Are you interested in exploring 3D models on your mobile device or in virtual reality? Whether you're a designer, architect, or simply a curious individual, there are several apps available that allow you to view and interact with 3D models in a variety of ways. Here are the top 5 apps for viewing 3D models:

1. Sketchfab: Sketchfab is a popular platform for discovering and sharing 3D models. With the Sketchfab app, you can explore thousands of 3D models uploaded by creators from around the world. You can view models in augmented reality, allowing you to place them in your real-world environment and interact with them from all angles.

2. Blender: Blender is a powerful 3D creation suite that also offers a mobile app for viewing 3D models. While the app doesn't have the full functionality of the desktop version, it allows you to view and inspect 3D models on your mobile device. It's a great tool for professionals who need to review models on the go.

3. Augment: Augment is an app that specializes in augmented reality, allowing you to place 3D models in your physical space and interact with them as if they were really there. Whether you're visualizing furniture in your home or showcasing products in a retail environment, Augment provides a seamless AR experience.

4. Gravity Sketch: Gravity Sketch is a virtual reality app that lets you create and view 3D models in a fully immersive environment. With intuitive tools and a user-friendly interface, Gravity Sketch is perfect for anyone who wants to dive into the world of VR design and exploration.

5. BIMx: BIMx is an app designed specifically for architects and building professionals. It allows you to explore 3D building models and navigate through them with ease. BIMx also supports virtual reality, giving you the option to experience architectural designs in a more immersive way.

These apps offer unique experiences for viewing 3D models, whether you're interested in augmented reality, virtual reality, or simply exploring models on your mobile device. Try out a few of these apps to see which one best suits your needs and preferences. Happy exploring!