Show HN: OpenKnowledge – open source AI-first alternative to Obsidian/Notion
Not a plugin. OpenKnowledge embeds Claude, Codex, and Cursor agents directly into markdown editing—side-by-side, fully local, fully open source.
Why it matters
A new productivity layer built for AI-native workflows. OpenKnowledge positions itself as the markdown-first alternative to Obsidian/Notion that treats LLM agents as first-class citizens, not bolt-ons. This matters to founders and teams building on Claude/Cursor who need collaborative, agent-aware knowledge management.
The key facts
8 to knowMacOS app + CLI launch
Direct integrations with Claude, Codex, Cursor
Open source (GitHub: inkeep/open-knowledge)
WYSIWYG markdown editor with bidirectional ProseMirror-to-markdown conversion
Dual-observer CRDT for collaborative agent transparency and version history
Built-in MCPs, RAG, and 'AI Second Brain' scenarios
Fully local, no cloud lock-in (git/GitHub for sync)
Tech stack: Tiptap/ProseMirror, CodeMirror, Yjs, Electron, Orama, remark/rehype
Go to the source
Hacker Newsgithub.com
Publisher excerpt: 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 Cursor. Available as MacOS app or CLI. Fully free/local and OSS ( We built this because we wanted a “Google docs” like…