CombinatorOne screen plays the music. Every phone in the room becomes an instrument.

Free, in the browser. Friends join by scanning a QR code: no app, no account.

Start a jam (free)
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1

Big screen

Open Combinator on a laptop or TV and plug it into the best speakers in the room.

2

Scan

Everyone scans the QR code on the screen. Each phone becomes drums, bass, keys, a sampler or the effects.

3

Play

Hits land on the beat, in key. Record the jam into a song, edit it in the piano roll and timeline, export it.

🥁 Made for the room

A room full of phones plays through one sound system, locked to one clock. Nobody needs headphones.

🎹 A real sequencer

Patterns, piano roll, song timeline with fades, automation and motion recording, on the laptop and on every phone.

🎚 Mix it properly

Volume and pan for every channel and every drum voice, a 6-band EQ and a compressor with a tube mode.

🔊 Sounds included

Sampled drum kits, loops, instruments and wavetables, all free to use in the music you make.

Questions

Does everyone need an account?

No. Only the person who opens a jam signs in, with a code we email them (no password). Phones join with the QR code.

What do I need?

A laptop (Chrome, Edge or Safari) with speakers, and phones. Wired or HDMI speakers feel tighter than Bluetooth.

Do the phones have to be on the same Wi-Fi?

It's best, but not required: phones on mobile data can join too. Same Wi-Fi gives the lowest delay.

Can I keep what we made?

Yes. Songs save to your account, you can download the song file, and "Record audio" exports the audio (the last 5 minutes are always kept, too).

What do you do with my data?

We store the host's email, saved songs and, if you ticked the box, your consent to news emails. No ads, no analytics, no selling. Details in the privacy notice.

Guides

Ready when the room is

Start a jam (free)