Hjarni

Reusable context for ChatGPT and Claude

evert·Published on Sep 18, 2026·0 reputationReputation invested into this product to boost its ranking. Anyone can spend the reputation they've earned here — recent investments count for more and lift the product higher on the leaderboard. This is separate from community upvotes.

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About Hjarni

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

Hjarni is a clean, simple knowledge base with a built-in MCP (Model Context Protocol) server. Claude and ChatGPT can read your notes, follow your instructions, and remember what you told them — across every conversation, every session, every device. Stop repeating yourself. Start building a knowledge base that works twice: once for you, once for your AI.

The problem it solves

Every time you open a new chat with Claude or ChatGPT, it starts from zero. You re-explain your project, re-state your preferences, re-paste the same context you shared last week. Hjarni fixes that. Your notes become your AI’s long-term memory — persistent, searchable, and always up to date.

What makes it different

MCP isn’t a plugin bolted on. Hjarni was built around it from day one. Your AI doesn’t just search your notes — it understands your folder structure, follows custom LLM instructions you set per container, and writes notes that fit your personal system. Connect once via OAuth, and any MCP-compatible agent can read and write to your knowledge base from anywhere.

Unlike local-first tools like Obsidian with a filesystem MCP, Hjarni is hosted. That means your notes are reachable from every runtime, every device, and every AI agent — not just the one on your laptop.

Key features

Built-in MCP server, no setup beyond OAuth
Hierarchical containers with per-folder AI instructions
Full-text search, tags, and bidirectional note links
Works with Claude, ChatGPT, and any MCP-compatible agent
Clean markdown editor — no databases, no kanban, no page builders
Team plans for shared knowledge bases
Free tier with full MCP access, no credit card required

Who uses it

Developers use it to stop re-explaining their codebase to AI every session. Founders use it to keep project context, decisions, and research alive across long-running conversations. Researchers use it to build a personal knowledge base their AI assistant can actually query. Anyone who talks to AI daily uses it to give their assistant a persistent memory that survives every new conversation.

Pricing

Free tier: 25 notes with full MCP and API access. Pro: €9/month for unlimited notes and 2 collaborator slots. Team: €12/seat/month for shared knowledge bases and member management

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