FreeChord

Explore chords, scales, inversions, the circle of fifths, a full-screen piano, tuner, and metronome in one focused music toolbox.

Harmonia Atlas is a focused music-theory and piano toolbox for iPhone and iPad.

CHORDS YOU CAN SEE AND HEAR • Browse a complete chord catalog by root, family, and inversion • See every matching note repeated across a scrollable, accurately proportioned keyboard • Tap the keyboard to hear the full voicing immediately • Inspect root position and physical inversions with synchronized bass, note names, colors, and playback

SCALES AND HARMONY • Explore more than 50 scales and modes • View degrees, adjacent intervals, formulas, repeated keyboard highlights, and diatonic triads or seventh chords • Play scales ascending, descending, or up and down across multiple octaves

INTERACTIVE CIRCLE OF FIFTHS • Drag the wheel naturally and tap the major or relative-minor ring independently • See dominant, subdominant, related keys, scale notes, and diatonic chords update together

FULL-SCREEN PIANO • Landscape performance view with multi-touch note control • Scroll the full A0–C8 range • Show one to seven visible octaves in one or two keyboard rows • Switch between acoustic piano, bright piano, electric piano, jazz organ, and soft synth sounds

PRACTICAL MUSIC TOOLS • Chord progression library and editor with playback, tempo, looping, and saved drafts • Real-time microphone tuner with cents display and adjustable A4 reference • Continuously moving mechanical metronome with 30–240 BPM, meter, accents, and tap tempo • Reverse chord and scale lookup from selected piano keys • Local favorites, recents, and saved progressions

Harmonia Atlas works without an account. Core theory data and preferences stay on the device. Tuner audio is analyzed locally and is not recorded or uploaded.

Privacy Policy: https://onlyis.github.io/danmubao/harmonia-atlas-web/privacy.html Terms of Use: https://onlyis.github.io/danmubao/harmonia-atlas-web/terms.html