SketchUp Viewer is an Android app that allows users to view and present their own SketchUp projects or explore millions of free models in 3D Warehouse. The app supports various features such as opening or downloading models directly from 3D Warehouse, Trimble Connect, and Dropbox. It also supports Android's Storage Access Framework, making it easy to open models from Google Drive and other file storage apps. The app also has augmented reality (AR) viewing features that allow users to merge their 3D models with the world around them.

Users can navigate using multi-touch gestures for orbiting, panning, and zooming. They can also choose to view their projects from any of the standard views or Scenes that they may have created in SketchUp's desktop and web modelers. The app supports various scene properties such as Camera location and properties, Hidden Geometry, Shadow settings, Visible Layers, Active Section Planes, Standard Edge Styles, Face Styles, Background/Sky/Ground Style settings, Watermarks, and Axes Location. The AR feature is designed to work on a wide variety of qualified Android phones running Nougat (7.0) or higher.

SketchUp Viewer is recommended for Android phones or tablets running Marshmallow (6.0) or higher with a minimum of 1024Mb of RAM. Users should note that the End User License Agreement can be found on the SketchUp website.

Overall, SketchUp Viewer is a useful app for those who want to bring their 3D models to life on their Android phone or tablet. With its various features and scene properties, users can easily navigate and present their projects or explore millions of free models in 3D Warehouse. The AR feature also adds an extra layer of interactivity and immersion to the app.