It is very nicely designed – Tone - Learn Perfect Pitch! Review

Hope this review helps! —— I really really like it. But: I’ve seen a few subscription software that has to do with audio popping up on the AppStore. My over all opinion is that it needs to go away. Just like the other apps I’ve seen that add more virtual circuits to my MP3 player, that want to charge 8 dollars a week, I will pass on stacking 100 dollars a year, despite the convenience it allows. I would however pay a premium price for a good software tool only once!
Review by poshsoup on Tone - Learn Perfect Pitch!.