Their main one, but this one doesn't work if Orbot is running and Amethyst starts after it....
Orbot seems to use it in a similar way, so I don't know what might be causing the issue.
Discussion
Doesnt work you mean it doesn't start? I detected the same behavior with the other 2 Tor libraries I tested in Android.
I already discarded the idea of ports collision but never dig into the real reason. Happy to help or hear if you found the solution 😁