The source code is hosted on Github: https://github.com/gitbutlerapp/gitbutler

I was really hoping we'd see some competition to Github, but no, this is competition for the likes of the Conductor App. Disappointed, I must say. I am tired of using and waiting for alternatives of, Github.

The diff view in particular makes me rage. CodeMirror has a demo where they render a million lines. Github starts dying when rendering a couple thousand. There are options like Codeberg but the experience is unfortunately even worse.