FreeChord
Chords, Scales & Piano
$0.99 · Designed for iPad. Not verified for macOS.
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
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, 以祁 孙, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 以祁 孙
- Size
- 3.3 MB
- Category
- Music
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Simplified Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2026 FreeChrod
