When comparing Ungit vs GitUI, the Slant community recommends Ungit for most people. In the question“What are the best Git clients for Windows?” Ungit is ranked 21st while GitUI is ranked 25th. The most important reason people chose Ungit is:
Ungit is open source software available under the MIT Licence.
Specs
Ranked in these QuestionsQuestion Ranking
Pros

Pro Free and Open Source Software
Ungit is open source software available under the MIT Licence.

Pro Cross-platform
Works on Windows, Linux, and OS X.
Pro Optional Integration with Modern Text Editors
Ungit can be integrated directly into modern text editors, Atom, Brackets, and VS Code.
Pro Web-based interface
Ungit is web-based, meaning you can run it on your cloud/pure shell machine and then use the UI from your browser.
Pro Context based help
No need to memorize a ton of keys or crawl man pages, gitui only Shows you the valid keys depending on your current context.
Pro Intuitive key shortcuts
Perfect for developers who hate to leave their keyboard.
Pro Very fast even in massive repos
Most alternatives crash or run out of memory when opening 1M+ commits repos line Linux.
Pro Free and open source
Pro Crossplatform
Supports macOS, Linux, and Windows.
Cons
Con Node.js dependent

Con Setup is not user-friendly
Ungit is distributed as an NPM package and requires git and Node.js to be installed on your system before you can run it. Ungit must be launched by running ungit
in a command line terminal.
Con Exposes git commands to your network
No authentication, if someone can communicate with your computer on the port this is running on, they can execute any git command they want on your repos as well as view your filesystem's folders.
Con Terminal is not for everyone
It fills a niche between full-blown GUI apps and the bare git CLI.
Con Lacks some features
It’s still in active development and catches up quickly.
