HN – Show HN: DailyNote – one-note-per-day app with local-first encryption

Hi HN and Happy New Year!

I built DailyNote, a minimalist daily notes app: one note per day, a year-at-a-glance calendar, and local-first storage.

The interesting bit is the encryption + sync model:

  - Notes are always encrypted locally before syncing to Supabase.
  - A dedicated data key (DEK) encrypts notes; your password only wraps that DEK (KEK).
  - So when you change your password, it just re-wraps the DEK — no re-encryption of note data.

I built the whole project in one day using Claude + Codex with a spec‑driven approach (tight PRD → implementation). It’s React/TypeScript, IndexedDB for local persistence, and optional cloud sync.

Demo: https://dailynote.xyz/

Repo: https://github.com/katspaugh/dailynote

Would love feedback on the crypto model, UX, or anything else.

Show HN: DailyNote – one-note-per-day app with local-first encryption

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