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.
Launching 2026 · $4.99/mo · free tier forever · $99 lifetime for the first 100
interval?
What your practice looks like after a week
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) |
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?
Summer 2026. Waitlist gets early access and a shot at the $99 lifetime (capped at 100 seats, never reopens).
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.
Be first in when we launch. Waitlist seats get the $99 lifetime before anyone else.