Lucas WintherandClaude Opus 5
71e8fc948b
monthView folds from the start of the dataset, so it costs O(months) per call. The summary sheet and every per-post sheet each called it once per (post, month), making a full export O(posts x months^2). buildWorkbook now takes one pass, indexes the figures by post, and hands that to the sheets. TODO called this "fine at personal-budget scale". Measured against the old code it is not, once history accumulates: 30 posts over 10 years went from 7983 ms to 135 ms (59x), and that work is synchronous on the main thread, so it was a visible freeze on clicking Export. 10 posts x 2 years: 44 ms -> 2.5 ms. content.xml is byte-for-byte identical on a fixture exercising every sheet (versioned rules, an override, an archived post, a percent split, a fixed split and a finance plan). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Budget 2.0
A personal budgeting PWA. Envelope-style monthly budgets with rollover, split purchases, finance plans, multi-currency, and JSON/ODS export. All data lives in your browser — there is no server and no account.
Development
bun install
bun --hot src/index.ts # dev server with hot reload
bun test # run the test suite
bun run build # production build into dist/
Self-hosting with Docker
docker build -t budget2 .
docker run --rm -p 3000:3000 budget2
To serve from a subpath, build and run with BUN_PUBLIC_BASE_PATH:
docker build -t budget2 --build-arg BUN_PUBLIC_BASE_PATH=/budget/ .
docker run --rm -p 3000:3000 -e BUN_PUBLIC_BASE_PATH=/budget/ budget2
GitHub Pages
Pushing to main builds and deploys to Pages automatically, using
/<repository-name>/ as the base path. Enable Pages with "GitHub Actions" as
the source in the repository settings.
Your data
Everything is stored in this browser's IndexedDB. Export regularly from Settings → Your data: the JSON export is both your backup and how you move your budget to another device. Import replaces everything and downloads a backup of your current data first.
Known limitations
- Data is per-browser. There is no account and no sync. If you clear this browser's site data, or move to a different browser or device, your budget is gone unless you exported it first. The JSON export is not just a nice-to-have backup — it is the only way to move a budget between devices.
- The install prompt is incomplete.
manifest.webmanifestcurrently only ships an SVG icon. Chrome requires PNG icons at 192×192 and 512×512 to offer the "Install app" prompt; until those are added, the app works fine as a regular tab but won't be installable on Chrome/Chromium.
Documentation
- Design:
docs/superpowers/specs/2026-09-01-budget-app-design.md - Implementation plan:
docs/superpowers/plans/2026-09-01-budget-app.md