PianoTeacher is priced at $1.99 in Google Play; it is normally priced at $1.99 at the Amazon Appstore. As we've noted before, there are sometimes differences in pricing and availability between the two marketplaces.
PianoTeacher is described as follows:
The full version.
learn how to play piano chords notes and scales.
The only piano app on the market that will teach you piano chords, scales & notes.
After using the app you will be able to read and play almost every song’s chords you’d like.
PIANOTEACHER WILL HELP YOUR EXPENSIVE PIANO LESSONS TO REALLY PAY OFF!!!
PianoTeacher has a 5.0-star rating in Google Play and a 2.4-star rating in the Amazon Appstore.
The Google Play rating comes with only four ratings, though. Much of the negativity involves Adobe Air, which is a big strike in the Amazon Appstore.
We'd buy this while it was free, at least to try it.
We continue to be disappointed with the FAOTD program. It began promisingly enough, with Angry Birds Rio, but we've gotten tired of the endless games or niche apps, and especially apps which have no uptake in Google Play, and seem to be FAOTD as a desperation move by the developer.
We'd like to see free versions of say, Office-compatible software or useful utilities such as CalenGoo instead of niche apps or endless games (we just assume every day that it's going to be a game; it's gotten that bad).
Amazon.com opened up the Appstore despite a lawsuit by Apple, which has previously trademarked the term "App Store." Microsoft has filed an appeal against that trademark, saying the term is too generic. Amazon.com has responded to the lawsuit in the same manner.
Apple has already lost a portion of that lawsuit, which said Amazon.com had participated in "false advertising."