A smiling man with a gray goatee sits at home holding his trombone

Learn trombone. tonestro listens.

Your first song in 10 minutes. On your own trombone.

Get started 7 days free · iOS & Android

Over 1 million
downloads

You play. tonestro listens.

Every note, every slide position, in tune and in time. Miss one, and tonestro hears it.

A woman plays the trombone on her sofa while a tablet on a stand shows her lesson

9:41

Ode to Joy

Learn trombone, step by step.

Two courses made by music teachers take you from your first notes to your first songs.

Slide positions See the position for every note in the app.
Slow it down Practice tricky bars at 80% or 60% speed.
Weekly challenge Play the same song as musicians around the world.

It's never too late to start.

Never played? Start with your very first notes.
Played in a band years ago? Choose your course and pick up where you left off.

A white-haired woman in her sixties beams on her sofa with her trombone across her lap

Getting started with the trombone

The trombone has a slide instead of valves: you find each note with your arm and your ear, so listening matters from the very first day. That makes feedback especially useful. tonestro listens to every note and shows you right away whether it was in tune and in time.

Play a little on most days and let your lips rest. Slow tricky passages down, then speed them up.

What you need

Your own trombone
An iPhone, iPad or Android phone with an internet connection
A few minutes on most days

Not just trombone. The whole family.

One plan for up to six people. Everyone picks their own instrument.

See the Family Plan

A mother watches her teenage daughter practice the trombone with a tablet on a stand

Questions about learning trombone

Can I learn trombone as an adult?

Yes. tonestro goes step by step, at your own pace, and listens to every note you play.

Can I practice with a silent brass system?

No. tonestro needs the real sound of your trombone. Silent brass systems, practice mutes with headphones and external microphones are not supported.

Does tonestro show the slide positions?

Yes. The chart in the app shows the slide position for every note.

Do I need to read music?

No. The courses teach you to read music while you play, and you can show note names while you learn.

How soon will I play my first trombone song?

In your first 10 minutes. You play one or two notes along with a real song and a band: small at first, but real music. Full speed comes later, as your ear and your slide arm work together.

Which devices can I use?

Trombone lessons run on iPhone and iPad (iOS 15 or newer) and on Android phones (Android 8 or newer, at least 4 GB of memory). tonestro needs an internet connection.

What does it cost?

You can try tonestro free for 7 days with the yearly plan. The app shows you the price before you buy. If you cancel at least 24 hours before the trial ends, you won’t be charged. You can cancel in the app under Profile → Settings → Manage Subscription.