Most AI tools give you a chatbot. Hjarni gives your AI a brain.

It's a clean, simple knowledge base with a built-in MCP server. Your notes live in folders and tags, written in Markdown. Claude and ChatGPT can read every note, follow your instructions, and update your structure through the Model Context Protocol. Stop re-explaining yourself. Write once, you and your AI both remember.

The product is deliberately small. No databases. No kanban. No page builders. Notes, folders, tags. That's it. The constraint is the feature.

Built by one person. I'm Evert, a solo developer in Belgium, building Hjarni alongside a full-time role at Goboony. Shipping publicly since March 2026.

Free to start. €9 per month for Pro. No trials, no credit card required.