I need a lean, cross-platform AR app that can read a QR code, fetch the referenced 3D asset, cache it locally, and immediately overlay it on the live camera stream. Both Android (ARCore) and iPhone (ARKit) must be supported with identical behaviour and a clean, clutter-free UI. 3D assets will be supplied by me in the correct resolution and format; you will not need to create or optimise the models, only render them accurately in real scale. My preference is to bundle these assets inside the app so the experience works offline, but if package size becomes an issue I will give you access to a small HTTPS server from which the files can be downloaded on first launch. Core flow I am after: 1. The user points the camera at a QR code. 2. The app resolves the code into a specific model ID or URL. 3. If the model is already stored locally, load it instantly; if not, download it once, cache it, then load. 4. Display the model anchored in the real world with basic pinch/rotate gestures enabled. 5. Provide a lightweight menu to clear the cache and rescan. Deliverables • Full source code and build instructions for Xcode and Android Studio • Signed APK + iOS TestFlight build ready for submission • Brief README covering SDK versions, permissions used, and how to add/replace models Acceptance criteria • QR scan to render time under three seconds on mid-range devices • Accurate model scaling and smooth tracking in normal indoor lighting • No more than one crash or memory leak detected after thirty minutes of continuous use Timeline: a working prototype in a week would be perfect; a polished, store-ready build within one month is my fallback.