Hjarni Notes: AI Memory
Second brain for Claude & GPT
Free · In‑App Purchases · Designed for iPad
Your AI starts from zero every conversation. Hjarni fixes that.
Write a note on your phone. Ask Claude or ChatGPT about it on your laptop, and it already knows.
Hjarni is a Markdown knowledge base with a built-in MCP server. Notes, folders, tags. That is the whole product. MCP is not a plugin bolted on afterwards. The app was built around it.
HOW IT WORKS
Save a note once. Connect Claude, ChatGPT, or any MCP client. Your AI reads your notes, follows your instructions, and writes new notes that fit your system.
Stop re-explaining your stack, your customers, or your style guide at the start of every conversation. Write once. You both remember.
ON YOUR IPHONE
Capture a note in seconds from the New tab. Triage it later from the Inbox. Search everything you have written. Read anywhere.
This is the capture and read-anywhere companion. The long editing sessions happen on the web. That is on purpose.
ONE BRAIN, EVERY ASSISTANT
Claude and ChatGPT each keep their own memory, and neither one shares. Hjarni sits outside both. Switch assistants, keep your context. Works with Claude, ChatGPT, Claude Code, Cursor, and anything else that speaks MCP.
MEMORY YOU CAN ACTUALLY READ
Assistant memory is a black box. Hjarni is not. Every note is plain Markdown you can open, search, and edit. Every change is versioned, so you can see what your AI wrote, diff it, and revert it. Export everything, any time, in a format that opens anywhere.
SHARE A BRAIN WITH YOUR TEAM
Team folders give everyone the same context. Your conventions, your decisions, your onboarding docs. Every teammate's AI reads the same thing, so nobody has to be the person who remembers.
YOU OWN THE INSTRUCTIONS
Set instructions per folder and per team. Tell your AI how to format notes, which tags to use, what tone to write in. Your AI works the way you work.
SIMPLE ON PURPOSE
We left features out on purpose. No databases. No kanban boards. No page builders. Hjarni is a place to write and organize. The constraint is the feature.
WHO IT IS FOR
Developers, teams, founders, researchers, writers, travelers. Anyone who has typed the same context into a chat window twice.
HJARNI PRO
Hjarni is free to use, with a limit on how many notes you can keep. Pro removes the limit and adds file attachments, imports, email capture, and folder collaborators.
Pro is an auto renewing subscription, monthly or annual. Payment is charged to your Apple Account at confirmation of purchase. It renews unless you turn off auto renew at least 24 hours before the end of the current period, and your account is charged for the renewal within 24 hours before that. Manage the subscription and turn off auto renew in your Apple Account settings.
Terms of Use (EULA): https://hjarni.com/terms
Privacy Policy: https://hjarni.com/privacy
Ratings & Reviews
Share a public link straight from the app. Once a folder or note has a public link, Share link opens the share sheet, so you can send it to Messages, Mail or anywhere else.
Moving around Settings is simpler: switching between General, Security, Billing and Connections no longer piles up screens behind the back button, and General always takes you back to the start.
Fixed a tab that could come back as a blank page after the app had been in the background for a while.
The developer, evert van den bruel, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- User Content
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- evert van den bruel
- Size
- 3.7 MB
- Category
- Productivity
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - iPad
Requires iPadOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Hjarni Pro Yearly $119.99
- Hjarni Pro Monthly $11.99
- Copyright
- © 2026 Evert van den Bruel
