Outline vs Zettlr
A side-by-side comparison of two self-hosted notes & knowledge base options — licensing, setup difficulty, resource needs, and what each one replaces.
Outline
Team knowledge base and wiki
VS
Zettlr
Markdown editor for writers, researchers, and Zettelkasten users
| Feature | Outline | Zettlr |
|---|---|---|
| Deploy effort | Under-an-hour setup | Read-the-docs project |
| Health score | 99 · Excellent | 94 · Excellent |
| Category | Notes & Knowledge Base | Notes & Knowledge Base |
| License | BSL-1.1 | GPL-3.0 |
| Language | TypeScript | TypeScript |
| Setup difficulty | Medium | Easy |
| Min. RAM | 1,024 MB | 256 MB |
| Deployment | docker | bare-metal, binary |
| GitHub stars | ★ 40,682 | ★ 13,577 |
| First released | 2017 | 2017 |
| Replaces | Notion, Confluence | Notion, Obsidian |
What are Outline and Zettlr?
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
Zettlr
Zettlr is a desktop Markdown editor designed for academic writing and Zettelkasten note management, with citation support and internal linking. While desktop-first, it works on plain Markdown folders that can sync between machines.
- Zettelkasten linking
- Citation manager support
- Multi-format export
- Folder-based projects
Outline vs Zettlr: key differences
Both projects are written in TypeScript. Licensing differs — BSL-1.1 for Outline versus GPL-3.0 for Zettlr. Zettlr is the lighter option, starting around 256 MB of RAM against 1,024 MB for Outline. Outline has the considerably larger community, at 40,682 GitHub stars versus 13,577. Outline lists first-class Docker deployment; Zettlr does not.
Why pick each one
Choose Outline if…
- Polished team wiki
- Great search
- Strong integrations
Watch out for
- Requires Postgres and Redis
- BSL is not fully open source
Choose Zettlr if…
- Strong academic features
- Plain Markdown files
Watch out for
- Desktop only
- No native sync server
Frequently asked questions
Is Outline or Zettlr better?
Neither is universally better. Outline has the larger community, while Zettlr is simpler to set up (easy difficulty). Choose based on the comparison table above and your own setup.
Are Outline and Zettlr free and open-source?
Yes. Outline is licensed under BSL-1.1 and Zettlr under GPL-3.0. Both can be self-hosted at no software cost.
Can I run Outline and Zettlr with Docker?
Outline: yes. Zettlr: check the project docs for container support.
Which is lighter on resources, Outline or Zettlr?
Zettlr 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.