head to head · open source
syncthing vs Ultracopier
syncthing has 89,672 GitHub stars, 5,535 forks, 388 open issues and last shipped yesterday. Ultracopier has 509 stars, 96 forks, 2 open issues and last shipped 14 days ago. syncthing leads on adoption by 17,517% (89,672 vs 509 stars). syncthing is written in Go under MPL-2.0; Ultracopier is written in C++ under GPL-3.0. syncthing has attracted 6% as many forks as stars, Ultracopier 19%. syncthing was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| syncthing | Ultracopier | |
|---|---|---|
| GitHub stars | ★ 90K | ★ 509 |
| License | MPL-2.0 | GPL-3.0 |
| Written in | Go | C++ |
| Last push | 2026-10-24 | 2026-10-11 |
| Forks | ⑂ 5.5K | ⑂ 96 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick syncthing if
- You weight community size — 90K stars and counting
- You want the MPL-2.0 license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick Ultracopier if
- You want the Ultracopier feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches C++
- You evaluated both and Ultracopier fits your workflow better
About syncthing
[![Syncthing][14]][15] Goals Syncthing is a continuous file synchronization program . It synchronizes files between two or more computers. We strive to fulfill the goals below. The goals are listed in order of importance, the most important ones first. This is the summary version of the goal list for more commentary, see the full [Goals document][13]. Syncthing should be: 1. Safe From Data Loss Protecting the user's data is paramount. We take every reasonable precaution to avoid corrupting the user's files. 2. Secure Against Attackers Again, protecting the user's data is paramount. Regardless of our other goals…
read the full syncthing overview →
About Ultracopier
About Ultracopier is free and open source software licensed under GPLv3 that acts as a replacement for files copy dialogs. Main features include: task queue pause / resume resume unfinished jobs dynamic speed limitation collision management plugin support Dependency make gcc C++17 complier (due to Qt6.7) For example on Debian based distros: Building Building an all in one version is as easy as compiling the main Qt project: Run Target minimal dependency (searcg dependency hell, bug/security problem in dependency) no bloatware (no stupid features, no features used for only 1 person if imply lot of code or…
read the full Ultracopier overview →
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Frequently asked questions
Is syncthing or Ultracopier more popular?
syncthing has 89,672 GitHub stars and Ultracopier has 509. syncthing has the larger community by that measure.
Are syncthing and Ultracopier free?
Both are open source. syncthing is licensed under MPL-2.0 and Ultracopier under GPL-3.0. Neither carries a licence fee.
What is the difference between syncthing and Ultracopier?
syncthing is written in Go and Ultracopier in C++. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, syncthing or Ultracopier?
Choose syncthing if you want the larger community (89,672 stars) or its MPL-2.0 licence terms. Choose Ultracopier if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.