BRIO Smart Tech Sound is an iPhone app developed by BRIO AB. It falls under the category of Utilities & Tools and is available for free. This app allows users to take full control of their play experience with their interactive toy engine.

With BRIO Smart Tech Sound, users can recreate their play world over and over again. They have the option to choose their favorite sounds for their Smart Tech Sound toys or even record their own sounds. The app also allows users to fully remote control their engine, enabling them to adjust the engine's speed and change the headlights.

It's worth noting that the app requires permissions for Bluetooth and microphone access. However, the app does not store any data and the microphone option is solely used for recording desired sounds.

BRIO Smart Tech Sound offers a seamless and interactive play experience for users, giving them the ability to customize and control their toy engine with ease.