Voltage Drop Calculator

🗿 VoxelMonolith 3D

🏃 VO₂ Max Calculator

📏 Waist-to-Height Ratio

📏 Waist-to-Hip Ratio Calculator

🔩 Wall Anchor Selector

🧻 Wallpaper Estimator

🧪 Water Change & Salinity

💧 Water Density Anomaly Lab

⚡ Water Dielectric Lab

🚰 Water Hardness (LSI) Lab

🧪 Water Ionization & pH Lab

🏔️ Water Phase Diagram Lab

💧 Water Purification Planner

🧪 Water Surface Tension Lab

〰️ Wave Machine

🌙 WBTB Lucid Dream REM Planner

👁️ WCAG Contrast & Vision

⛽ Web3 Gas Fee Estimator

📊 Weighted Grade Calculator

🏋️ Weightlifting Sinclair Score

🤔 What Does That Emoji *Actually* Mean?

🧠 What Is Consciousness?

🎬 What Should I Watch?

🛞 Wheelbuilding Spoke Length & Tension Calculator

🏷️ Wholesale Pricing & Margin

🕳️ Why Is There Something Rather Than Nothing?

📶 Wi-Fi QR Pass Generator

📶 WiFi Speed & Download Time Calculator

🌀 WILD Hypnagogia Transition

🔥 Wildfire Behaviour Lab

☕ Will You Sleep Tonight? (Caffeine Check)

🌫️ Wilson Cloud Chamber

🌬️ Wind Chill Calculator

✈️ Wind Triangle & Flight Leg Planner

🌬️ Wind, Fetch & Wave Forecaster

⚡ Wire Gauge Calculator

📝 Word Counter & Analyser

📊 Word Frequency Counter

📝 Word List Flashcards

⏱️ Work Hours & Pay Calculator

🌍 World Capitals Quiz

🌍 World Meeting Time Zone Planner

✍️ XMAS Card Writer Assistant

🌳 XML Beautifier

📐 XML Formatter & Validator

🎲 Yahtzee

📋 YAML ↔ JSON Converter

🍞 Yeast Converter

📖 You're Already Living Your Dream (You Just Forgot)

🛡️ Your Inner Critic Is Trying to Save You

⏰ Your Life Is Telling a Different Story Than You Think

👧 Youth Team Rotation Planner

🎛️ YouTube DJ Mixer

AI-Style Summary Generator

Algebra Solver

Anatomy Tools & Facts

Astronomy Calculators

Battery Sizing Calculator

Biology Tools

Birthday Reminder

Boiling Point Finder

BPM Tap Counter (Pro)

Break‑Even Calculator

Business Writing Assistant

Calculus Helper

Calorie Calculator

Capacitor Calculator

Career Path Planner

Cat Photo Viewer

Chemistry Helper

Child Growth Tracker

Creative Writing

Discount Calculator

Evolution AI Walker

Geography Helper

Geology Tools & Facts

Geometry Calculator

Gift Helper 🎁

Goal Tracker 🎯

Grade Calculator 📊

Grammar Proofreader ✍️

Lab Planner

Lab Safety Tools & Facts

Languages Tool

Laundry Tracker

Lean Body Mass Calculator

Linear Algebra Helper

Materials Science Tools & Facts

Math Helper

Matrices Calculator

Meal Cost Calculator

Meeting Planner & Scheduler

Party Planner

Password Generator

Pet Care Tracker

Science Quiz Generator

Slinky Physics

Smart Garden Task Planner

Subscription Tracker

Vocabulary Trainer

Weekly Meal Planner

Which Year Are You? 🕰️

sitemap.xml

The full XML sitemap for search engines.

↗

feed.xml

RSS 2.0 feed of changes and new tools.

↗

llms.txt

Machine-readable overview for LLM crawlers.

↗

ai.txt

AI policy: training, retrieval, republishing rules.

↗

security.txt

Security disclosure address and expiry.

↗

robots.txt

Crawler rules (explicit allow for major AI crawlers).

↗

cards.json

Complete tool catalogue as JSON.

↗

related.json

Computed related-tools map for all 1165 tools.

↗

manifest.json

PWA manifest.

↗