WebXR on Meta Quest currently supports immersive VR sessions but not immersive AR. That’s why your app remains confined to a browser window, even when sideloaded as an APK. The passthrough camera and spatial tracking required for immersive AR are not exposed to web technologies on Quest.

To build a fully immersive AR experience, you’ll need to use native tools like Unity with the Meta XR SDK. These provide access to the device’s passthrough and spatial APIs, enabling marker detection and real-world overlays. Meta’s Spatial Framework is another option, though it also requires Unity.

In short: immersive AR on Quest isn’t possible with just WebXR and PWA. Native development is currently the only viable path.