Unison vs elFinder
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 | elFinder |
|---|---|---|
| Deploy effort | Read-the-docs project | Read-the-docs project |
| Health score | 88 · Excellent | 87 · Excellent |
| Category | File Sync & Storage | File Sync & Storage |
| License | GPL-3.0 | BSD-3-Clause |
| Language | OCaml | JavaScript |
| Setup difficulty | Medium | Medium |
| Min. RAM | 64 MB | 128 MB |
| Deployment | bare-metal, binary | bare-metal |
| GitHub stars | ★ 5,493 | ★ 4,804 |
| First released | 1999 | 2010 |
| Replaces | Dropbox | Google Drive, Dropbox |
What are Unison and elFinder?
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
elFinder
elFinder is an open-source web file manager with a user interface inspired by the macOS Finder. It supports multiple storage backends, drag and drop, and image editing.
- macOS Finder-style UI
- Multiple storage backends
- Built-in image editor
Unison vs elFinder: key differences
Unison is written in OCaml, while elFinder is built with JavaScript. Licensing differs — GPL-3.0 for Unison versus BSD-3-Clause for elFinder. Unison is the lighter option, starting around 64 MB of RAM against 128 MB for elFinder. Unison is the more established project (first released 1999), while elFinder arrived in 2010.
Why pick each one
Choose Unison if…
- Very reliable
- Fine-grained control
Watch out for
- Dated GTK interface
- Version matching between hosts
Choose elFinder if…
- Released under the BSD-3-Clause license
- Active community (4.8k GitHub stars)
- Written in JavaScript
- Tiny footprint — runs in 128 MB RAM
Frequently asked questions
Is Unison or elFinder 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 elFinder free and open-source?
Yes. Unison is licensed under GPL-3.0 and elFinder under BSD-3-Clause. Both can be self-hosted at no software cost.
Can I run Unison and elFinder with Docker?
Unison: check the project docs for container support. elFinder: check the project docs for container support.
Which is lighter on resources, Unison or elFinder?
Unison has the smaller minimum footprint at 64 MB of RAM, compared to about 128 MB for elFinder. Real-world usage depends on library size, user count, and enabled features.