Find instantlyAlways in sync
A focused notes app for thinkers.
Markdown-first, tag-powered, and open to every integration.
Everything you need. Nothing you don't.
Caliu is opinionated about simplicity, yet generous about power.
Markdown editor
Just write. Headings, lists, and code blocks format as you type. No toolbars, no switching modes.
Tags, not folders
Nested, colour-coded, and searchable. One note can live under many tags. Finally, organisation that matches how you think.
Reminders
Pin a time to any note and Caliu will nudge you at the right moment, on every device you own.
Always in sync
Your notes don't travel. They're just already there. Mac, phone, web, everywhere at once.
Open API + MCP
Full REST API and MCP server built in. Connect Claude, Cursor, or your own scripts and make your notes programmable.
Your vibe, your ink
Ten hand-crafted themes in light and dark. Your notes, your vibe.