For uninstalling the app on the mac use app cleaner.
Note that the app saves the transcriptions as well as the audio and video previews media on your file system and not inside the app. This means that if you uninstall using app cleaner you will lose those files.
autoEdit.io it's free and open source. Free as in free speech as well as in free beer. Help support the autoEdit project to keep it that way. Support will go towards fixing bugs, adding features, provide support for users etc...