Frequently asked questions

What is Hjarni?

A simple knowledge base that gives ChatGPT and Claude long-term memory. Write notes in Markdown. Connect your AI via a built-in MCP server.

How does Hjarni work?

You write notes. Your AI reads them. Hjarni has a built-in MCP server — ChatGPT and Claude search, read, and create notes directly. No plugins. No export steps.

Is this just another note-taking app?

No. It's a note-taking app your AI can actually use. Your notes become live context for every AI conversation.

Who is Hjarni for?

Anyone tired of re-explaining context to their AI. Developers, researchers, founders, writers, and teams.

What does Hjarni mean?

Old Norse for brain. It's what the product does — give your AI a brain it can use across conversations.

What's MCP?

Model Context Protocol. An open standard that lets AI assistants connect to external tools and data. Hjarni has a built-in MCP server. Your AI reads and writes your notes directly.

Which AI assistants work with Hjarni?

ChatGPT and Claude connect via MCP today. Any AI that supports MCP will work automatically. Others can use the REST API.

How do I give my AI a memory?

Add Hjarni as an MCP server in ChatGPT or Claude. Takes two minutes. Every conversation picks up where the last one left off.

Can I control how my AI uses my notes?

Yes. Set custom AI instructions on any folder, team, or your whole account. Your AI follows your conventions. Not its defaults.

Does Hjarni have its own AI?

No. You bring your own. That means no per-message costs, no token limits, no surprises on your bill.

Does Hjarni work with Gemini?

Not yet. Gemini doesn't support MCP yet. When it does, it will work with Hjarni automatically.

Why not Notion or Obsidian?

Great tools. Different goals. Hjarni is built from the ground up for AI. Custom instructions per folder. Team-wide AI conventions. An MCP server designed around your knowledge — not bolted onto a workspace.

Which note-taking apps have a native MCP server?

Hjarni and Notion both ship with one built in. No plugins, no manual export, no copy-paste.

Can I collaborate with others?

Yes. Create a team, invite members, share folders. Everyone's AI benefits from the shared knowledge.

Does Hjarni support file attachments?

Yes, on the Pro plan. PDFs, images, documents. Drop them on any note.

Is Hjarni free?

Yes. 25 notes with full API and MCP access. No trial. No expiration.

How much does Pro cost?

Starts at €9/month. Unlimited notes and file attachments.

How much does Teams cost?

Starts at €12/seat/month. Shared knowledge base with member management.

What happens to my data?

Your notes live on our servers. Export everything as Markdown anytime. We don't train AI on your data. We don't sell it. It's yours.

Can I export my notes?

Yes. Export everything as Markdown in a ZIP. Anytime. No lock-in.

Can I self-host Hjarni?

Not currently. It's a hosted service. That keeps things simple — for you and for us.