Key Signature Quiz Free App for iOS
'Do you wish you could look at any piece of sheet music and instantly recognize which key signature it is written in? This simple app quizzes you on both major and minor keys, from 0 to 7 sharps or 0 to 7 flats, so you can learn to visually recognize all the standard key signatures in written music.
For the fraction of the cost of a music lesson, you can memorize the key signatures wherever you are, in just minutes a day.
Customization features allow you to choose:
1) Major keys, Minor keys, or both.
2) Just sharps, just flats, or both.
3) No time limit, 5 seconds per question, or 10 seconds per question.
Your results are stored in statistics, which you can view in a bar graph to chart your progress.'
This is a free app