# SiYuan (open-source notes and writing app)

> 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.

SiYuan is a privacy-first personal knowledge management system, supporting fine-grained block-level reference and Markdown WYSIWYG.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/siyuan-note/siyuan |
| Platforms | Linux, macOS, Windows |
| Interface | desktop GUI |
| GitHub stars | 46,669 |
| License | AGPL-3.0 (open source) |
| Replaces | Notion, Obsidian |
| Language | TypeScript |
| Website | https://b3log.org/siyuan |
| Official | yes (published by the project behind the app) |
| Category | Notes & writing |
| Latest release | v3.8.6 (Sep 29, 2026) |
| Last commit | Oct 4, 2026 |

## Install

Download a build for your system from the project's releases (https://github.com/siyuan-note/siyuan/releases) or website, or build it from source by following the README.

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