How do I play music on several devices at once?

Install Allsono on every device, make one the source and choose "Use as speaker" next to the others. Allsono sends the sound over your Wi-Fi and keeps every device exactly in time.

Does Allsono work with Spotify?

Yes, with a Mac as the source: Spotify, YouTube, podcasts and other apps all share their sound. On Android, Spotify doesn't let other apps capture its sound; Allsono then tells you and keeps the sound on the phone itself. Send Spotify to your Mac with Spotify Connect instead and make the Mac the source. YouTube, YouTube Music and most other apps do work on Android. On iPhone, Apple Music can't be shared.

Can my iPhone be the source?

Yes, with one limit set by Apple: iOS doesn't let any app delay or mute the sound of other apps. All speakers then play exactly together, but the iPhone itself runs slightly ahead. Have a Mac? Then make the Mac the source: everything plays exactly together. With Spotify Connect or AirPlay you can still control the music on the Mac from your iPhone. Without a Mac, turn the iPhone itself down.

What about delay or echo?

All speakers play the same fragment at the same moment, within a few milliseconds on a good Wi-Fi network. Only an iPhone that is itself the source runs slightly ahead (see above). Allsono also measures and compensates for the delay of Bluetooth and AirPlay speakers.

The sound only travels over your own Wi-Fi network. Internet is only needed to sign in and check your subscription daily; offline, Allsono keeps working for up to three days.

Which devices does Allsono support?

Macs with macOS 14.2 or later, Android phones with Android 10 or later and iPhones with iOS 17 or later. You can mix them freely.

What does Allsono cost?

Nothing. Allsono is in beta and free: create an account and use the apps on all your devices. If that ever changes, we will let you know well in advance.

Using your iPhone as the source

Updated 29 October 2026

An iPhone with iOS 17 or later can be the source. Apple only lets apps share other apps' sound through a screen broadcast, so that is how Allsono works on the iPhone.

How to start

Open Allsono and tap "Make this iPhone the source".
Read the "This iPhone runs ahead" notice and continue.
Pick "Allsono" in the broadcast sheet and tap "Start Broadcast". Allsono only uses the sound, never the picture.
Pick the devices that should play along with "Use as speaker" and start your music.

Why the iPhone itself runs ahead

The speakers wait a moment so they can all play exactly together. iOS doesn't let any app delay or mute the sound of other apps, so the iPhone itself plays straight away and runs a fraction ahead.

The fix is simple: mute the iPhone itself or turn it right down. Then you only hear the speakers, and they are exactly in time. Have a Mac? Make it the source; with Spotify Connect or AirPlay you still control the music from your iPhone.

Which apps work

Most apps share their sound through the broadcast. Music from Apple Music can't be shared; Apple itself prevents that.

Try it yourself
Allsono is in beta and free for Mac, Android and iPhone.

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