For diplacusis
When music sounds out of tune between your ears
Harmonic Recovery is a music player and pitch-practice app for people whose ears hear the same note at different pitches. Practice with your own songs, measure the mismatch in cents, and see whether it's changing.
On a computer? Scan with your phone's camera to open the app in its store.
Not sure it's you? Try the free 3-minute pitch check →
Does this sound familiar?
Your ears agree on the song, but not on the pitch
Music sounds wrong
Songs you know by heart sound sour, doubled or detuned, while speech sounds mostly fine.
One ear is sharp or flat
A note sounds higher in one ear than the other. Cover an ear and the music changes.
It started with a hearing change
Often after sudden hearing loss, with Ménière's disease, or hearing loss in one ear.
It's called diplacusis. Learn what it is and what causes it →
See it in 22 seconds
One note, two pitches
The app plays your music clearly in your affected ear while the same music fades in and out in your other ear, as a pitch hint. It measures your mismatch, drills your ear, and tracks your practice.
How it works
Measure. Listen. See what changes.
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Measure the mismatch
A pitch-matching check shows how far apart your ears hear a note, in cents, at six frequencies. About 6 minutes, after a one-time headphone setup.
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Listen with a pitch hint
Your own songs play clearly in your affected ear while the same music fades in and out in your other ear, a reference for the right pitch.
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See whether it changes
Repeat the check every week or two. A chart shows your mismatch over time, and only calls it a change when it beats your normal variation.
Built for real life
Practice that fits into your day
- Your own music. Add MP3s, or on iPhone, songs from your library.
- Six training levels, from a strong hint to brief glimpses, with suggestions based on your own checks.
- 3-minute pitch drills: higher or lower? The difficulty adapts to your answers.
- A daily goal and streaks, a 12-week calendar and a daily "How does music sound today?" check-in.
- Listening mode for simply enjoying music with your own left/right balance.
- Your results stay on your phone. No account and no ads.
Honest about the evidence
Plausible, not yet proven
Adult pitch hearing can recalibrate against a trusted reference, and pitch hearing improves with practice. But no study has tested this method for diplacusis yet. That's why the app measures instead of assuming: you'll see whether your mismatch changes.
Why it exists
Made by someone who hears it too
I have diplacusis. I built Harmonic Recovery so I could practice with music and measure whether anything changes, and so others with it could too.
Free to start
Measurement and safety stay free for everyone. Premium is $3.99 a month in the US (prices vary by country), and eligible new subscribers can try it free for 7 days. Nothing is ever deleted if you stop paying: you keep every result.
| Feature | Free | Premium |
|---|---|---|
| Training with the pitch hint | 15 minutes a day | Unlimited, with background play |
| Listening mode (plain music) | Unlimited, app open | Unlimited, with background play |
| Full hearing check | Every 14 days | Any time |
| 1-minute quick check | — | ✓ |
| Pitch drills | 1 a day | Unlimited |
| Latest result and first-vs-latest comparison | ✓ | ✓ |
| Full history and trend charts | Listed; details locked | ✓ |
| Training levels and suggestions | ✓ | ✓ plus custom hint settings |
| Headphone setup, streaks, calendar, daily check-in | ✓ | ✓ |
Start practicing with your own music
Free to start. Eligible new subscribers can try Premium free for 7 days.
On a computer? Scan with your phone's camera to open the app in its store.