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Hjarni icon

Hjarni

The knowledge base for ChatGPT and Claude. Save notes once, connect via MCP, stop re-explaining context every conversation.

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Cost / License

  • Freemium (Subscription)
  • Proprietary

Application type

Platforms

  • Online
  • Software as a Service (SaaS)
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Hjarni information

  • Developed by

    BE flagHjarni

  • Licensing

    Proprietary and Freemium product.

  • Pricing

    Subscription that costs up to $12 per month + free version with limited functionality.

  • Alternatives

    21 alternatives listed

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  • Supported Languages

    • English
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What is Hjarni?

Hjarni gives ChatGPT and Claude reusable context across conversations. Save notes once, connect with MCP, and stop re-explaining the same background every time you open a new chat.

It's a clean, simple knowledge base built around three ideas:

Simple on purpose. No databases, no kanban boards, no page builders. Just notes, containers, tags, wiki-links, and search. The constraint is the feature.

One knowledge base for you and your AI. No syncing, no duplicate notes, no separate "AI memory" to maintain. Capture a thought on your phone in the Claude app, refine it in Claude Code, query it next week from ChatGPT. Same brain.

Your rules, not the AI's defaults. Set custom instructions per folder, per team, or account-wide. Your AI follows your conventions for tone, format, and tags.

Other essentials: full-text search, file attachments, an inbox for fast capture, wiki-links between notes, note versioning, Markdown export, shared team containers, and a full REST API alongside the native MCP server. ChatGPT and Claude work today via MCP; any MCP-compatible client works automatically.