Learn to precisely tune pitches in randomly generated chords, scales and melodies, using equal temperament or just intonation! Key features in the Free version: - Four types of intervals, major and minor chords, and major scales to tune in equal temperament or just intonation - Training mode which tracks your average error - Detailed About page describing the just intonation system and listing the ratios used - Description of Pro features and a link to purchase the full version