Unison vs Zipline
A side-by-side comparison of two self-hosted file sync & storage options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Unison | Zipline |
|---|---|---|
| Deploy effort | Read-the-docs project | Under-an-hour setup |
| Health score | 88 · Excellent | 88 · Excellent |
| Category | File Sync & Storage | File Sync & Storage |
| License | GPL-3.0 | MIT |
| Language | OCaml | TypeScript |
| Setup difficulty | Medium | Medium |
| Min. RAM | 64 MB | 256 MB |
| Deployment | bare-metal, binary | docker |
| GitHub stars | ★ 5,493 | ★ 3,429 |
| First released | 1999 | 2021 |
| Replaces | Dropbox | Imgur, Dropbox |
What are Unison and Zipline?
Unison
Unison is a mature bidirectional file synchronization tool that reconciles changes made independently on two replicas. It detects conflicts, preserves both versions, and works over SSH for secure remote syncing.
- True bidirectional sync
- Conflict detection
- Works over SSH
- Cross-platform replicas
Zipline
Zipline is a fast self-hosted file upload server with a modern dashboard. It supports ShareX, image embeds, URL shortening, and detailed statistics.
- ShareX integration
- URL shortener built in
- Detailed upload statistics
Unison vs Zipline: key differences
Unison is written in OCaml, while Zipline is built with TypeScript. Licensing differs — GPL-3.0 for Unison versus MIT for Zipline. Unison is the lighter option, starting around 64 MB of RAM against 256 MB for Zipline. Unison is the more established project (first released 1999), while Zipline arrived in 2021. Zipline lists first-class Docker deployment; Unison does not.
Why pick each one
Choose Unison if…
- Very reliable
- Fine-grained control
Watch out for
- Dated GTK interface
- Version matching between hosts
Choose Zipline if…
- Released under the MIT license
- First-class Docker support for quick deployment
- Active community (3.4k GitHub stars)
- Written in TypeScript
Frequently asked questions
Is Unison or Zipline better?
Neither is universally better. Unison has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are Unison and Zipline free and open-source?
Yes. Unison is licensed under GPL-3.0 and Zipline under MIT. Both can be self-hosted at no software cost.
Can I run Unison and Zipline with Docker?
Unison: check the project docs for container support. Zipline: yes.
Which is lighter on resources, Unison or Zipline?
Unison has the smaller minimum footprint at 64 MB of RAM, compared to about 256 MB for Zipline. Real-world usage depends on library size, user count, and enabled features.