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

> Source: <https://github.com/inkeep/open-knowledge>
> Published: 2026-06-25 16:04:46+00:00

OpenKnowledge is a beautiful, local-first markdown editor and LLM wiki with integrations for Claude, Codex, and other harnesses.

Available as [macOS app](https://github.com/inkeep/open-knowledge/releases/latest/download/Open-Knowledge-arm64.dmg) or [Web app/CLI](https://openknowledge.ai/docs/get-started/quickstart#ok-install-web-app-linux-windows-intel-mac) 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](https://openknowledge.ai/docs).

**macOS:** download the desktop app — open the DMG, drag **OpenKnowledge** to **Applications**, and launch it. [Latest release](https://github.com/inkeep/open-knowledge/releases/latest).

**Linux, Windows, Intel Mac:** run the same editor as a local web app via the CLI ([Node.js 24+](https://nodejs.org) 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](/inkeep/open-knowledge/blob/main/CONTRIBUTING.md) for details.

OpenKnowledge is licensed under the [GNU General Public License v3.0 or later](/inkeep/open-knowledge/blob/main/LICENSE) (`GPL-3.0-or-later`

).