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Software · Backup & sync

Unison

Unison is a file synchronisation program, available on Windows and Linux.

  • Completely free
  • Windows and Linux
  • Open source
  • No account

Overview

Unison is a file synchronisation program, available on Windows and Linux.

Services and protocols mentioned: SSH.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “File synchronization Tool” — Winget, 10 November 2026

At a glance

All of Unison is free: no feature is locked behind a paid plan, and its code is open.

Its licence (GPL-3.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

  • Open source code
  • No account needed
  • Commercial use allowed

About

Unison is a file-synchronization tool for POSIX-compliant systems (e.g. *BSD, GNU/Linux, macOS) and Windows. It allows two replicas of a collection of files and directories to be stored on different hosts (or different disks on the same host), modified separately, and then brought up to date by propagating the changes in each replica to the other. Note: if you want to connect to this Flatpak build remotely via SSH, put this in the profile file: servercmd = flatpak run --command=unison io.github.bcpierce00.unison

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Facts collected from LicitPro automatic classification () —
  • Facts collected from Winget (Windows Package Manager) (credit card, account, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Last technical check: 6 November 2026
  • Description from Flathub — AppStream (Flathub)

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