Chordio
Chordio is a music theory and composition app for Mac that helps musicians explore chords, scales, modes, and chord progressions.
What is Chordio?
Chordio is a Mac music app for learning music theory and building chord progressions. It helps musicians, composers, producers, teachers, and students explore chords, scales, modes, and voicings in an interactive way while keeping ideas organized in one place. The app includes tools for finding related chords and scales, experimenting with progressions, and practicing with built-in sounds. On Mac, it is designed to fit into desktop music workflows and can be used alongside composition or teaching sessions. Chordio is published by Oneinabillion and is aimed at people who want a focused companion for songwriting, harmony study, and theory-based practice.
Key features
- Explore chords, scales, and modes interactively
- Build and save chord progressions for later use
- Find chord voicings that work well together
- View related chords and scales from a selected harmony
- Practice and experiment with built-in sounds
- Use MIDI input with a compatible keyboard
- Support different music notation systems
- Keep theory tools open during composition on Mac
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Safety overview
Status: Mostly safe
Chordio is a legitimate music app for Apple platforms, and its music-theory features are consistent with the kind of audio and MIDI access a composition tool may request. Use normal caution with microphone, MIDI, file, or media-library permissions and grant only what you need for your workflow. The bundle ID com.oneinabillion.chordmaster does not closely match the public product name Chordio, so if you are checking an installed copy, confirm that the app is signed by One In A Billion Ltd before keeping broad permissions enabled.
Recommendation: Keep Chordio if you use it for songwriting, harmony study, or music teaching on your Mac. If you no longer use it, removing the app should mainly affect your saved app-specific settings and stored progressions rather than core macOS functions. If anything about the installed copy looks unfamiliar, check the developer signature and permissions first, then decide whether to keep it installed.
Common paths
/Applications/Chordio.app
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