All of these apps are available for Android devices. I haven’t been compensated for my reviews, I just want to share what apps are out there. See more categories under menu Android App Reviews.
(pro version available with more than 2 octave scales and arpeggios, I will probably purchase it eventually)
This app shows and can play for you different scales. This would be helpful for my violin students to have something help them stay in tune. Piano students could use it to help them see the key signatures and the notes on the staff. In the free version you can choose 1 or 2 octaves, and major, melodic minor, harmonic minor, or minor pentatonic. You can change the sound of the instrument it imitates, whether to count in, loop playback, clefs shown, key signatures or accidentals used, and instrument transposition. Also you can make playlists so you could have it set up to help multiple students.
Practicing scales just got fun. With this app you can record yourself playing scales and it will tell you how well you played it. First create a user, pick your instrument (piano not available), and choose a syllabus (create what you want to practice). Then you can choose your own scale, or have it “challenge me” by choosing for you. There are options to hear the scale, or you can just start recording. After you finish recording you can have it asses your playing. In the analysis it will show you exactly what you played by showing where you were sharp or flat, the notes on the staff, and your tempo. You can keep track of scores over all time, and save recorded files for listening to later. I used the free version which only offers F, C, and G scales/arpeggios, but the paid version would definitely be worth it.
A very visually appealing app! Read the help for a tutorial on how to use it (you swipe sideways to get the menu). You can choose any Scale, Chord, or Interval and it will show it to you on a keyboard, with an option to hear it as well. When I say any scale, chord, or interval, I mean any not just the most common ones (ex. Egyptian scale). It’s fun just to go through and listen to all of the different options.