Caliu - A notes app

Caliu is a markdown notes app for people who actually write. No clutter, no toolbars in the way, no popups asking you to upgrade. Just a calm canvas, your text, and the things you need to find it again later.

It runs natively on iPhone, iPad, and Mac, and stays in sync with the web app at web.caliuapp.com. Everything works offline: your notes live on your device first, and travel only when there's a connection.

• Write in markdown, see the result
Headings, lists, quotes, code blocks and links format as you type. No preview pane, no switching modes. The interface gets out of the way so the writing can take over.

• Tags, not folders
Nest them, color them, search them. A note can live under as many tags as you want. Organisation that matches how your brain actually works.

• Reminders that find you
Pin a time to any note and Caliu will nudge you on every device you own — iPhone, iPad, Mac. Useful for the things you'll otherwise forget you wrote down.

• Sync that you don't think about
Open Caliu on your Mac, keep going on your phone. Your notes are already there. No sync button, no spinning wheel, no waiting.

• Themes worth living in
Ten color themes, each with its own font trio for UI, prose, and code. Light and dark variants. Pick one that suits the way you read. Switch whenever the mood changes.

• Backlinks and links between notes
Connect notes the way you'd connect ideas. Caliu tracks who points where, so the web you're building stays visible.

• Export, share, own your work
Export any note as Markdown, plain text, HTML, ePub, or RTF. Share a note as a public link when you want someone else to read it. Your notes are yours — there's nothing locking you in.

• Built for people who tinker
Caliu has a full REST API and a built-in MCP server. Connect Claude, Cursor, your own scripts, or whatever else you build with. Notes you can program against.

• Made with care
Caliu is a small, independent project. No tracking circus, no AI features bolted on for the press release. Just a tool meant to be used every day.