Metronaut alternatives

I tried to sign up for a month only and guess what its only offering 3 months min. At £53 for an app that i may never used in a couple of weeks its a rip off. Its all down hill from here, what the above tells me is that the app and the people behind it are only after the money and do not care about keeping people. So i assume they are desperate to keep the cash and get it. Avoid is massively expensive. Do not give the ruse it cheaper than a paid lesson. At least i know what i will be getting in the lesson. Like i said its shocking and a disgrace. Plus there are only two platforms, no pc, i hate using my phone at the best of times, not for learning a musical instrument. Avoid.