Obsidian vs Foam
Side-by-side comparison of features, pricing, ratings, and alternatives.
Obsidian is a note-taking and personal knowledge management app built around plain markdown files stored locally on your device. Rather than a rigid folder hierarchy, Obsidian encourages a networked structure through bidirectional links, backlinks, and an interactive graph view that visualizes how notes connect. Because notes are just markdown files on disk, Obsidian is fast, works fully offline, and keeps your data portable - there is no proprietary lock-in. A large community plugin ecosystem extends the core app with everything from spaced-repetition flashcards to kanban boards and calendar views. Obsidian Sync and Obsidian Publish are optional paid add-ons for cross-device syncing and publishing notes as a website, but the core app is free for personal use.
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.
Free for personal use; commercial licenses and sync/publish are paid add-ons.
- Full data ownership with local markdown files
- Extremely fast and works offline
- Massive plugin ecosystem
- One-time payment for sync (no forced subscription)
- Highly customizable and extensible
- Strong focus on knowledge management
- Simple, distraction-free interface
- Free and open-source
- Steeper learning curve than typical note apps
- Mobile app less polished than desktop
- Sync/Publish cost extra
- Steep learning curve
- Limited mobile support
- Not suitable for large-scale collaboration
What reviewers say
Obsidian Reviews
4.0 (2)Highly recommend Obsidian
Obsidian has quickly become part of our daily workflow. Extremely fast and works offline. One minor gripe: sync/publish cost extra, but it hasn't been a dealbreaker. Would recommend to anyone considering it.
Highly recommend Obsidian
Obsidian has quickly become part of our daily workflow. Extremely fast and works offline. One minor gripe: mobile app less polished than desktop, but it hasn't been a dealbreaker. Would recommend to anyone considering it.
Foam Reviews
No reviews yet.
More alternatives & similar tools
Alternatives to Obsidian
View all →
The Verdict
AI-generated from listing dataObsidian offers a richer plugin ecosystem and optional paid sync with local markdown ownership, while Foam provides a completely free, open‑source, highly customizable solution.
Key differences
- •Obsidian stores notes as local markdown files; Foam uses a graph database backend.
- •Obsidian has a paid sync/publish add‑on; Foam is entirely free and open‑source.
- •Obsidian’s plugin ecosystem exceeds 1000 community plugins; Foam’s plugins are fewer but built on a TypeScript API.
- •Mobile experience: Obsidian has iOS/Android apps (less polished); Foam has limited mobile support.
Pricing & value
Foam is completely free and open‑source; Obsidian requires paid add‑ons for sync/publish.
Ease of use / learning curve
Obsidian’s UI is more polished for desktop; both have steep learning curves, but Obsidian’s docs are broader.
Features & depth
Obsidian offers bidirectional links, graph view, Canvas, and 1000+ plugins; Foam provides core linking and graph but fewer built‑in tools.
Integrations & ecosystem
Obsidian integrates with Git, iCloud, Dropbox; Foam integrates mainly with GitHub and Markdown.
Collaboration
Obsidian offers paid sync/publish for team sharing; Foam is not suited for large‑scale collaboration.
Scalability
Obsidian’s local file system scales with storage; Foam’s graph database may hit limits for very large vaults.
Support
Obsidian provides community forum and Discord; Foam offers email and GitHub Issues, but fewer dedicated channels.
Security & privacy
Obsidian keeps data locally by default; Foam stores notes in a graph DB but still local files, no lock‑in.
Migration / lock‑in
Obsidian uses plain markdown files, ensuring easy export; Foam’s graph DB adds an extra migration step.
Choose Obsidian if…
Researchers or developers who need powerful plugins, visual graph tools, and optional paid sync.
Choose Foam if…
Users who prioritize zero cost, open‑source code, and deep customizability via TypeScript.
Common questions
Is there any cost to sync notes across devices?
Obsidian requires a paid sync add‑on; Foam has no built‑in sync and relies on manual Git or file sharing.
Can I export all my notes to a standard format?
Obsidian stores notes as plain markdown files, export is trivial; Foam stores notes in a graph DB, export requires conversion.
Which tool supports mobile use?
Obsidian offers iOS and Android apps (less polished); Foam’s mobile support is limited.