Write freely
Find instantly
Always in sync
A focused notes app for thinkers.
Markdown-first, tag-powered, and open to every integration.
No credit card required · Free tier forever
Everything you need. Nothing you don't.
Caliu is opinionated about simplicity — and generous about power.
Markdown editor
Write with a distraction-free Markdown editor. Format as you type with live preview and syntax highlighting.
Tags
Organise every note with tags — nested, colour-coded, searchable. No folders. No clutter.
Reminders
Set a reminder on any note. Get notified at exactly the right time, wherever you are.
Instant sync
Your notes appear everywhere the moment you save them. Web, iOS, Mac — always up to date.
Open API + MCP
Full REST API and MCP server. Connect AI agents like Claude or OpenClaw, build automations, integrate anything.
Multi-platform
Native apps for Mac, iPhone, and iPad. Works in any modern browser. Your notes travel with you.
For developers
Your notes,
programmable
Full REST API and MCP server included. Connect AI agents, automate workflows, or build custom integrations.