Write to someone who doesn't exist yet.
A quiet place to write one letter to the future, your future self, a child not yet here, a stranger in 2126. An old book floats in a bright, star-drifted sky; open it and its pages shuffle across the screen until one becomes yours. Write, choose the day it opens, and seal it. Your letter becomes a small gold light in the sky, waiting.
A letter is a chrysalis: it goes in as now and comes out as someday.
- The sky (
/), the book, the shuffle, the letter, the seal. - Your letters (
/letters), the vault: every letter with its countdown; letters whose day has come glow and open. Plus three letters from the past (1936 · 1972 · 1999). - Why (
/why), the case for writing forward, written as a letter. The full essay ships as PAPER.md.
- Private by design, letters live on your device. No servers, no accounts, no analytics.
- Letters outlive letterboxes, every sealed letter downloads as a single self-contained HTML file that opens itself on its date, with no website or company required. The seal is a promise, not a prison, the way envelopes always worked.
npm install
npm run dev # http://localhost:3000
npm test # letter store, time words, keepsake, 10 tests
npm run build # static exportNo environment variables, no database, no keys.
Next.js 15 (static export) · Tailwind v4 · Fraunces & Newsreader · every animation is CSS
transforms and opacity, and everything respects prefers-reduced-motion. The only logic, the letter store, time words, and the keepsake generator, lives in
src/lib/letters.ts with its tests beside it.