I tried the iOS version. There were not any particular bugs for me. I just thought the user interface could be more aesthetically pleasing also with some new features too. Plus I don’t use a smart watch, nor do I enjoy carrying my phone around in my pocket to track my progress when I exercise.
I’m used to using the “Heria Pro” app for my fitness activities.
Check out Heria Pro and you will immediately see what features and design I am comparing actifit to.