Hjarni is a knowledge base your AI can actually use.
Write notes in Markdown. Organize them in folders and tags. ChatGPT reads them directly through a built-in MCP server. No plugins. No pasting the same context into every conversation.
ChatGPT starts every conversation from zero. Connect Hjarni once and it stops asking. Ask questions across all your notes. Have ChatGPT write new notes, update old ones, and tag them the way you want.
Set instructions per folder to control how ChatGPT writes, formats, and tags. Share a folder with your team so everyone's AI works from the same knowledge base. Search across everything in one call.
Built on the same open MCP standard as Claude, so your knowledge base is not locked to one assistant.
Use it as your second brain, your project memory, your research library, or your team's shared context. Notes, folders, tags. That is the product. Simple on purpose.
Free to start. No credit card required.
How to use
- 1Add it in ChatGPT
Open Hjarni Notes in ChatGPT's Plugin directory (button above), select + to add it and sign in if asked.
- 2Use it in a chat
Type @ in the composer and pick Hjarni Notes, or start your message with its name. ChatGPT may also suggest it when it fits what you ask.
Skills 4
- Recall from Hjarni
Load relevant Hjarni context before work.
- Remember in Hjarni
Save durable knowledge to Hjarni.
- Runbook to Hjarni
Save a reusable runbook to Hjarni.
- Session log to Hjarni
Save an explicit session log to Hjarni.
Things to ask
- “What do my notes say about this?”
- “Remember this for next time”
- “Save a summary of what we just did”