Natively readable on Android and iOS,
No need for an app.
An AR Code is universal, it is scannable by default on iOS and Android devices.
The "Immersive" AR rendering is supported on iOS>13.0 (ARkit), Android>9.0 (ARCore), older OS versions will have access to a "WebAR" rendering flying over the code. The WebAR rendering is supported on Android>4.4 and iOS>11.0 devices via an AR marker (AR.js technology).