# Fun & games

> A network of 12 focused, deterministic tools. Every tool has a human page, a JSON API, an OpenAPI description and an MCP tool that all return the same result (inputs, result, units, assumptions, sources, timestamps).

## Machine interfaces
- Tool catalog (JSON): https://fun.usefulweb.site/api/v1/tools
- OpenAPI (all tools): https://fun.usefulweb.site/openapi.json
- MCP server (all tools + workflows): https://fun.usefulweb.site/mcp
- Pick a tool for a natural-language request: POST https://fun.usefulweb.site/api/v1/tools/prompt-to-tool-router/calculate {"request": "..."}

## Tools
- [Chore Roulette](https://choreroulette.usefulweb.site/): Spin a fair chore rota: random but balanced by effort, with a “not again” rule. API: POST https://fun.usefulweb.site/api/v1/tools/chore-roulette/calculate
- [Elo/Glicko Rating Lab](https://eloglickoratinglab.usefulweb.site/): Rate players from game results with Elo, Glicko-1 and Glicko-2; history chart and win odds. API: POST https://fun.usefulweb.site/api/v1/tools/elo-glicko-rating-lab/calculate
- [Emoji Cipher Playground](https://emojicipherplayground.usefulweb.site/): Turn secret notes into emoji and back: substitution, Caesar shift and base-emoji. API: POST https://fun.usefulweb.site/api/v1/tools/emoji-cipher-playground/calculate
- [Equation Art Studio](https://equationartstudio.usefulweb.site/): Turn math into art: parametric, polar, Lissajous, rose and spirograph curves. API: POST https://fun.usefulweb.site/api/v1/tools/equation-art-studio/calculate
- [Keyboard Heatmap Visualizer](https://keyboardheatmapvisualizer.usefulweb.site/): Paste any text: see which keys and fingers do the work on QWERTY, Dvorak, Colemak & co. API: POST https://fun.usefulweb.site/api/v1/tools/keyboard-heatmap-visualizer/calculate
- [Movie & Series Marathon Planner](https://runtimemarathonplanner.usefulweb.site/): Plan a binge: when each movie or episode starts and ends, total days, and a calendar. API: POST https://fun.usefulweb.site/api/v1/tools/runtime-marathon-planner/calculate
- [Movie Night Consensus Picker](https://movienightconsensuspicker.usefulweb.site/): Everyone ranks the films, vetoes count: Borda, approval, runoff and Condorcet decide. API: POST https://fun.usefulweb.site/api/v1/tools/movie-night-consensus-picker/calculate
- [Padel & Pickleball Scheduler](https://padelpickleballscheduler.usefulweb.site/): Fair Americano or Mexicano doubles rounds with balanced sit-outs, scores and standings. API: POST https://fun.usefulweb.site/api/v1/tools/padel-pickleball-scheduler/calculate
- [Password Entropy Race](https://passwordentropyrace.usefulweb.site/): Race 2–6 passwords or passphrases: entropy, pattern penalties and crack times. API: POST https://fun.usefulweb.site/api/v1/tools/password-entropy-race/calculate
- [Regex Golf Arena](https://regexgolfarena.usefulweb.site/): Match the left list, avoid the right list — in as few characters as possible. API: POST https://fun.usefulweb.site/api/v1/tools/regex-golf-arena/calculate
- [Sports What-If Simulator](https://sportswhatifsimulator.usefulweb.site/): Simulate a match or a small league with a Poisson goal model — and replay “what if”. API: POST https://fun.usefulweb.site/api/v1/tools/sports-what-if-simulator/calculate
- [Tournament Bracket Maker](https://tournamentbracketmaker.usefulweb.site/): Single or double elimination or round robin: seeded brackets, byes, results and downloads. API: POST https://fun.usefulweb.site/api/v1/tools/tournament-bracket-maker/calculate

## Workflows