Tonal Explorer is a hands-on music-theory toolkit for guitarists, pianists, producers, students, and teachers. Pick any key and mode and instantly see how the theory connects across an interactive fretboard, a piano keyboard, a chord matrix, and the circle of fifths — all in one fast, offline app. EXPLORE SCALES & MODES • All 12 keys with correct, readable note spelling for every mode • Major, melodic minor, harmonic minor, harmonic major, and double harmonic — 35 modes in all • Swipe to shift the tonal center; drag to transpose the whole scale like a capo • Brightness and tension controls to explore the color of each mode SEE THE HARMONY • A 7-row chord matrix from triads through 13ths, named correctly for every key • Roman-numeral analysis with chord quality • Per-chord extensions you can dial in degree by degree PLAY IT ON ANY INSTRUMENT • Interactive guitar fretboard with alternative tunings (Drop D, DADGAD, Open G, and more) • Piano keyboard with scale tones and chord tones highlighted • Chord voicing suggestions — open guitar shapes and keyboard inversions • Built-in synth plays notes, chords, and scales — all generated on device TUNE UP — NATIVE CHROMATIC TUNER • Real-time pitch detection using your device's microphone • Stable, accurate needle with cents display • Audio is processed entirely on your device and is never recorded or shared KEEP TIME • Metronome with tap tempo, time signatures, and a downbeat accent WORKS OFFLINE • Everything runs on your device — no account, no sign-up, no internet required, no ads, and no tracking of any kind. The free web version lives at tonalexplorer.com. The app brings the full experience to your home screen with native audio, the microphone tuner, and full offline use.