# SiYuan (open-source notes app)

> SiYuan is a free, open-source notes app for Android. Open-source knowledge workspace for humans and AI agents. It has 480 GitHub stars and is released under the AGPL-3.0-only license, and you can install it from F-Droid and Google Play.

SiYuan is an open-source, privacy-first, self-hosted knowledge workspace where humans and AI agents work together. Features Most features are free, even for commercial use. Content block Block-level reference and two-way links Custom attributes SQL query embed Protocol siyuan:// Editor Block-style Markdown WYSIWYG List outline Block zoom-in Block horizontal layout Million-word large document editing Mathematical formulas, charts, flowcharts, Gantt charts, timing charts, staffs, etc.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/siyuan-note/siyuan-android |
| Platforms | Android |
| Built with | Java |
| GitHub stars | 480 |
| License | AGPL-3.0-only (open source) |
| F-Droid | https://f-droid.org/packages/org.b3log.siyuan/ (package org.b3log.siyuan) |
| F-Droid anti-features | none flagged |
| Google Play | https://play.google.com/store/apps/details?id=org.b3log.siyuan |
| App Store | not linked |
| Website | https://b3log.org/siyuan/ |
| Official | no |
| Category | Notes & to-do |
| Latest release | none on GitHub |
| Last commit | Oct 7, 2026 |

F-Droid builds its apps from source and flags anti-features: https://f-droid.org/en/docs/Anti-Features/

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