What it does
Everything you need to sing harmony
Learn a part with a guide voice, record it, then stack the next one on top. Here's what the app does today, and what's on the way.
Free, in your browser. No account needed to start.
Amazing Grace · first line4 voices · 0:00 / 0:18
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.
UnlockedWorks today
- Learn a part Hear a guide sing your part, sing along, and watch your notes light up.
- The course Short lessons that take you from your first note to every part of a song.
- The studio Record each part over the others, exactly in time.
- Real voices Guide parts sung by real singers, each one credited.
- Share Share a link or a video with the words, or export the mix.
- Create Make your own arrangement: sing the tune, and get the other parts suggested.
- Choir groups Directors share songs, assign parts and see who has recorded what. With Plus
Now loadingOn the way All coming soon
Each one opens here when it's ready.
Built in the open
Stackapella is open source. Here's what that means for you, and for anyone curious how it works.
- The server and the web app are open source, under the Attribution Assurance License.
- Every part is scheduled on the browser's audio clock, so your takes line up exactly in time.
- Your pitch is heard on your device, and nothing tracks you: no third-party analytics, only anonymous daily counts. Check the code.
- No npm and no build step: a Laravel API and a Vue app served as plain files.
- Run it on your own server, with every Plus feature, free.
Who it's for · solo or co-opWho it's for
Pick the one that sounds like you.
- Beginners Never sung harmony? Start here.
- Choir singers Learn your part at home before rehearsal.
- Directors and teachers Share songs with your singers, assign parts and see who's ready.
- A cappella Stack every part of an a cappella song yourself.
- Songwriters Got a tune in your head? Turn it into harmony.
- Singers who play An instrument can be any part.
- Friends and family Sing a harmony together, taking turns.
- Vocal coaches Coaching is coming: review singers' takes through the app, and get paid for it.
Your first voice is the hardest. Let's find it together.
Lesson 1 starts with one comfortable note.