Public preview · spec subject to change

Music in every room. Art on every screen. Lights on the beat.

All in sync. All under your control. Sendspin is the open standard for the complete music experience throughout your home, from the Open Home Foundation.

Try the live demo See how it works
Sendspin
Side A · 33⅓ rpm
<1ms
Sync precision across rooms
FREE
Forever · no strings
100%
Local-network audio
7
Open-source SDKs
The whole room, in sync

Other multi-room systems just play sound.
Sendspin orchestrates the whole room.

Artwork, metadata, controls, and visualization are built into the protocol from day one. No other multi-room standard does this.

Sound

High-quality audio, in sync across every speaker. Each one gets a stream matched to what it can play — lossless to your hi-fi, efficient to the kitchen smart speaker — all locked to the same beat.

Screens

Album art and now-playing info on every tablet and display. The hallway wall panel becomes a Now Playing screen. The kitchen shows what's on without anyone reaching for a phone.

Controls

Any screen becomes a remote. Skip, pause, change volume from anywhere in the house — phone in your pocket or tablet on the wall, it's the same set of controls.

Lights

LEDs and smart bulbs react to the music in real time. Bass on the floor lamp, mids on the strip behind the TV — in sync with what you're hearing.

Live demo

Try Sendspin in your browser.

No install. Open this page on multiple devices, press Start listening on each one, and hear them lock together.

1 Open this page on a laptop, phone, and tablet — anything with a browser.
2 Press Start listening on each device.
3 Walk between them. One song. No echo.
Now playing Pizza Hat · Johan Althoff
Perfect sync · No echo

One song. Every room. Locked to the same beat.

Microsecond-precise timing keeps every speaker in step. Walk between rooms and the music stays one song, not an echo chamber.

Devices find each other automatically on your home network — no IP addresses, no port forwarding. A quick pairing step keeps the audio between them encrypted, so your music stays in your home.

Read the protocol

Live timing

±0.5 ms · 4 rooms
Living room
0.3 ms
Kitchen
0.4 ms
Bedroom
0.2 ms
Hallway
0.5 ms
Open · Local · Yours

Your music,
in your home,
on your terms.

Sendspin doesn't lock you into a brand or a cloud. It's an open standard, run on your own network, governed by a non-profit. Nothing about your music leaves the house.

Mix any brand.

Speakers, screens, and lights from different makers all work together. Buy what fits your home, your ears, and your budget — not what one ecosystem allows.

Keep what you have.

Sendspin runs alongside AirPlay and Cast, so your existing speakers don't have to go in the bin.

No cloud account.

Everything stays on your home network. No login, no telemetry, no listening data sent off to Big Tech. Music keeps playing through internet outages.

Built to last.

Backed by the Open Home Foundation, a Swiss non-profit. Sendspin can't be bought out, paywalled, or shut down on a corporate whim.

Start small · Grow as you go

Add rooms one at a time.

Sendspin itself is free. Pick a path and add a single room. Every new device joins the existing setup automatically — no rewiring, no re-pairing the rest of the house.

01 · Buy ready-made

Voice Preview Edition

$59/ room

The Home Assistant Voice PE ships with Sendspin out of the box.

02 · Stream your music

Music Assistant

Free/ house

Run Music Assistant on a Raspberry Pi or any home computer. It sources the music and sends it to every Sendspin device on your network.

04 · Build your own

ESP32-S3 + DAC

<$20/ room

Comfortable with electronics? An ESP32-S3 with a DAC running ESPHome is a Sendspin speaker for under twenty bucks.

Already have a Pi running Music Assistant? You're already running Sendspin.

Works with Sendspin

Built by partners.
Open to anyone.

A growing roster of software and hardware partners ships with Sendspin support today. The protocol is open — anyone can join.

Music Assistant
ESPHome
LedFx
Home Assistant Voice PE
More coming

Building something with Sendspin? Say hi in #sendspin-beta-testing on the Music Assistant Discord.

Build with Sendspin

The spec is open and free to implement.

Hardware or software, anyone can build with it. Certify once; listeners hear the difference forever.

For hardware makers

Make your speaker part of the song.

Wear the "Works with Sendspin" mark and join a growing ecosystem of speakers, displays, and lights that listeners can mix and match.

Become a partner
For software developers

Add Sendspin to your app, server, or driver.

Open spec, plus official SDKs in seven languages. The reference client and server are Apache 2.0 licensed.

C# C++ Go JavaScript Python Rust Swift
Read the spec Browse the SDKs