Obsidian vs Outline
A side-by-side comparison of two self-hosted notes & knowledge base options — licensing, setup difficulty, resource needs, and what each one replaces.
Obsidian
Local-first knowledge base on a folder of Markdown files
VS
Outline
Team knowledge base and wiki
| Feature | Obsidian | Outline |
|---|---|---|
| Deploy effort | Read-the-docs project | Under-an-hour setup |
| Health score | 96 · Excellent | 99 · Excellent |
| Category | Notes & Knowledge Base | Notes & Knowledge Base |
| License | Proprietary | BSL-1.1 |
| Language | JavaScript | TypeScript |
| Setup difficulty | Easy | Medium |
| Min. RAM | 256 MB | 1,024 MB |
| Deployment | binary | docker |
| GitHub stars | ★ 21,797 | ★ 40,682 |
| First released | 2020 | 2017 |
| Replaces | Evernote, Notion, OneNote | Notion, Confluence |
What are Obsidian and Outline?
Obsidian
Obsidian is a powerful personal knowledge base that works on a local folder of plain Markdown files. While the app is proprietary, your notes remain fully local and portable, and self-hosted sync is possible via plugins.
- Plain Markdown file storage
- Bidirectional links and graph view
- Large community plugin ecosystem
- Local-first and private
Outline
Outline is a fast, collaborative knowledge base and wiki for teams with real-time editing and powerful search. It targets organizations that want a self-hosted documentation hub. It is deployed via Docker with PostgreSQL and Redis.
- Real-time collaborative editing
- Fast full-text search
- SSO and team permissions
- Slack and API integrations
Obsidian vs Outline: key differences
Obsidian is written in JavaScript, while Outline is built with TypeScript. Licensing differs — Proprietary for Obsidian versus BSL-1.1 for Outline. Obsidian is the lighter option, starting around 256 MB of RAM against 1,024 MB for Outline. Outline is the more established project (first released 2017), while Obsidian arrived in 2020. Outline lists first-class Docker deployment; Obsidian does not.
Why pick each one
Choose Obsidian if…
- Notes stay portable and local
- Highly extensible
Watch out for
- Core app is closed source
- Official sync is a paid service
Choose Outline if…
- Polished team wiki
- Great search
- Strong integrations
Watch out for
- Requires Postgres and Redis
- BSL is not fully open source
Frequently asked questions
Is Obsidian or Outline better?
Neither is universally better. Outline has the larger community, while Obsidian is simpler to set up (easy difficulty). Choose based on the comparison table above and your own setup.
Are Obsidian and Outline free and open-source?
Yes. Obsidian is licensed under Proprietary and Outline under BSL-1.1. Both can be self-hosted at no software cost.
Can I run Obsidian and Outline with Docker?
Obsidian: check the project docs for container support. Outline: yes.
Which is lighter on resources, Obsidian or Outline?
Obsidian has the smaller minimum footprint at 256 MB of RAM, compared to about 1,024 MB for Outline. Real-world usage depends on library size, user count, and enabled features.