Do I need Bluetooth LE Audio expertise?

No. The point is to reduce that complexity. You work through a simple interface and the open-source ESP32 library; Auracast behavior is handled for you.

Will this fit my existing ESP32 project?

Yes — that’s the goal. Keep your application firmware, integrate with the host library, and add Auracast without redesigning the product around a new stack.

Is the ESP32 library open source?

Yes. You’ll get an open-source host library so you can inspect, adapt, and ship with confidence on the ESP32 side.

Not yet — this page is measuring demand. Use early access above; we’ll email when pre-orders or shipping open.

Do you support OEM / volume?

Yes. Select “Volume / OEM inquiry” on the waitlist and briefly describe volume and use case.

ESP32 Auracast companion

Auracast for ESP32

Drop-in Auracast for ESP32 — companion module, simple UART/I2S API, and an open-source library. Broadcast audio without a full LE Audio stack rewrite.

Get early access How it works

CastBridge Auracast companion module — blue PCB with metal shield

Drop-in Auracast for ESP32

ESP32 is everywhere — makers, products, a strong ecosystem — yet it still offers no Auracast and no practical Bluetooth LE Audio path. Existing projects need drop-in support with a familiar ESP32-style API, not months spent chasing a stable LE Audio stack alone.

CastBridge drop-in Auracast modules on ESP32 development boards

CastBridge adds Auracast to your ESP32

Companion module, predictable API, and an open-source ESP32 library — Auracast without a Bluetooth LE Audio rewrite.

Auracast solution for ESP32

All LE Audio complexity stays on a companion module. Familiar links like UART and I2S drive a predictable API from an existing ESP32 project — no stack rewrite on the host.

Fast time to market

A well-crafted feature set keeps the first steps small: avoid Bluetooth complexity and get basic Auracast running in no time, then grow into more when the product needs it.

Open source ESP32 library

An open-source ESP32 library makes the path as seamless as possible — familiar ESP32 patterns, Auracast up with a couple of lines of code.

Integration diagram — ESP32 connected to CastBridge over UART and I2S audio

Auracast for makers, teams, and OEMs

Electronics maker kit — Arduino, sensors, breadboards, and modules for prototyping

Makers and prototypers

Auracast on an ESP32 project without learning LE Audio end to end.

Software engineer working in a code editor — product team development

Product teams

Add broadcast audio to an existing ESP32 SKU without a full stack redesign.

Panelized green PCBs ready for volume manufacturing

OEMs

Evaluating Auracast for volume — join the waitlist and mark volume interest.

CastBridge pricing

Module, Dev Kit, docs, and an open-source ESP32 Auracast library.

ESP32 Auracast module

Pre-flashed nRF53 module, ready to solder onto a PCB. Drop-in Auracast companion for existing ESP32 designs.

$30 / pcs

Join waitlist

ESP32 Auracast Dev Kit

Module soldered on a dedicated Arduino-layout board — easier bring-up without a custom PCB.

$90 / pcs

Join waitlist

Documentation

Extensive docs unlocked with a module purchase — integration guides, API reference, and bring-up notes.

Included

Join waitlist

Open-source ESP32 Auracast library — short sketch.ino code sample

Open-source library

Open-source host driver on GitHub. Familiar ESP32 patterns — free forever.

Free

Join waitlist

Early access to Auracast on ESP32

We’re validating demand for an ESP32 Auracast solution that doesn’t fight you. Join the list if you want seamless integration, the open-source library, and a simple path to broadcast audio — or if you need volume later.

CastBridge module soldered onto a product PCB

ESP32 Auracast FAQ

Do I need Bluetooth LE Audio expertise?: No. The point is to reduce that complexity. You work through a simple interface and the open-source ESP32 library; Auracast behavior is handled for you.
Will this fit my existing ESP32 project?: Yes — that’s the goal. Keep your application firmware, integrate with the host library, and add Auracast without redesigning the product around a new stack.
Is the ESP32 library open source?: Yes. You’ll get an open-source host library so you can inspect, adapt, and ship with confidence on the ESP32 side.
Can I buy today?: Not yet — this page is measuring demand. Use early access above; we’ll email when pre-orders or shipping open.
Do you support OEM / volume?: Yes. Select “Volume / OEM inquiry” on the waitlist and briefly describe volume and use case.