ReHarmo
繁體中文Reharmonization app
Same melody,
better chords
ReHarmo reharmonizes your song. The melody stays, the colors change. It doesn’t guess: every chord follows music theory, and one tap shows you why.
iPhone, iPad, Android
What it does
A new take every tap
Pick a style, set color and adventure, tap “New set”. Pop, R&B, Jazz, Gospel, J-Pop, Country, Dance and Rock each follow their own habits.
A reason for every chord
Secondary dominants, modal interchange, tritone subs, inversions, pedal bass. Tap any chord to see why it’s there and how it leads to the next.
Never fights the melody
The engine checks the melody bar by bar. Chords that clash with important notes never show up.
Numbers or letters, your way
Switch between staff and numbered notation, letter chords and scale-degree chords. Degrees stay the same in any key.
Start from just a melody
Play a MIDI keyboard, hum into the mic, or tap the on-screen keys. With only a melody, it adds a basic set of chords for you.
Shape the whole song
Calm verses, rich choruses, a bold bridge. Split your song into sections and set them all in one tap, then layer on a mood: sad, bright, dreamy.
Screens
Plans and pricing
Free
$0
- Reharmonize, listen, see why each chord works
- MIDI keyboard and hum-to-notes input
- Basic chords from your melody
- Up to 3 songs
- Two styles: Pop and Dance
- Backup file export and import
Pro
$5.99/month, $39.99/year, or $99 once
- Unlimited songs
- All 8 styles
- Moods and modes (Dorian, Mixolydian, Lydian, Phrygian)
- Per-section settings, one-tap song shaping
- Keep several versions to compare
- Export sheet image, PDF, MIDI
- Cloud sync
Prices in US dollars; see the store for your region. Monthly and yearly plans renew automatically and can be cancelled anytime.
FAQ
What is ReHarmo?
ReHarmo is a reharmonization app. Enter a song’s melody and its original chords, and it swaps in a new set of chords with a different color, without touching the melody, and explains the theory behind each one. It’s made for arrangers, accompanists, gigging musicians and anyone learning harmony.
Is ReHarmo free?
ReHarmo is free to download and use. The free plan reharmonizes, plays back and explains every chord, with up to 3 songs and two styles. Pro unlocks all 8 styles, moods, modes, export and cloud sync. In the US it costs $5.99 a month, $39.99 a year, or $99 once; prices in other regions are shown in the store.
Does ReHarmo use AI?
No. ReHarmo’s harmony engine is a fixed set of music-theory rules, not an AI model. It works offline, it can always tell you why it chose a chord, and it never sends your song anywhere to be processed.
Do I need to know music theory?
No. Pick a style, move a few sliders, and listen. Every chord comes with a plain-language note such as “it’s the dominant of the next chord, so it pulls your ear forward”, and you pick the theory up as you go.
Does it support numbered notation and number chords?
Yes. The melody can be shown as staff or numbered notation (jianpu), and chords as letters (C, Am7) or scale degrees (1, 6m7), which stay the same in any key.
Can I use a MIDI keyboard or sing the melody in?
Yes. ReHarmo takes melody and chords from a MIDI keyboard, and can turn humming or an instrument into notes through the microphone. Microphone audio is processed on your device only; it is not recorded or uploaded.
Is there an Android and iPad version?
Yes. ReHarmo runs on iPhone, iPad and Android, with a wide layout on iPad. Sign in with the same account and Pro bought on one device is recognized on the others.
Will I lose my songs if I change phones?
No. On the free plan you can export all songs as one backup file and import it on the new phone. With Pro, signing in syncs your songs to the cloud automatically.