Compatibility matrix
One knowledge base. Every MCP client.
Hjarni is a hosted MCP knowledge base with an official server. ChatGPT, Claude and other connected assistants can search, read, create and update the same Markdown notes, without a local server to maintain. Find your client’s setup guide.
What you and your assistants can do
Shared notes, with history and Markdown export.
- Search and read. Ask ChatGPT or Claude to find your notes and retrieve their full current content. Search and read tools.
- Create and update. Save new Markdown notes and edit existing ones from either assistant. Read and write workflow.
- Review and restore. See who saved each version, compare note bodies and restore an earlier whole body. History and recovery.
- Export your notes. Download active notes and attachments from Hjarni as a Markdown ZIP. Sample export and export limits.
Follow wiki-links and backlinks, and give assistants per-folder instructions.
Swipe the table sideways for setup guides →
| Client | Type | Connection | Auth | Setup |
|---|---|---|---|---|
| Claude.ai & Claude Desktop | Web, desktop, mobile | Remote MCP | OAuth | Guide |
| ChatGPT | Web, desktop, mobile | Remote MCP | OAuth | Guide |
| Perplexity | Web | Remote MCP | OAuth | Guide |
| Meta Muse app | Web, mobile | Custom REST connector | API token | Guide |
| Cursor | IDE | Remote MCP | OAuth | Guide |
| GitHub Copilot (VS Code) | IDE | Remote MCP | OAuth | Guide |
| Windsurf | IDE | Remote MCP | OAuth | Guide |
| Cline | IDE (VS Code) | Remote MCP | OAuth | Guide |
| Zed | IDE | Remote MCP | OAuth | Guide |
| Continue.dev | IDE (VS Code, JetBrains) | Remote MCP | OAuth | Guide |
| Junie | IDE (JetBrains) | Remote MCP | OAuth | Guide |
| Claude Code | CLI | Remote MCP | CLI + OAuth | Guide |
| Muse Code | CLI | Remote MCP | OAuth / API token | Guide |
| Aider | CLI | Remote MCP | OAuth | Guide |
| Gemini CLI | CLI | Remote MCP | OAuth | Guide |
| Gemini app (Spark) | Web, mobile | Remote MCP | OAuth | Guide |
| Goose | CLI, desktop | Remote MCP | OAuth | Guide |
| Microsoft Copilot Studio | Agent builder | Remote MCP | OAuth | Guide |
| OpenClaw | Open-source agent | Remote MCP | OAuth | Guide |
| Open WebUI | Self-hosted chat | Remote MCP | OAuth | Guide |
| LibreChat | Self-hosted chat | Remote MCP | OAuth | Guide |
| Jan | Desktop app | Remote MCP | OAuth | Guide |
| LM Studio | Desktop app | Remote MCP | OAuth | Guide |
| Raycast | Mac launcher | Remote MCP | OAuth | Guide |
| Alfred | Mac launcher | REST API | API token | Guide |
| Obsidian | Note app (sync) | REST API | API token | Guide |
| Zapier | Automation | REST API | API token | Guide |
| n8n | Automation | Remote MCP | OAuth | Guide |
| Any MCP client | Custom | Remote MCP | OAuth | Guide |
Remote MCP clients reach the same hosted server over OAuth. REST API clients use a personal API token. Both read and write the same notes.
Keep client context across ChatGPT and Claude
Connect each assistant to the same Hjarni account using the guides above. Keep the agreed context in a note both can read and update.
- Save a client brief in ChatGPT. Use the Client Project Context template for preferences, scope, dated decisions, status and next actions. Keep one brief per client and project.
- Read and update it in Claude. Ask Claude to retrieve the full brief and link to it. Clarify ambiguous matches and leave missing details unknown. Draft changes in chat first, then confirm saving them to the same note while preserving the rest.
- Check it in a fresh ChatGPT chat. Ask ChatGPT to retrieve that brief again. Open the source link and verify the updated status and next action.
The recorded freelancer walkthrough shows ChatGPT saving a fictional client brief, Claude updating it, and a fresh ChatGPT chat checking the change.
Each assistant must retrieve the notes; a connection does not guarantee recall in every chat. Client folders organize briefs. To restrict access, limit each assistant to the client folders it should reach at sign-in or in Settings > Connections; you can also make it read-only. Follow the folder-access walkthrough to check the boundary.
Review changes and keep a copy
- Note history and recovery lets you compare note bodies and restore an earlier whole body as a new version. Current titles, folders and other fields stay unchanged; later body edits you want to keep may need reapplying. Deleted notes are recoverable from Trash for 30 days.
- Export and ownership explains how to download active notes and attachments as a Markdown ZIP, with a sample you can inspect. The standard ZIP excludes archived and trashed notes, revision history and folder instructions.
Using a client that is not listed?
If it speaks MCP, it works.
The remote MCP endpoint is https://hjarni.com/mcp with OAuth. Config shapes vary by client (some want url, some want serverUrl, some use a CLI). The general connection guides cover the patterns, the MCP Config Validator sanity-checks a config before you save it, and the MCP server reference documents every tool.
Free to start. No credit card required.
Your notes on every device
Hjarni has its own native apps. Free on every plan for iPhone, iPad and Mac and Android. Same account, same notes as the web. An internet connection is required.
Start here
Write once. You both remember.
25 notes free, forever. No credit card required.
Works with Claude, ChatGPT, Cursor and any MCP client.