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# Paint by Habits 🎨
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A whimsical habit tracker where consistency paints a picture. You define your
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daily habits and pick a pixel-art image; every habit you check off reveals a few
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pixels. Over days and weeks the artwork emerges — finish it, celebrate, pick the
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next one.
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## What it is
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- **One self-contained file:** `index.html`. Vanilla JS + CSS, no build step,
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no frameworks, zero network requests. Works from `file://` or any static host.
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- **Local-only:** all data lives in your browser's `localStorage`. No server,
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no accounts, no tracking.
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- **Portable:** export your full state as a JSON backup and import it on
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another device.
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## How it works
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Each artwork is a pixel grid. On start, a seeded PRNG (mulberry32 +
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Fisher–Yates) fixes a random reveal order that stays stable across sessions.
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Checking off habits reveals pixels, and **the more you do in a single day, the
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bigger the reward** — the first habit each day is worth 1 unit, the second 2,
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the third 3, and so on (so a 4-habit day earns 1 + 2 + 3 + 4 = 10 units).
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**Streaks multiply everything:** each day's units are scaled by the length of
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your active streak, so on a 3-day streak the first check is worth 3 units and
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the second 6, and on a 5-day streak they're worth 5 and 10. The per-image
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reveal rate is sized so a "perfect month" of doing everything daily just fills
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the picture. Pixels never un-reveal across days; missing a day just pauses
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progress. Includes 8 built-in pixel artworks, or upload any image to pixelate
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it into a 16–48 cell grid.
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Dark/light theme follows your OS by default, with a manual override. Streaks
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count any day you checked at least one habit; days where you did everything get
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a ✨ perfect-day sparkle.
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## Run it
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Open `index.html` in a browser. That's it. To host it, copy the file to any
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static host.
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## Test it
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There is no test harness checked in (single-file app). Validation performed:
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`node --check` on the extracted script, a grep proving zero external
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references, and scripted jsdom flow tests covering onboarding, check/uncheck
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persistence, day rollover, uncheck floor clamping, corrupt-state recovery,
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storage-unavailable mode, import validation, and the completion/celebration
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flow. See `docs/DESIGN.md` §9 for the edge-case checklist.
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## License
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Dual-licensed under [Apache-2.0](../LICENSE-APACHE) and [MIT](../LICENSE-MIT),
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following Rust ecosystem convention for this repository.
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## Disclaimer
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This software was written with Claude Code. Design by **Claude Fable 5**
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(`claude-fable-5`), implementation by **Claude Sonnet 5** (`claude-sonnet-5`),
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review and verification by **Claude Opus 4.8** (`claude-opus-4-8`).
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