The short version
Hjarni is a note-taking app your AI can actually use. Write notes in Markdown. Organize them in folders. Connect ChatGPT or Claude via a built-in MCP server. Your AI reads your notes and follows your instructions. Every conversation picks up where the last one left off.
The problem it solves
Every AI conversation starts from zero. You explain your project. Your preferences. Your decisions. Then the conversation ends and it all disappears. Next time, you start over.
Hjarni fixes that. Your notes become your AI's memory. No copy-pasting. No re-explaining. Just context that persists.
How it works
1. Write notes
Plain Markdown. Folders, tags, wiki-links. Organize however your brain works.
2. Connect your AI
Add Hjarni as an MCP server in ChatGPT or Claude. Takes two minutes. No plugins, no code.
3. Your AI remembers
Every conversation starts with your context. Your AI searches your notes, reads them, and creates new ones. The loop closes itself.
What makes it different
- AI-native, not AI-added. The MCP server isn't a plugin bolted on. The app was built around it. Your AI doesn't just search your notes — it understands your structure and follows your instructions.
- Simple on purpose. No databases. No kanban boards. No page builders. Notes, folders, and a connection to your AI. The constraint is the feature.
- You own the instructions. Set custom AI instructions per folder, per team. Your AI follows your conventions. Not its defaults.
- No bundled AI. You bring your own. No per-message costs. No token limits. No surprises on your bill.
Who uses Hjarni
Architecture docs, conventions, debugging playbooks. Your AI knows your stack.
Literature notes, hypotheses, synthesis docs. Your AI helps you think.
Strategy, meetings, decisions. Your AI knows your company.
Style guides, research, drafts. Your AI writes like you.
What does "Hjarni" mean?
Hjarni is an Old Norse word meaning brain or mind. It's what the product does: give your AI a brain it can use across conversations.
Most AI tools give you a chatbot. Hjarni gives your AI a brain.
Pricing
Free — up to 25 notes with full API and MCP access. No trial. No expiration.
Pro — $10/month. Unlimited notes and file attachments.
Teams — $13/seat/month. Shared knowledge base with member management.
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.
Who is Hjarni for?
Anyone tired of re-explaining context to their AI. Developers, researchers, founders, writers, and teams.
Is Hjarni free?
Yes. 25 notes with full API and MCP access. No trial. No expiration.
What does Hjarni mean?
Old Norse for brain. It's what the product does — give your AI a brain it can use across conversations.