Exchange Notes

A language-learning PWA for five languages (English, 繁體中文, Español, Français, Italiano), with Yumi, a companion built in three.js. Next.js 16, React 19, Supabase and Vercel.

Production: https://exchange-notes-app.vercel.app. Merging to main deploys it.

npm install
npm run dev        # http://localhost:3000 (needs .env.local)
npx vitest run     # tests

• AGENTS.md: where things live, and the rules for working here.
• .claude/skills/verify/SKILL.md: how to check a change before pushing it.
• supabase/migrations/README.md: how to write a migration.
• native/apple/README.md: the iOS app and widget.