What is siyuan?
An open-source, privacy-first, self-hosted knowledge workspace where humans and AI agents work together 开源、隐私优先、自托管的知识工作空间，让人与智能体在此协作
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Availability and pricing verified on 17 Sept 2026 from the official source. Official page: 思源笔记 - 隐私优先的个人知识管理系统，支持 Markdown 排版、块级引用和双向链接.
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