The ear training app that tells you exactly what you keep missing.
Every other app makes you finish drills. Fifths shows which intervals, which scale degrees, which keys keep tripping you up — then drills those specifically.
Free to try, no signup · Cancel anytime · 14-day refund · No ads, ever
Your heartbeat shows up after one session.
You already generate this data every session. Most apps throw it away. We make it the product.
How it works
Practice in key.
Every drill lives inside a real key — not disconnected intervals floating in space. Scale-degree-first training.
Every answer feeds the matrix.
We track confusions, directions, presentations, which scale degrees fooled you.
Your weakness map tells you what to drill.
Auto-generated sessions target the specific gaps. No more "just practice more."
Designed around what breaks
Confusion matrix you can read
See which intervals you mix up at a glance. 12×12 grid, clickable, honest.
Scale-degree training, not just intervals
Hear a minor 3rd from the 5th differently than from the root. We test both.
Sing back to check yourself
Mic-input beta scores your cents accuracy. Works on Chrome & Safari desktop.
Vocal range aware
Set your comfortable range once; drills transpose automatically. Free.
How Fifths compares
Nothing against EarMaster or Sonofield — they do a lot right. We're betting the analytics are what's missing.
| EarMaster | Sonofield | Fifths | |
|---|---|---|---|
| Price | $3–6/mo | $18.95/mo | $4.99/mo |
| Shows you what you're missing | ✗ | ✗ | ✓ |
| Scale-degree, in-key training | limited | ✓ | ✓ |
| Works on web | desktop app | iOS only | ✓ anywhere |
| Sing-back scoring | limited | — | ✓ beta |
| Lifetime tier | ✗ | ✗ | $99, first 100 |
| Total lessons at launch | 2,500+ | ~200 | ~30 (growing monthly) |
Inside a lesson.
Short, focused, scored. Each lesson lives inside a real key — you hear it, identify it, and the app tells you exactly what tripped you up.
Pricing — fair and clear
Free forever. Pro unlocks unlimited history, weak-item drill sessions, and mic-input scoring.
- Full curriculum
- Last 7 days of stats
- No signup needed
- Unlimited history
- Weak-item drill sessions
- Mic-input pitch scoring
- Everything in Pro Monthly
- ~$3.33/mo equivalent
- Cancel anytime
- All Pro features, forever
- Future curriculum included
- Closes after 100 sales
Cancel anytime · 14-day full refund · No ads, ever
Frequently asked
Why another ear training app?
Because the other ones make you finish drills without telling you what you're failing at. Finishing isn't the same as getting better. We show you.
Is there a free tier?
Yes, forever. Full curriculum, 7-day analytics. Pro unlocks unlimited history, mic input, and "practice your weak items" auto-sessions.
When does it launch?
Live now at app.fifths.io. The $99 lifetime is reserved for the first 100 seats — once they're claimed, the tier closes forever.
How is this different from EarMaster?
EarMaster has the content library — 2,500+ lessons. We have the analytics. If you've already outgrown a beginner app but still can't transcribe a pop song, you're our audience.
Do I need a piano?
No. Runs on any browser. Piano samples built in.
Will it work on iPhone?
Web works today on any phone. Native iOS and Android apps are on the roadmap after launch.
Your ear has patterns. We'll find them.
Practice for free at app.fifths.io — no signup needed for the first lessons.
Want the lifetime tier instead?