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 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.

https://github.com/guardianproject/tor-android 
 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 😁