Unison
Unison is a file-synchronization tool for OSX, Unix, and Windows.
- File Sync & Storage
- OCaml
- GPL-3.0
- Actively maintained
GitHub stats
- GitHub stars
- 5,513
- Forks
- 276
- Open issues
- 92
- Commits, last 12 months
- 98
- Last commit
- Sep 20, 2026
- Latest release
- v2.54.0May 1, 2026
- Created
- Feb 24, 2016
Data from the GitHub API, refreshed daily.
About Unison
Unison is a file-synchronization tool for OSX, Unix, and Windows. Unison is open source under the GPL-3.0 license and written mainly in OCaml, so you can read the code, run it on your own hardware and keep full control of your data.
The project has 5,513 stars and 276 forks on GitHub, with 98 commits over the last year. It installs natively rather than through an official Docker image, so plan for a short manual setup.
Repository preview
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What is Unison?
Unison is a free, open-source app you can host on your own server, listed in our File Sync & Storage category. Unison is a file-synchronization tool for OSX, Unix, and Windows. The source code lives at github.com/bcpierce00/unison, where it has 5,513 stars.
Is Unison free and open source?
Yes. Unison is open-source software released under the GPL-3.0 license, so you can self-host it at no cost. You only pay for the server it runs on, and some projects also offer an optional paid cloud plan.
Can I run Unison with Docker?
Unison does not list an official Docker image. It installs natively (deb and OCaml), so follow the install steps in its README or look for a community-maintained container.
What are the best alternatives to Unison?
Popular open-source alternatives to Unison include Syncthing, Puter and Nextcloud.
Is Unison actively maintained?
The most recent commit to Unison was on Sep 20, 2026 with 98 commits in the past twelve months. The latest release is v2.54.0, published May 1, 2026. Check the open issues on GitHub to gauge how quickly maintainers respond.