Solfio app icon — two glowing points joined by a curve, one low and warm, one high and cool

Five intervals a day. Same for everyone.

The free daily ear training game — Wordle, for your ears.
No subscription. Ever.

Coming to the App Store Coming to Google Play
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SOLFIO 88 · 4/5 · 🔥 21-day streak — "the tritone got me again"

How it works

1 · Listen. Two notes play — sometimes apart, sometimes together. What interval is it?
2 · Guess. Twelve buttons: m2 to octave. Five rounds. Two minutes.
3 · Compare. Everyone on Earth got the same five today. Share your spoiler-free grid and find out who's really got ears.

Why musicians keep coming back

Interval recognition is the foundation of relative pitch — and the part of aural-skills class everyone procrastinates. Solfio turns it into a two-minute daily ritual with a streak worth protecting. Your stats screen tracks accuracy per interval, so when the tritone beats you three days running, you know exactly what to drill.

Built for real training

Roots span two octaves in a warm piano timbre. Later rounds go harmonic — notes together — the way exams and real music actually sound. Solfio Pro adds unlimited practice sets targeted at your weakest intervals.

How Solfio compares

PriceModelDaily shared game
SolfioFree · Pro $4.99 onceNo subscription
EarMaster$5.99/mo or $43.80/yrSubscription
Tenuto$4.99One-time
Functional Ear Trainerwas $19.99Moving to subscription
ToneGym$18.95/moSubscription

They're drill tools. Solfio is the daily game you play alongside them.

Frequently asked questions

What is Solfio?

A free daily ear training game. Five intervals a day — the same five for every musician on Earth. Guess each one, build a streak, share your grid. About two minutes.

Is Solfio free?

Yes — the daily game is free forever with no ads. Solfio Pro (one-time purchase) adds unlimited practice mode and full analytics. No subscription.

What intervals does it test?

All twelve within an octave: minor 2nd, major 2nd, minor 3rd, major 3rd, perfect 4th, tritone, perfect 5th, minor 6th, major 6th, minor 7th, major 7th, octave.

Does it help with ABRSM / RCM / college aural skills?

Yes. Interval recognition is core to every aural-skills syllabus, and daily spaced practice is the proven way to build it.

Who is Solfio for?

Music students, choir singers, band and orchestra players, producers, teachers — anyone who's ever been asked "what interval was that?" and guessed wrong.

Is it a subscription?

Never. Free daily game, one-time Pro unlock. That's a promise.