How to harmonize with yourself

Updated November 1, 2026

You can sing harmony with yourself using a phone and a pair of headphones. Record yourself singing a tune, play the recording back, and sing a second line over it. The recording keeps going whether or not you’re on your note, so it works like a partner who never gets tired.

The app you need depends on your goal. Some apps help you build a track with your voice on every part, some create the harmony for you, and Blend teaches you to sing the second line yourself and grades it.

How to do it, step by step

Choose a tune you know well. Short, slow tunes work best, such as “Twinkle, Twinkle, Little Star.”
Record the melody. Use a metronome if your app has one, so the recording keeps a steady beat.
Put on headphones. Without them, your phone records the tune coming out of the speaker along with your new line.
Find your first note.A third above is the easiest harmony to start with: go up two scale steps from the tune’s first note and hold it.
Sing the second line over the recording. Copy the shape of the tune, staying two scale steps above it.
Listen to both lines together.Go back to any spot where your line landed on the tune’s note, and sing that spot alone a few times.

Hear what you are aiming for

This is the shape of a third above. Your line is the upper one. Solo it, sing it, then play both and sing it against the tune.

“Ode to Joy” with a third above

Your line is the melody’s shape, two scale steps higher. It rises and falls exactly when the melody does.

Blend can check your singing. Its lessons mark every note on the staff as you sing it.

Try a lesson

Apps that record your voice in layers

GarageBand on Apple devices and BandLab on iPhone and Android let you record one track and sing another over it. Acapella from PicPlayPost is built for multi-part vocal videos, and it’s free to download with in-app purchases. These apps are a good fit if you want a finished recording to keep. None of them tells you whether you sang the right notes.

Apps that create the harmony for you

Solo Harmony ($0.99) and Harmonizr ($4.99) listen to you sing and generate harmony voices from your voice in real time. They’re made for performing and producing, and you don’t sing the second line yourself, so they won’t teach you to hold one. We checked these listings on November 1, 2026, and prices may change.

An app that grades the line you sing

Blend turns harmonizing with yourself into a lesson. On every second clip of most lessons, you sing the tune first and Blend records it. You sing it again if too many notes miss, and after three misses Blend offers to play the tune for you. Then you sing the harmony over your own voice while your microphone grades every note, and the reveal plays both of your voices together.

Blend isn’t a recording studio. You sing its clips and songs, such as “Jingle Bells,”instead of a song you bring yourself, and your takes last only for the length of the clip, so you can’t save them. You need headphones, and half speed is off while the tune is your own recording.