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Show HN: OpenKnowledge – open source AI-first alternative to Obsidian/Notion

Hi HN, Nick here. We’re launching OpenKnowledge (https://openknowledge.ai/), a “what you see is what you get” markdown editor that has direct integrations with Claude, Codex, and other agents. Available as MacOS app or Web UI+CLI. Fully free/local and OSS.We built this because we wanted a Notion-like experience for writing and sharing markdown files across our team. Obsidian is the best alternative we tried, but found it doesn’t have a true WYSWIG UI and it didn’t integrate well with Claude/Code

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tech4you AI
June 26, 20261 min read
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OpenKnowledge is a beautiful, local-first markdown editor and LLM wiki with integrations for Claude, Codex, and other harnesses.

OpenKnowledge editor with an AI agent drafting a launch recap

Available as macOS app or Web app/CLI for Linux, Windows, Intel Mac.

Key highlights:

  • Full WYSIWYG so that editing markdown files feels like editing a Google Doc or Notion page.
  • Collaborative AI-editing with Claude, Codex, and Cursor desktop apps. Can be used with any harness/agent via MCP/CLI.
  • Out-of-the-box MCP, skills, and agentic search for LLM Wikis, agent second brains, and spec-driven development.
  • No-code Team Sharing and Auto-sync powered by git/GitHub under the hood.

Docs for general usage: https://openknowledge.ai/docs.

macOS: download the desktop app — open the DMG, drag OpenKnowledge to Applications, and launch it. Latest release.

Linux, Windows, Intel Mac: run the same editor as a local web app via the CLI (Node.js 24+ required):

npm install -g @inkeep/open-knowledge
cd your-project
ok init          # scaffold the project + wire up Claude Code, Cursor, and Codex
ok start --open  # serve the web editor and open it in your browser

Public pull requests are welcome. When a public PR opens here, automation mirrors it into the internal monorepo for review and merge.

See CONTRIBUTING.md for details.

OpenKnowledge is licensed under the GNU General Public License v3.0 or later (GPL-3.0-or-later).

Originally published on Hacker News (Best)

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Show HN: OpenKnowledge – open source AI-first alternative to Obsidian/Notion | tech4you