๐ฐ Money & finance
Mortgage Calculator
Monthly payments, total interest, full amortisation schedule.
#2๐ฐCompound Interest
See exactly how your savings grow year by year.
#3๐ณLoan Calculator
Personal, auto, or student loans with extra-payment scenarios.
#4๐ผSalary Calculator
Hourly to annual, take-home pay, gross/net breakdown.
#5๐Tax Calculator
UK income tax, National Insurance, and pension estimates.
#6๐ตTip Calculator
Split the bill fairly, with custom tipcalculator percentages.
#7๐ฑCurrency Converter
Live exchange rates for 150+ currencies, no signup.
#8๐ท๏ธDiscount Calculator
Sale price, savings, and the actual percentage off.
#9๐Inflation Calculator
What was ยฃ100 in 1990 worth in 2024? Find out.
#10๐ROI Calculator
Return on investment with time, cash flow and IRR.
#11โ๏ธBreak-Even Calculator
How many units until you cover your costs?
#12๐ฅFIRE Calculator
Financial Independence Retire Early โ your number, your date.
๐ Math & conversion
Percentage Calculator
Increase, decrease, difference, percent of.
#14๐Universal Unit Matrix
Length, mass, volume, area, time, speed, energy.
#15โ๏ธScientific Units
Newtons, joules, pascals, watts, kelvin and more.
#16๐งฎAlgebra Solver
Solve linear, quadratic, and cubic equations step by step.
#17๐ขEquation Solver
Symbolic math โ single variable, polynomials, radicals.
#18๐Graphing Calculator
Plot functions, intersections, derivatives, on a real grid.
#19๐Hex / Decimal / Binary
Convert between bases 2, 8, 10, 16 โ and ASCII.
#20๐Date Calculator
Days between dates, add/subtract, age on a date.
#21๐Statistics Calculator
Mean, median, mode, std dev, quartiles, regression.
#22๐ฒProbability Calculator
Combinations, permutations, distributions, Bayes.
๐ ๏ธ For developers
JSON Formatter & Linter
Pretty-print, validate, minify, sort keys, escape.
#24๐JWT Decoder
Decode header, payload and signature. No data leaves your browser.
#25๐ผ๏ธImage to Base64
Convert any image to a data URL โ for inline embedding.
#26๐Hash Generator
MD5, SHA-1, SHA-256, SHA-512 โ for files and text.
#27๐Subnet CIDR Calculator
Network, broadcast, usable range, host count from any CIDR.
#28๐SEO Meta Previewer
See exactly how your page looks in Google search results.
#29๐ฑSocial Preview Generator
Open Graph & Twitter card preview, all platforms.
#30๐ ฐ๏ธASCII Banner Generator
Big text for READMEs, terminals, commit messages.
#31๐SVG Path Visualizer
Edit SVG paths with a live preview, copy the result.
#32๐ก๏ธPrompt Injection Lab
Test your prompts against common injection techniques.
๐ Writing & productivity
Password Generator
Strong random passwords, length and character set control.
#34๐UUID Generator
v1, v4, v7 โ bulk generate, format, copy.
#35๐งพInvoice Generator
Branded PDF invoices, no signup, no watermark.
#36๐Markdown Live Editor
Side-by-side editor + preview, export to HTML.
#37๐Apology Builder
Honest, specific, short โ the parts of an apology that work.
#38๐ฅHabit Streak Grid
GitHub-style year heatmap for your daily habits.
#39๐Resume ATS Scanner
Check whether your resume gets past the bot filter.
#40๐ก๏ธBlame Deflector
Polite phrasing for the workplace โ when it's not your fault.
๐ต Music & audio
BPM Tapper
Tap to the beat โ instant tempo, no signup.
#42๐๏ธTone Generator
Pure sine/square/saw tones, 20Hzโ20kHz, save as WAV.
#43๐ผMetronome
Adjustable tempo, time signatures, accent patterns.
#44๐ธChord Finder
Find chords by name, see fingerings, hear them.
#45๐Chord Transposer
Move any song into the key that suits your voice.
#46๐Ear Trainer
Intervals, chords, scales โ practice mode with scoring.
๐ฅ Health, fitness & food
BMI Calculator
Body Mass Index with healthy range, metric and imperial.
#48๐ฅTDEE Calculator
Total Daily Energy Expenditure, by activity level.
#49๐ฅCalorie Calculator
Maintenance, deficit, surplus โ based on your real TDEE.
#50๐ฅฉMacro Calculator
Protein, fat, carb split for any goal.
#51๐ฅฉSous Vide Cooker
Time & temperature tables for every cut of meat.
#52๐Sourdough Hydration
Flour, water, salt โ by weight, not guesswork.
๐จ Design & visual
Color Palette Extractor
Drop in an image, get the dominant colours with hex codes.
#54๐๏ธWCAG Contrast Checker
AA/AAA contrast, plus colour-blindness simulation.
#55๐Aspect Ratio Resizer
16:9, 1:1, 4:5 โ keep what matters, crop the rest.
#56๐ ฐ๏ธFavicon Generator
Multi-resolution .ico + Apple touch + manifest icons.
๐ฎ A few delightful surprises
Black Hole Lensing
Real-time general-relativity ray tracer in your browser.
#58๐Turing Patterns
Reaction-diffusion morphogenesis โ like real animal coats.
#59โกVan de Graaff 400kV
Interactive electrostatic generator simulation.
#60๐Aurora Borealis
Magnetic-field-driven atmospheric plasma simulation.
See the full 1164-tool catalogue
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Browse all 1165 tools โ By use case Just added Help & FAQ