Games
Classic 3×3 tic-tac-toe against a random AI, an unbeatable minimax AI, or a friend. Keeps score across rounds.
tic-tac-toeMath & Numbers
Compute torque, force, or lever arm from τ = r·F·sin(θ), with the perpendicular force component shown
torque-calculatorGeography
Estimate local tide height and upcoming high/low tides from a known reference high tide.
tide-calculatorData Visualization
Render hierarchical data as a squarified treemap where area encodes each item's share
treemap-generatorMath & Numbers
Calculate Gibbs free energy ΔG = ΔH − TΔS, reaction spontaneity, equilibrium temperature, and equilibrium constant K.
thermodynamics-gibbs-calculatorGeography
Find the IANA timezone for any latitude / longitude: returns the timezone name (e.g. Asia/Shanghai), the current UTC offset, whether daylight saving time is active, the local wall-clock time, and the nearest reference cities. Fully offline — uses a built-in city/timezone reference database with nearest-reference matching.
timezone-lookup-by-coordinatesText Processing
Convert text to editorial-quality Title Case using AP, Chicago, or Wikipedia style rules. Lowercases function words, capitalizes first/last words and after colons, handles hyphenated compounds.
title-case-converterCalculator
Estimate how many tiles you need to cover a room, including layout-aware waste (straight, 45° diagonal, herringbone, basketweave), boxes to buy, grout volume and weight, and an optional cost total. Enter room and tile dimensions plus joint width to get a ready-to-order material list.
tile-coverage-estimatorText Processing
Shrink text into tiny Unicode forms — superscript (ᴴᵉˡˡᵒ) or subscript (ₕₑₗₗₒ). Plain Unicode text, no font needed.
tiny-textText Processing
Add an underline beneath every character via the Unicode combining mark U+0332. Plain text — no HTML needed.
underline-textCalculator
Enter a tire size (285/70R17), differential/final-drive ratio, and transmission gear ratios to compute the true overall tire diameter, circumference, revolutions per mile/km, an RPM × gear speed table, effective final drive after a tire change, and speedometer error. Metric or imperial units, with optional before/after tire comparison.
tire-gear-ratio-calculatorText Processing
Paste a long text and split it into a numbered X thread that respects the 280-character limit. Splits on word/sentence/paragraph boundaries, auto-adds 1/N numbering, weighs CJK and full-width characters correctly, counts URLs as 23 characters, and shows a live X-style preview card for each tweet with a character meter.
twitter-thread-splitter