Available worldwide
What is Unison?
Unison is an open-source utility that maintains two replicas of files and directories across separate hosts or storage devices, automatically propagating non-conflicting changes while detecting conflicting updates. It works over internet connections including slow links, and allows offline access to already-synchronized data.
Unison pricing
We don't have Unison's full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.
What Unison does
The capabilities that matter for file sync, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- Deployment model
- Self hosted
- Peer to peer p2p network routing
- ✓
- Client server architecture cloud host
- ✗
- Block level delta sync transfer speed
- ✓
- Self hosted linux docker deployment
- ✓
- Synology qnap nas hardware integration
- -
- Aws s3 azure blob external mounts
- -
- Active directory ldap identity sync
- -
- Version history and conflict resolution
- ✓
- End to end encryption keys in transit
- -
- SOC2 type ii
- -
- ISO 27001
- -
- Pricing model
- Free open source
Platform & deployment
Independently observed- CLI
- macOS
- Linux
- Windows
- Self-hosted
Unison alternatives
Other file sync we track, ranked by the same independent score.
- Rclonelow · 40%
- Syncthinglow · 31%
- SeafileA collaborative workspace for storing, organizing, and working on files with advanced metadata management and intelligent automationlow · 26%
- rsynclow · 16%
- Pydio Cellslow · 18%
- Resilio SyncA distributed platform for high-speed file access and collaboration across hybrid storage environmentslow · 30%
Compare Unison
Side by side against other file sync, attribute by attribute, with a source on every value.
The Vioscale score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Unison, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Pricing transparency | 80 | 0.08 | 6.7 | ✓ |
| Capabilities | 67 | 0.08 | 5.6 | ✓ |
| Price level | 100 | 0.05 | 5.2 | ✓ |
| Security score | 45 | 0.04 | 1.9 | ✓ |
| Stars | 71 | 0.03 | 1.8 | ✓ |
| Development activity | 19 | 0.09 | 1.8 | ✓ |
| Release cadence | 27 | 0.05 | 1.4 | ✓ |
| Reliability | 0 | 0.07 | 0.0 | - |
| Integrations | 0 | 0.09 | 0.0 | - |
| Dependent projects | 0 | 0.06 | 0.0 | - |
| Security posture | 0 | 0.07 | 0.0 | - |
| Package downloads | 0 | 0.14 | 0.0 | - |
| Developer Q&A activity | 0 | 0.06 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 3 | mediumsource · 2026-08-26 · 65% |
Adoption
| Attribute | Value | Evidence |
|---|---|---|
| Github stars | 5,455 | highsource · 2026-08-26 · 90% |
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Pricing model: free_open_source · Deployment model: self_hosted · Peer to peer p2p network routing: Yes · Self hosted linux docker deployment: Yes · Block level delta sync transfer speed: Yes · Client server architecture cloud host: No | mediumsource · 2026-08-21 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | OCaml | highsource · 2026-08-26 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | GPL-3.0 | highsource · 2026-08-26 · 95% |
Market
| Attribute | Value | Evidence |
|---|---|---|
| Availability | PrimaryMarkets: … · AvailabilityScope: global · AvailableCountries: … · NotAvailableCountries: … | highsource · 2026-08-21 · 75% |
Pricing
Release
Security
| Attribute | Value | Evidence |
|---|---|---|
| Scorecard | 4.5 | highsource · 2026-08-26 · 90% |