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Paint by Habits 🎨

A whimsical habit tracker where consistency paints a picture. You define your daily habits and pick a pixel-art image; every habit you check off reveals a few pixels. Over days and weeks the artwork emerges — finish it, celebrate, pick the next one.

What it is

One self-contained file: index.html. Vanilla JS + CSS, no build step, no frameworks, zero network requests. Works from file:// or any static host.
Local-only: all data lives in your browser's localStorage. No server, no accounts, no tracking.
Portable: export your full state as a JSON backup and import it on another device.

How it works

Each artwork is a pixel grid. On start, a seeded PRNG (mulberry32 + Fisher–Yates) fixes a random reveal order that stays stable across sessions. Every habit keeps its own streak — checking a habit reveals pixels equal to its own current streak length: 1 pixel the first day, 2 the next consecutive day, 3 the day after, and so on. There's no bonus for doing several habits in one day; each habit scores purely on its own history. Bigger images just take longer to fill in. Pixels never un-reveal across days; missing a day resets that habit's streak, but never erases pixels already earned. Includes 8 built-in pixel artworks, or upload any image to pixelate it into a 16–48 cell grid.

Dark/light theme follows your OS by default, with a manual override. Each habit shows its own streak inline on its row; days where you did everything get a ✨ perfect-day sparkle.

Run it

Open index.html in a browser. That's it. To host it, copy the file to any static host.

Test it

There is no test harness checked in (single-file app). Validation performed: node --check on the extracted script, a grep proving zero external references, and scripted jsdom flow tests covering onboarding, check/uncheck persistence, day rollover, uncheck floor clamping, corrupt-state recovery, storage-unavailable mode, import validation, and the completion/celebration flow. See docs/DESIGN.md §9 for the edge-case checklist.

License

Dual-licensed under Apache-2.0 and MIT, following Rust ecosystem convention for this repository.

Disclaimer

This software was written with Claude Code. Design by Claude Fable 5 (claude-fable-5), implementation by Claude Sonnet 5 (claude-sonnet-5), review and verification by Claude Opus 4.8 (claude-opus-4-8).

2.4 KiB Raw Blame History Unescape Escape