SparkleShare vs Unison
A side-by-side comparison of two self-hosted file sync & storage options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | SparkleShare | Unison |
|---|---|---|
| Deploy effort | Read-the-docs project | Read-the-docs project |
| Health score | 71 · Good | 88 · Excellent |
| Category | File Sync & Storage | File Sync & Storage |
| License | GPL-3.0 | GPL-3.0 |
| Language | C# | OCaml |
| Setup difficulty | Medium | Medium |
| Min. RAM | 128 MB | 64 MB |
| Deployment | bare-metal, binary | bare-metal, binary |
| GitHub stars | ★ 4,981 | ★ 5,493 |
| First released | 2010 | 1999 |
| Replaces | Dropbox | Dropbox |
What are SparkleShare and Unison?
SparkleShare
SparkleShare is a file synchronization tool that uses Git repositories as the storage backend, giving every change a full version history. It is well suited to syncing collaborative projects and small text-heavy files across machines.
- Git-backed versioning
- Automatic conflict handling
- End-to-end encryption option
- Self-hosted on any SSH host
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
SparkleShare vs Unison: key differences
SparkleShare is written in C#, while Unison is built with OCaml. Unison is the lighter option, starting around 64 MB of RAM against 128 MB for SparkleShare. Unison is the more established project (first released 1999), while SparkleShare arrived in 2010.
Why pick each one
Choose SparkleShare if…
- Full history of every change
- Works over plain SSH
Watch out for
- Poor with large binary files
- Slower development pace
Choose Unison if…
- Very reliable
- Fine-grained control
Watch out for
- Dated GTK interface
- Version matching between hosts
Frequently asked questions
Is SparkleShare or Unison 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 SparkleShare and Unison free and open-source?
Yes. SparkleShare is licensed under GPL-3.0 and Unison under GPL-3.0. Both can be self-hosted at no software cost.
Can I run SparkleShare and Unison with Docker?
SparkleShare: check the project docs for container support. Unison: check the project docs for container support.
Which is lighter on resources, SparkleShare or Unison?
Unison has the smaller minimum footprint at 64 MB of RAM, compared to about 128 MB for SparkleShare. Real-world usage depends on library size, user count, and enabled features.