monthlet

monthlet is a note-taking app for macOS on Apple Silicon. You dump raw thoughts, say what you want in plain language, and the AI writes the note, choosing banners, columns and tabs automatically; later edits are requested in the same way and only that part updates. Notes are stored as plain HTML files on the machine, so they stay readable with or without the app. Beyond notes it builds spreadsheets, charts bound to sheet data, diagrams, and meeting or weekly review templates. It supports Claude, ChatGPT and Gemini keys, connects to Google Sheets and Google Calendar, and can act as an MCP server so outside agents read notes through the app.