Shinichiro Kato

Building monthlet — AI note app

About

Solo developer from Japan. Building monthlet — an AI-native note app for macOS where you just speak your mind and AI writes the whole note, layout and all. Local-first: every note is a plain HTML file you own. Interested in local-first software, PKM, and what note-taking looks like when AI does the formatting.

Links

Product

official LP

Badges

Tastemaker

Gone streaking

Gone streaking 5

Maker History

monthletThe note app where AI writes the note — layout and all
Aug 2026

🎉

Joined Product HuntJuly 22nd, 2026

Forums

•

4h ago

monthlet - The note app where AI writes the note — layout and all

Dump raw thoughts — bullets, fragments — and tell monthlet in plain language what you want. AI writes the whole note: banners, columns, tabs, real spreadsheets and live charts, layout chosen for you. Want a change? Just ask — only that part updates. Every note is a plain HTML file on your disk, opens in any browser, no lock-in. Bring your own AI key (Claude, OpenAI, or Gemini); your notes never touch our servers. Free and complete. macOS (Apple Silicon) today; Windows on the way.