Stackapella Open the app

How it works

Learn a part. Sing it with the others. Share the harmony.

Stackapella teaches you a harmony part by ear, then lets you record every part of a song yourself, one voice at a time, in your browser.

Start singing, it's free Hear four voices
The Sing screen: the part's notes as shapes on a lane with their words, the note to sing now, and each note ticked as you hit it. The Sing screen: the part's notes as shapes on a lane with their words, the note to sing now, and each note ticked as you hit it. The Sing screen: the part's notes as shapes on a lane with their words, the note to sing now, and each note ticked as you hit it. The Sing screen: the part's notes as shapes on a lane with their words, the note to sing now, and each note ticked as you hit it.

Select your voiceFour voices, four steps to your own harmony.

Each voice teaches you something. Sing the part that suits you, then stack more.

Soprano · learn

Start with the tune you know.

Short lessons take you from finding your first note to holding a part on your own. Your notes light up as you hit them.

The course map: the next lesson, today's workout and your week The course map: the next lesson, today's workout and your week The course map: the next lesson, today's workout and your week The course map: the next lesson, today's workout and your week

Alto · a real voice

Learn your harmony from a real singer.

A singer sings your part first. Listen, sing along with them, then sing it on your own. Most songs start with a clear practice voice, and real voices join them part by part.

Tenor · record

Record each part over the others, in time.

Sing the next part while you hear the ones before. A quick timing check measures your headphones, so each take lands right where you sang it.

Bass · share

Share the whole harmony.

Polish it with one switch, then send a link anyone can open, or a short video with the words. Nothing is public until you share it.

No app can replace a real vocal coach. Only a person can hear everything and guide you. That's why Stackapella is built to work with coaches: soon you'll be able to send a coach your takes and learn with them right here.

Your first lesson

From your first note to a harmony

  1. Press Start

    No account and nothing to install. It opens in your browser, on a phone or a computer.

  2. Find your comfortable note

    Sing any easy note. Every exercise after it is fitted to your voice.

  3. Learn a part by ear

    Listen to a guide voice, sing along with it, then sing on your own. Your notes light up as you hit them, and you never need to read music.

  4. Stack it and share it

    Record each part over the ones before, with a quick timing check, then share a link or a short video.

What you hear

Four voices, and one of them is yours.

Every song comes in four parts. Press Play, then switch voices off or bring one forward to hear how the harmony is built.

  • The soprano usually sings the tune; the alto, tenor and bass sing the harmony around it.
  • You choose the part that suits your voice, and you can move the key to fit you.
  • Most songs start with a clear practice voice, and real singers sing some of the parts.

Amazing Grace · first line4 voices · 0:00 / 0:18

Press Play. Tap a voice to bring it forward, or switch one off.

Synthesized guide voices, singing on "oo". In the app, real singers sing some of the parts.

Amazing Grace's first line, "Amazing grace, how sweet the sound that saved a wretch like me.", in four parts: the soprano sings the tune, with the alto, tenor and bass under it. Your part is the Soprano. Press a voice to take it out of the harmony or bring it back.

What you need

Less than you think.

More answers in Help

Press start

Your first voice is the hardest. Let's find it together.

Lesson 1 starts with one comfortable note.

Start singing