Foam is a free, open-source note-taking application that uses a graph database to store notes as a network of interconnected ideas. It's designed to help users create a knowledge graph, where each note is a node that can be linked to other notes, creating a web of relationships between ideas.
Siyuan is a powerful note-taking and knowledge management tool that allows users to organize and connect their thoughts and ideas. It features a unique block-based structure and supports various media formats, making it an ideal tool for researchers, writers, and students.
- Highly customizable and extensible
- Strong focus on knowledge management
- Simple, distraction-free interface
- Free and open-source
- Powerful note-taking and knowledge management features
- Customizable and flexible layout
- Real-time collaboration and commenting
- Supports various media formats
- Steep learning curve
- Limited mobile support
- Not suitable for large-scale collaboration
- Steep learning curve due to unique block-based structure
- Limited mobile app functionality
- No built-in task management features
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The Verdict
AI-generated from listing dataBoth Siyuan and Foam are free, open‑source note‑taking tools with steep learning curves, but Siyuan offers built‑in real‑time collaboration while Foam provides a richer plugin ecosystem and API.
Key differences
- •Siyuan includes real‑time collaboration and commenting; Foam does not support large‑scale collaboration.
- •Foam offers an API and extensive plugin/theme extensibility; Siyuan has no API.
- •Siyuan exports to Markdown, PDF, and HTML; Foam focuses on Markdown only.
- •Mobile functionality is limited for both, but Siyuan’s limitation is noted as “Limited mobile app functionality.”
- •Foam stores notes in a graph database for queryability; Siyuan uses a block‑based structure without a graph DB.
Pricing & value
Both are free and open‑source, offering comparable cost‑free value.
Ease of use / learning curve
Both have steep learning curves due to unique structures (block‑based for Siyuan, graph‑based for Foam).
Features & depth
Siyuan provides real‑time collaboration, commenting, media embedding, and multi‑format export, which Foam lacks.
Integrations & ecosystem
Foam has an API, plugin architecture, and GitHub integration; Siyuan has no API.
Collaboration
Siyuan enables real‑time collaboration and commenting; Foam is not suitable for large‑scale collaboration.
Scalability
Foam’s graph database allows easier querying of large note networks; Siyuan’s block system is less query‑friendly.
Support
Both provide email and GitHub Issues support; no other support channels listed.
Choose Foam if…
Knowledge workers wanting extensible, API‑driven notes with strong plugin ecosystem.
Choose Siyuan if…
Researchers or students needing collaborative, media‑rich notes with export flexibility.
Common questions
Is there any cost to use either tool?
Both Siyuan and Foam are free and open‑source.
Can I collaborate with teammates in real time?
Only Siyuan offers built‑in real‑time collaboration and commenting.
Do either tools provide an API for custom integrations?
Foam provides an API; Siyuan does not.