What may seem like a simple copy&paste scale trainer app is actually a nifty learning tool:
By (optionally) playing selected scales from a random base tone, you mimic the use of the scales in improvisation.

Currently supported scales:

MAJOR SCALES
• Major
• Major pentatonic
• Altered scale
• Bepop dominant
• Harmonic major

MINOR SCALES
• Natural minor
• Harmonic minor
• Melodic minor
• Minor pentatonic

SCALE MODES
• Ionian
• Dorian
• Phrygian
• Lydian
• Mixolydian
• Aeolian
• Locrian

OTHER SCALES
• Blues scale
• Wholetone
• Half-whole diminished
• Whole-half diminished
• Chromatic