Awesome idea—building an AR app that replaces real-world objects (like swapping out an old TV for a new one) is such a practical use case! Here’s a breakdown of the best resources to help you build this for Android and iOS:

• Official Getting Started Guides: ARCore’s core tutorials cover plane detection, anchor creation, and 3D model rendering. There’s a dedicated section on object tracking—you’ll learn how to use image anchors or custom scanned objects to identify your target TV and replace it with a virtual model.
• Deep Dive Technical Article: Look for "ARCore Object Tracking: Replace Real-World Objects with 3D Models"—it breaks down the logic behind training custom object recognition models, handling edge cases like occlusion and lighting changes, and ensuring your virtual model aligns perfectly with the real object.
• Hands-On Sample Project: Check out Google’s ARCore sample repo’s ObjectPlacement project. You can run it out of the box, then tweak the code to target TVs specifically—this is a fast way to get a working prototype.

• Official ARKit Documentation: The "Object Detection and Tracking" section walks you through creating reference objects (either via image recognition or 3D scanning of a real TV) and matching them in an AR scene to trigger replacements.
• Step-by-Step Tutorial: The "Building an AR Object Replacement App with ARKit 4" tutorial takes you from scanning your target TV, creating a recognition dataset, loading a virtual TV model, to syncing its position and orientation with the real object in real time.
• Apple Sample Project: The ARObjectReplacement sample on Apple’s developer site demonstrates how to use ARKit’s image anchors and scene understanding APIs to swap objects. It also includes tips for matching lighting and scale to make the virtual TV look natural in the room.

• Unity with AR Foundation: Unity’s AR Foundation wraps ARCore and ARKit into a single API. Their official "Object Replacement" tutorial guides you through building a cross-platform app, perfect if you’re familiar with Unity’s 3D workflow.
• Unreal Engine AR Framework: Unreal’s AR tools support both platforms too. The "AR Object Tracking" chapter in their docs explains how to set up object recognition, anchor placement, and model replacement with Unreal’s visual scripting or C++.

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