Siyuan

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Siyuan is a privacy-first, self-hosted personal knowledge management software. It supports fine-grained block-level reference and Markdown WYSIWYG, with features like AI writing and OCR.

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At a glance

Pricing

Freemium · Open Source

Free tier

Yes

API

Yes

Skill level

Technical

About

What is siyuan?

Siyuan is a fully open-source, privacy-first personal knowledge management system designed for self-hosting. It offers fine-grained block-level referencing and two-way links, along with a Markdown WYSIWYG editor. Key features include block zoom-in, million-word document editing, support for mathematical formulas, charts, and diagrams, and web clipping. The software also integrates AI writing and Q&A chat via OpenAI API, Tesseract OCR, and spaced repetition flashcards. It supports multi-tab interfaces, drag-and-drop split screens, and template snippets, making it a comprehensive tool for organizing and connecting ideas.

Best used for

Ideal for developers and students who need to manage personal knowledge, organize notes with block-level references, and utilize AI for writing and Q&A. Especially valuable for those seeking a privacy-first, self-hosted solution with advanced editing and learning features.

Common actions

manage knowledge

organize notes

write documents

enhance learning

self-host data

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Capabilities

Key features

Block-level reference
Markdown WYSIWYG editor
AI writing/Q&A chat
Tesseract OCR
Spaced repetition
Docker deployment
Multi-tab interface

Target Audience

developerstudentwritercontent creator

Integrations

openai

Pricing & Plans

Freemium · Open Source

Free

FAQs

How does Siyuan store user data?

Siyuan stores data in a workspace folder on your local system. This folder contains assets, emojis, snippets, storage for queries and layouts, templates, widgets, plugins, and notebook folders with .sy files in JSON format for document data.

Does Siyuan support data synchronization with third-party sync disks?

No, Siyuan does not support data synchronization through third-party sync disks to prevent data corruption. However, it does support connecting with third-party cloud storage for paid members, and manual export/import options are available for data transfer.

What features are available only to paid members?

While most features are free, some advanced functionalities are reserved for paid members. The website indicates that specific details on these paid features can be found in the pricing section, but does not list them explicitly in the provided content.

Is Siyuan fully open source?

Yes, Siyuan is completely open source. Its user interface, kernel, Android, iOS, and HarmonyOS apps, and Chrome clipping extension are all open source, and contributions are welcomed by the development team.

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