siyuan
SiYuan is a privacy-first, self-hosted personal knowledge management system for creating and managing knowledge using block-level references and a Markdown/WYSIWYG editor. It supports exporting content and includes features such as search, OCR, spaced repetition, and AI writing/Q&A via external APIs (e.g., OpenAI).
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Provided content mentions an access authorization code for server access and an option to bypass it via an environment variable. Details about TLS enforcement, per-endpoint API auth, rate limits, and secret handling/logging are not shown in the excerpt.
⚡ Reliability
Best When
You want a self-hosted, local-first style knowledge base with rich block linking and the option to integrate OCR and (optionally) external AI services.
Avoid When
You cannot or do not want to manage server/container deployment, storage, and backups for a self-hosted system.
Use Cases
- • Self-hosted personal knowledge management with block-level links and references
- • Markdown/WYSIWYG note-taking and large-document editing
- • Web clipping, PDF annotation/links, and OCR for documents
- • Spaced repetition flashcards
- • Embedding SQL queries and rich content blocks
- • Exporting notes to Markdown/HTML/PDF/Word and sharing to other platforms
Not For
- • A managed SaaS service with turnkey hosting (it is primarily self-hosted)
- • A mobile-first workflow where all core operations are fully supported without a desktop/server backend
- • Use as a general-purpose multi-tenant API platform without appropriate deployment isolation
Interface
Authentication
The README excerpt documents an 'access authorization code' for access to the server. It also describes an explicit bypass flag (SIYUAN_ACCESS_AUTH_CODE_BYPASS=true). The presence/absence of more granular API authentication details (e.g., per-endpoint tokens/scopes) is not shown in the provided content.
Pricing
Some AI features and/or advanced functions may depend on paid membership and external API usage (not fully specified in the excerpt).
Agent Metadata
Known Gotchas
- ⚠ No MCP server is documented in the provided content; agent integration likely requires calling the documented API directly.
- ⚠ The access authorization code may be bypassable via a specific environment flag; automation should avoid enabling bypass and should treat the code as a secret.
- ⚠ Self-hosted deployment means agents should account for environment-specific configuration (workspace path, ports, container user permissions).
Alternatives
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Scores are editorial opinions as of 2026-03-29.