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Notes your AI can read and write

Short answer

Hjarni is a knowledge base with a built-in MCP server. Connect ChatGPT and Claude to search, read, and update the same saved notes. In a new conversation, ask your assistant to check Hjarni for the context you need.

Give your AI a memory

Free to start. No credit card.

The problem with normal notes

Your notes are in one app. Your AI is in another. When your assistant cannot reach your current notes, you can end up pasting the same background, re-explaining preferences, and copying context out of an old chat.

The fix is not a better note app. It is notes your assistant can actually reach.

How it works

Save your notes in Hjarni, then connect it to ChatGPT or Claude with the built-in MCP server. Ask your connected assistant to search, read, or update the notes you need. It retrieves saved context through Hjarni's tools; connecting does not automatically load your notes into every conversation.

See it work

You, in ChatGPT

"Save a note in Hjarni: the family reunion is in Porto, first weekend of August."

ChatGPT

"Saved to Hjarni."

You, a week later, in Claude

"Search Hjarni for the family reunion note, read it, and help me plan the weekend."

Claude

"I read your reunion note: Porto, first weekend of August. Here is a plan for those two days."

One note. Written by ChatGPT, read by Claude. That is the point: the notes are the shared memory, not the chat.

Simple on purpose

Hjarni keeps the shape small: notes, folders, tags. That is enough structure for you to organize notes and for connected ChatGPT and Claude to read, search, and update them.

What is left out matters. No databases, no kanban boards, no page builders. Those are useful in other products. They make a knowledge base heavier than it needs to be.

Your notes stay plain Markdown you own and can export. The point is not to model everything. The point is to keep durable context in a form both people and AI can understand.

Where you write it is up to you: any browser, or the free apps for iPhone, iPad and Mac and Android. Same account, same notes. Your connected assistant can retrieve notes you created in any of these apps.

Built-in AI memory is not enough

Built-in memory is useful for small preferences. A knowledge base is for context you want to keep, inspect, edit, and share across ChatGPT and Claude.

Built-in memory Knowledge base you own
Usually stays inside one assistant. ChatGPT and Claude do not share the same memory by default. Portable across assistants. Connected ChatGPT and Claude can retrieve the same notes through the built-in MCP server.
You can view some saved items, but it is not a Markdown knowledge base you edit like normal documents. You can open, edit, rename, tag, and file the memory yourself.
A memory saved in one assistant does not automatically survive when you work in the other. The note survives across both ChatGPT and Claude because it lives outside the chat.
Export is limited and product-specific. Export your knowledge base as Markdown when you want to leave.

Use both. Let built-in memory keep light preferences. Put the notes worth keeping in Hjarni. See Hjarni vs ChatGPT Memory for the longer comparison.

What you keep in your notes

Keep the context you would otherwise repeat. The small facts. The current plans. The decisions that explain why things are the way they are.

Preferences

How you like answers written, what you avoid, what matters when options are close.

Trip details

Dates, bookings, places to revisit, dietary notes, and the kind of pace you prefer.

People

Who someone is, what you last discussed, and details you want to remember next time.

Ongoing projects

Goals, open questions, constraints, next steps, and useful background.

Decisions

What you chose, why you chose it, and what would make you revisit it.

Reference notes

Ideas, quotes, checklists, plans, and anything ChatGPT and Claude should be able to find later.

Start with one note

You do not have to import anything or set up folders first. Connect Hjarni, then tell your assistant one thing worth remembering. Paste this into ChatGPT or Claude once you are connected:

Save a note in Hjarni about who I am and how I like you to work with me. In future conversations, search Hjarni and read this note when you need that context.

That first note is the whole idea in miniature. Ask your assistant to save it, then start a new conversation and ask it to search Hjarni and read the note back. From there you add notes, folders, and tags as you go. It is plain Markdown you own and can export anytime.

Give your AI a memory

Common questions

Common questions

What are notes ChatGPT and Claude can read and write?

Notes stored in a knowledge base with a built-in MCP server. Once you connect it, ChatGPT and Claude can search your notes, read them, create new ones, and update existing ones during a conversation. Hjarni is one: plain Markdown notes, folders, and tags, with the MCP server built in.

How is this different from Apple Notes or Google Keep?

Hjarni's distinction is its built-in, hosted MCP server. Connect ChatGPT and Claude to the same knowledge base and ask either to retrieve or update notes. You can also read and edit those notes yourself, and export them as Markdown.

Does ChatGPT remember my notes between chats?

Your notes persist in Hjarni between chats. Connected ChatGPT and Claude can retrieve them when they use Hjarni's tools. In a new conversation, ask your assistant to search Hjarni and read the relevant notes. Connecting does not automatically load every note into every chat.

Do I have to organize my notes myself?

You can ask connected ChatGPT or Claude to save and file notes for you. Folder-level instructions can guide its choice of folder, tags, and format. Check the saved note to make sure it followed your conventions; instructions do not guarantee every edit.

Is it free to start?

Yes. The free tier includes full MCP access with no token limits and no credit card. Save notes, connect ChatGPT and Claude, and see if it fits before you pay for anything.

Start here

Write once. You both remember.

25 notes free, forever. No credit card required.

5 out of 5 from 14 reviews 9,800+ notes a day read or updated by AI

Works with Claude, ChatGPT, Cursor and any MCP client.