Obsidian vs SiYuan
Obsidian
obsidian.md
SiYuan
b3log.orgSide by side
| Figure | Obsidian | SiYuan |
|---|---|---|
| Price from | $4.17/mo | $64/mo |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | — | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 6 | 5 |
| Spec score · Note-taking apps | 9.5 (#3) | 9.1 (#12) |
| Spec score · Personal Knowledge Management Software | 9.1 (#2) | 8.5 (#12) |
| Free plan | Yes | Yes |
| Integrations | Notion,Airtable,Microsoft OneNote,Evernote,Apple Notes,Apple Journal,Google Keep,Bear,Craft,Roam Research,Logseq,Tomboy,Gnote | Paid options include third-party S3 and WebDAV data sync and backup; users must provide their own storage, and Nutstore is not supported for WebDAV. |
| Note sharing | Yes | Yes |
| Offline access | Yes | Yes |
| Supported platforms | Windows,macOS,Linux,iOS,Android,Chrome extension | Windows,macOS,Linux,iOS,Android,web interface,Chrome/Edge extension,API,Docker self-hosting |
| Storage limit | 1 | 8 |
Plans
Obsidian
- Sync Standard$5 a month
- Sync Plus$10 a month
- Publish$10 a month
- Catalyst$25, paid once
- Commercial$50 a year
- FreeFree
SiYuan
- FreeFree
- PRO Features$64 a month
- Subscription$148 a month
- PRO Features$64, paid once
- Subscription$148, paid once
In their own words
Obsidian
Obsidian is a note-taking app for keeping notes and building a personal knowledge workspace. Its core app is free, has no sign-up requirement, and stores notes on the user's device so they remain available offline. It runs on Windows, macOS, Linux, iOS, Android, and as a Chrome extension. Canvas provides an open workspace for research, brainstorming, diagrams, and ideas; thousands of plugins and an open API allow workflow customization. Shared vaults support team work with real-time updates. Sync adds synchronization and version history: Standard costs $5 per user per month billed annually, with one vault, 1 GB of storage, a 5 MB maximum file size, and one month of history. Plus costs $10 per user per month billed annually, with 10 vaults, 10 GB, a 200 MB maximum file size, and 12 months of history. Publish is $10 per site per month billed annually and includes up to 4 GB hosting per site. It offers themes, custom domains, password protection, and SEO optimization.
SiYuan
SiYuan is a personal knowledge management system for building a linked collection of notes. It supports Markdown, block-level references and bidirectional links, and organizes content into blocks with more than 20 block-level and more than 10 span-level element types. Backlinks can be filtered and searched; relationship graphs are available across a notebook and at block level. Databases support relations, rollups and templates, while flashcards use the FSRS spaced-repetition algorithm. Its AI feature connects to OpenAI for writing continuation, translation, summaries, brainstorming and grammar or spelling corrections. SiYuan supports offline access, and the maker describes multi-device synchronization as incremental and end-to-end encrypted. It is available on Windows, macOS, Linux, iOS, Android and the web, with a Chrome/Edge extension, API and Docker self-hosting. The maker says data stays under the user's control on their device. Free access is free; PRO Features is listed at $64 a month with lifetime-use wording, and Subscription at $148 a month with 8GB cloud storage.