SiYuan

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.

Web clipping

PDF Annotation link

Export

Block ref and embed

Standard Markdown with assets

PDF, Word and HTML

Copy to WeChat MP, Zhihu and Yuque

Database

Table view