SiYuan

SiYuan is a privacy-first personal knowledge management system for notes, knowledge bases, and Markdown WYSIWYG writing. It uses content blocks with block-level references and two-way links, so notes can link at a finer level than whole pages.

The editor supports block-style editing, list outlines, block zoom-in, web clipping, PDF annotation links, formulas, charts, flowcharts, and Gantt charts. It exports standard Markdown with assets, PDF, Word, and HTML. Other tools include table-view databases, spaced-repetition flashcards, Tesseract OCR, SQL query embeds, templates, snippets, and AI writing or Q/A chat through the OpenAI API.

SiYuan is fully open source and written in TypeScript and Go. Apps are available from mobile app stores, Microsoft Store, B3log downloads, GitHub releases, and Docker. Docker hosting uses the b3log/siyuan image, a mounted workspace, port 6806, and an access authorization code. Data is saved in the workspace folder, with .sy document files in JSON format.