SiYuan is a privacy-first personal knowledge management system, support fine-grained block-level reference and Markdown WYSIWYG. <h3>Features</h3> Most features are free, even for commercial use. <ul> <li>Content block <ul> <li>Block-level reference and two-way links</li> <li>Custom attributes</li> <li>SQL query embed</li> <li>Protocol <code>siyuan://</code></li> </ul> </li> <li>Editor <ul> <li>Block-style</li> <li>Markdown WYSIWYG</li> <li>List outline</li> <li>Block zoom-in</li> <li>Block horizontal layout</li> <li>Million-word large document editing</li> <li>Mathematical formulas, charts, flowcharts, Gantt charts, timing charts, staffs, etc.</li> <li>Web clipping</li> <li>PDF Annotation link</li> </ul> </li> <li>Export <ul> <li>Block ref and embed</li> <li>Standard Markdown with assets</li> <li>PDF, Word and HTML</li> <li>Copy to WeChat MP, Zhihu and Yuque</li> </ul> </li> <li>Database <ul> <li>Table view</li> </ul> </li> <li>Spaced repetition</li> <li>Multi-tab, drag and drop to split screen</li> <li>Template snippet</li> <li>JavaScript/CSS snippet</li> <li>Android/iOS APP</li> <li>Docker deployment</li> <li>API</li> <li>Community marketplace</li> </ul> Some features are only available to paid members, for more details please refer to Pricing.