head to head · open source
Outline vs Zotero
Outline has 41,145 GitHub stars, 3,650 forks, 78 open issues and last shipped yesterday. Zotero has 15,838 stars, 1,173 forks, 1,600 open issues and last shipped yesterday. Outline leads on adoption by 160% (41,145 vs 15,838 stars). Outline is written in TypeScript under a custom or non-standard licence; Zotero is written in JavaScript under a custom or non-standard licence. Outline has attracted 9% as many forks as stars, Zotero 7%. Zotero was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Outline | Zotero | |
|---|---|---|
| GitHub stars | ★ 41K | ★ 16K |
| License | Custom / other | Custom / other |
| Written in | TypeScript | JavaScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 3.6K | ⑂ 1.2K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Outline if
- You weight community size — 41K stars and counting
- You want the Custom / other license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick Zotero if
- You want the Zotero feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches JavaScript
- You evaluated both and Zotero fits your workflow better
About Outline
A fast, collaborative, knowledge base for your team built using React and Node.js. Try out Outline using our hosted version at www.getoutline.com . This is the source code that runs Outline and all the associated services. If you want to use Outline then you don't need to run this code, A hosted version of the app is offered at getoutline.com. You can also find documentation on using Outline in our guide. If you'd like to run your own copy of Outline or contribute to development then this is the place for you. Installation Please see the documentation for running your own copy of Outline in a production…
read the full Outline overview →
About Zotero
Zotero ====== Zotero is a free, easy to use tool to help you collect, organize, cite, and share your research sources. Please post feature requests or bug reports to the Zotero Forums. If you're having trouble with Zotero, see Getting Help. For more information on how to use this source code, see the Zotero documentation.
read the full Zotero overview →
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Frequently asked questions
Is Outline or Zotero more popular?
Outline has 41,145 GitHub stars and Zotero has 15,838. Outline has the larger community by that measure.
Are Outline and Zotero free?
Neither Outline nor Zotero declares a licence in this registry, so check each project's own repository before relying on either for a commercial use. Both are free to self-host.
What is the difference between Outline and Zotero?
Outline is written in TypeScript and Zotero in JavaScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Outline or Zotero?
Choose Outline if you want the larger community (41,145 stars) or its Custom / other licence terms. Choose Zotero if its feature set, stack or Custom / other licence fits better. Both are self-hostable.