Piano Atlas is a piano theory and practice companion for exploring scales, chords, arpeggios, chord progressions, borrowed chords, and the circle of fifths in every key.
- Mode Choose what you want to study: Scales, Chords, Arpeggios, or Circle. Each mode changes the library, notes, details, piano highlights, playback, and practice sections.
- Search Find any root, scale, chord, arpeggio, or circle key quickly from the sidebar.
- Root note Select the starting note for the current item. The app rebuilds the notes, formulas, piano highlights, chord names, and theory text around that root.
- Scale Library Browse major, minor, modal, pentatonic, blues, diminished, and chromatic scales. The Notes card shows the scale tones, fingerings, and degree numbers.
- Chords Study triads, suspended chords, sixth chords, seventh chords, diminished colors, and add9 chords. Use the inversion buttons to view root position, 1st inversion, and 2nd inversion.
- Arpeggios Hear chords broken into melodic patterns. Start with a one-octave arpeggio, then use the octave button to switch to the two-octave version.
- Circle of Fifths See major keys, relative minors, neighboring keys, accidentals, and key signatures. This mode helps explain key relationships, modulation, and dominant movement.
- Details Read the formula, notes, intervals, step pattern, notation, type, and left/right-hand fingering for the selected item.
- Theory info Click the small i button in Details for a deeper explanation of the current scale, chord, arpeggio, or circle-of-fifths selection.
- Piano The keyboard highlights the selected notes. Click highlighted keys to hear them, or use Play and Pattern to hear the full shape.
- Play Plays the selected item. In Chords mode it plays the chord together; in Scales and Arpeggios it plays the note sequence.
- Pattern Plays the notes as a moving pattern, useful for hearing the shape and practicing the motion across the piano.
- Keyboard labels Switch the piano between note names, scale degrees, and interval labels.
- Chords in this scale In Scales mode, this section shows the seven diatonic chords that belong naturally to the selected scale. Click a chord card to hear it.
- Modular Interchange: Borrowed chords Explore useful outside chords from parallel keys and related colors. These help add surprise, emotion, and stronger harmonic movement.
- Chord progressions Generate fitting progressions in the current scale. Choose a style such as Classical, Jazz, Pop, or Blues, then play or favorite the generated result.
- Learning tools Use Daily Practice, Practice Mode, Ear Training, Compare Mode, and Progression Builder to turn the reference material into active practice.
- Favorites Save scales, chords, arpeggios, and chord progressions so you can return to them quickly. Favorites are stored locally on your device.
- Dark mode and fullscreen Use the top-right controls to switch between light/dark themes or toggle fullscreen for a cleaner practice view.
A good way to practice is to pick a root note, study the notes and fingerings, listen with Play, try Pattern, then explore the matching chords and progressions.
Version 1.0.0