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 perfectly in sync, but the iPhone itself runs slightly ahead. Have a Mac? Then make the Mac the source: everything plays perfectly in sync. 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 speakers.

No. The sound travels over your own Wi-Fi network, never over the internet. You only need internet to sign in, which is optional.

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.

Can I use a Bluetooth speaker?

Yes. Connect the speaker to a device that plays along as a speaker; Allsono measures the speaker's delay and accounts for it. Don't connect it to an Android phone that is the source: most Bluetooth speakers stay silent there.

What does Allsono cost?

Nothing. Allsono is free, on all your devices, and you don't need an account for it.

How to play Bluetooth speakers in sync

Updated 31 October 2026

A Bluetooth speaker turns a phone or laptop into a proper speaker in no time. Allsono keeps it in time with the rest, as long as you connect it to the right device.

Why Bluetooth lags behind

A Bluetooth speaker plays the sound 100 to 300 milliseconds after the device it is connected to, and that differs per speaker. Allsono reads that delay from the device and starts the speaker exactly that much earlier.

How to connect a Bluetooth speaker

Connect the speaker over Bluetooth to a device that will play along as a speaker: a second phone, a Mac or an iPhone.
Make another device the source.
On the source, tap "Use as speaker" next to the device with the speaker.
Does the speaker still sound slightly ahead or behind? Adjust it with "Fine-tune": if it runs ahead, choose +; if it runs behind, choose −.

Not on an Android phone that is the source

As the source, Allsono sets the phone's media volume to 0 so you don't hear the unsynced original. Most Bluetooth speakers take over that volume and then stay silent. Allsono shows a notice when that happens. Connect the speaker to a device that plays along as a speaker instead.

A Mac with a Bluetooth speaker stutters

AirDrop, AirPlay and Handoff make a Mac's Wi-Fi jump briefly to another channel now and then. With a Bluetooth speaker attached, the Wi-Fi can then drop out for a second and the music stutters.
Allsono notices and shows a notice, with a button to the right settings.
Set AirDrop to No One and turn off AirPlay Receiver and Handoff in System Settings › General › AirDrop & Handoff.
Rather not turn anything off? Play through the Mac's own speakers, or connect the Bluetooth speaker to a phone.

The first half minute

When a speaker with a long delay joins, or the network stalls, Allsono enlarges the buffer so every speaker can keep up. At that moment all speakers line up again once; you hear that as a very short break. After that it stays calm, and after a minute without trouble the buffer comes back down.

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

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