# SiYuan

Privacy-first, self-hostable knowledge workspace with block-level references. SiYuan is free, with no paid plan attached, at b3log.org.

## Facts

- **Pricing tier:** Free
- **Works on:** macOS, Windows, Linux, iOS, Android, Self-hosted
- **Works in browser:** No
- **Region note:** Developed by China-based b3log; global downloads available

## Capabilities

- Privacy-first, self-hostable knowledge workspace with block-level references
- Built-in AI assistant using your OpenAI-compatible API
- Free and open source, developed in China with English UI
- Desktop, mobile and Docker

## FAQ

### What is SiYuan?

SiYuan is listed under AI Note-Taking & Docs, in the Productivity & Workflow category on Flocci AI Tools. Privacy-first, self-hostable knowledge workspace with block-level references. It is free, with no paid plan attached, and it lives at b3log.org.

### Is SiYuan free?

SiYuan is listed as fully free — there is no paid tier attached to it in the catalog. That makes it one of the 397 entries on Flocci AI Tools with no upgrade path built in.

### Can I use SiYuan in a browser, or is there an app?

SiYuan needs to be installed or self-hosted — it doesn't run in a browser tab. It is available on Mac, Windows, Linux, iOS, Android and self-hosting. Developed by China-based b3log; global downloads available

### What can SiYuan do?

SiYuan does 4 things the catalog singles out: Privacy-first, self-hostable knowledge workspace with block-level references; built-in ai assistant using your openai-compatible api; free and open source, developed in china with english ui; desktop, mobile and docker.

### What is the best free alternative to SiYuan?

AFFiNE is the closest free alternative: it sits in the same AI Note-Taking & Docs sub-category and is free. Blinko, Karakeep and Google AI Edge Eloquent also start free. The full list is on the alternatives page.

## Related

- [SiYuan alternatives](https://aitools.flocci.in/alternatives/siyuan)
- [AI Note-Taking & Docs](https://aitools.flocci.in/category/productivity-workflow/ai-note-taking-docs)
- [Best free AI note-taking and document tools](https://aitools.flocci.in/best/best-ai-note-taking-docs)
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Source: Flocci AI Tools — https://aitools.flocci.in/tool/siyuan

Facts last verified: October 2026