Get Hjarni on every device
Hjarni is a knowledge base with a built-in MCP server. Use it in any browser, in the free apps for iPhone, iPad, Mac and Android, and inside Claude and ChatGPT. One account, one set of notes, everywhere.
Apps
On your phone and your Mac
The apps are free, with the same features as the web. Write a note in a queue, and the next time Claude or ChatGPT searches your notes, it is there.
iPhone and iPad
Capture a note, attach a photo from the camera, and search everything you have saved.
Free on the App Store. Needs iOS 16 or later.
Android
The same five tabs and the same notes as on iPhone. Photos and files attach from your phone too.
Free on Google Play. Needs Android 9 or later.
Mac
The iPhone and iPad app runs as a proper Mac window: the sidebar stays open, and Cmd-N starts a new note.
Needs an Apple Silicon Mac. In the Mac App Store, look under iPhone & iPad Apps.
Browser
In any browser
The web app
Everything works at hjarni.com, on any operating system. Nothing to install.
Free to start. No credit card required.
Chrome web clipper
Click the toolbar icon on any article. It opens a clean Markdown copy with the source link, ready to save to your Hjarni inbox.
Free in the Chrome Web Store.
AI assistants
Inside the assistant you already use
Hjarni is listed in both the Claude and ChatGPT directories, so connecting is an install, not a config file.
Claude
Open the listing, press Connect and sign in. Then click + in a conversation and switch Hjarni on under Connectors.
Works in Claude.ai, Claude Desktop and Claude on iOS.
ChatGPT
Open the listing, press Connect and sign in. Then pick Hjarni from the + menu in a conversation, or mention it with @.
The setup guide covers which ChatGPT plans support it.
Every other AI tool
Cursor, Claude Code, Copilot and 20+ other AI tools connect to the same notes over MCP, with a short setup for each.
Same account, same notes, whichever tool you pick.
Start here
Write once. You both remember.
Free to start. No credit card required.
Works with Claude and ChatGPT today.