SiYuan
SiYuan is a free, open-source notes and writing app for Windows, macOS and Linux. An open-source, privacy-first, self-hosted knowledge workspace where humans and AI agents work together 开源、隐私优先、自托管的知识工作空间，让人与智能体在此协作. It has 46,669 GitHub stars and is released under the AGPL-3.0 license, and people use it instead of Notion and Obsidian.
- Official
- Linux
- macOS
- Windows
- Notes & writing
- Actively maintained
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What is SiYuan?
SiYuan is a free, open-source notes and writing app for Windows, macOS and Linux. An open-source, privacy-first, self-hosted knowledge workspace where humans and AI agents work together 开源、隐私优先、自托管的知识工作空间，让人与智能体在此协作. It has 46,669 GitHub stars and is released under the AGPL-3.0 license, and people use it instead of Notion and Obsidian.
Is SiYuan free and open source?
Yes. SiYuan's source code is public on GitHub under the AGPL-3.0 license, which is OSI-approved or FSF-free, so you can use, copy and change it for free.
How do I install SiYuan?
Download the installer for Windows, macOS and Linux from its GitHub Releases page (latest: v3.8.6) or the project website.
Can SiYuan replace Notion?
SiYuan is commonly used as a free alternative to Notion and Obsidian. Features differ, so check that it opens the file formats and covers the workflows you rely on before switching.