Need more than 1 octave displayed.
Response from developer
Dear Videlia1, in both free and pro versions you can select multiple octaves. However this needs to done before you enter the Test mode (ie clicking the Start button). With Pro version, it tracks your accuracy against the selected octaves, and displays them in corresponding colours, above the octave number. You also get a Guest mode that doesn’t tamper with your statistics. This information is available on the app via the Info button (to the left of C# key) in the non-test mode. Also on our website (link on the App Store page of the app).