SiYuan

SiYuan is a privacy-focused personal knowledge management system that supports fine-grained block-level citations and Markdown WYSIWYG editing, aiming to help users efficiently manage and organize information.

The vast majority of the software’s features are available for free and are even suitable for commercial use. Key features include content blocks, two-way linking, custom attributes, SQL query embedding, math formula and chart support, PDF annotation linking, export to standard Markdown, database management, flashcard interval repetition, AI writing, and Q&A.

SiYuan’s architecture supports multi-platform use, including desktop (Windows, macOS) and mobile (Android, iOS, HarmonyOS), and can be deployed via Docker. Users can find plugins and templates in the community marketplace to enhance the app’s functionality.

SiYuan is fully open-source, encouraging contributions and participation, and users can communicate through the official forum and Discord community. To use all features, users can choose a paid membership for more privileges. SiYuan provides users with a flexible and powerful knowledge management tool for users who want to improve their personal management efficiency.