3D Viewer is a lightweight CAD viewer with powerful capabilities. 3D Viewer allows the user to view and interact with CAD data directly on iPad and iPhone devices. User can easily zoom, pan and rotate the 3D model with a multi-touch gesture. Sample files are provided with the application and it is also very easy to import custom models. The app has been registered for an open event so that user can directly click on the email attachment, web downloads, Dropbox, Box and any other cloud storage applications and 3D Viewer app will launch automatically and load the 3D model from the file. 3D Viewer is integrated with Box and Dropbox cloud storage through which user can directly browse their files in the application itself.