Spacedrive 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 | Spacedrive | Unison |
|---|---|---|
| Deploy effort | Read-the-docs project | Read-the-docs project |
| Health score | 83 · Excellent | 88 · Excellent |
| Category | File Sync & Storage | File Sync & Storage |
| License | AGPL-3.0 | GPL-3.0 |
| Language | Rust | OCaml |
| Setup difficulty | Medium | Medium |
| Min. RAM | 512 MB | 64 MB |
| Deployment | binary | bare-metal, binary |
| GitHub stars | ★ 39,022 | ★ 5,493 |
| First released | 2022 | 1999 |
| Replaces | Google Drive, Dropbox | Dropbox |
What are Spacedrive and Unison?
Spacedrive
Spacedrive is an open-source, cross-platform file manager written in Rust, built around a virtual distributed filesystem (VDFS). It indexes and organizes files across multiple devices and storage locations from a single native app.
- Virtual distributed filesystem
- Indexes files across devices
- Cross-platform native app
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
Spacedrive vs Unison: key differences
Spacedrive is written in Rust, while Unison is built with OCaml. Licensing differs — AGPL-3.0 for Spacedrive versus GPL-3.0 for Unison. Unison is the lighter option, starting around 64 MB of RAM against 512 MB for Spacedrive. Unison is the more established project (first released 1999), while Spacedrive arrived in 2022. Spacedrive has the considerably larger community, at 39,022 GitHub stars versus 5,493.
Why pick each one
Choose Spacedrive if…
- Unified multi-device view
- Modern Rust core
- Cross-platform clients
Watch out for
- Still beta quality
- Sync features incomplete
Choose Unison if…
- Very reliable
- Fine-grained control
Watch out for
- Dated GTK interface
- Version matching between hosts
Frequently asked questions
Is Spacedrive or Unison better?
Neither is universally better. Spacedrive has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are Spacedrive and Unison free and open-source?
Yes. Spacedrive is licensed under AGPL-3.0 and Unison under GPL-3.0. Both can be self-hosted at no software cost.
Can I run Spacedrive and Unison with Docker?
Spacedrive: check the project docs for container support. Unison: check the project docs for container support.
Which is lighter on resources, Spacedrive or Unison?
Unison has the smaller minimum footprint at 64 MB of RAM, compared to about 512 MB for Spacedrive. Real-world usage depends on library size, user count, and enabled features.