Harmony Pro vs OtoTheory
| Harmony Pro | OtoTheory | |
|---|---|---|
| Free plan | Yes | Yes |
| Free trial | No | Yes |
| Paid from | Free | Free |
| Open source | No | No |
| Platforms | macOS, Web, Windows | iOS, Web |
| Free plan | Yes | Yes |
| Reverse chord lookup | Yes | Yes |
| Progression generator | Yes | Yes |
| Voicing explorer | Yes | Yes |
| Chord audio playback | Yes | Yes |
| Paid from | — | 5.99 /mo |
| Supported instruments | — | guitar, bass, keyboard |
| Chord chart export | — | Yes |
| Mobile apps | — | ios |
Both are listed in Best Chord Finder Software. On Samsung Mobile US Press, OtoTheory scores higher on our published basis.