Rad 3D is an iPhone app developed by Vincenzo Tschinke. It is a free app in the Lifestyle category, specifically designed for bicycle wheel builders. With Rad 3D, users can explore various lacing patterns in 3D, ranging from radial to four-cross.

The app allows users to select their desired wheel from the information pane and easily add or remove groups of spokes using the "forward" and "back" arrows. Users can also interact with the wheel by performing swipe gestures to move it around its center, and pinch and two-finger swipe gestures to zoom and pan. Double-tapping the screen resets the view to the default position. Additionally, users can tap on the hub to make the wheel rotate on its axis.

One notable feature of Rad 3D is the ability to take pictures of the displayed wheel using the camera icon. These pictures can then be shared or saved with a choice of black, white, or transparent backgrounds.

Overall, Rad 3D provides a user-friendly and visually appealing interface for bicycle wheel builders to explore different lacing patterns in 3D. It offers a range of customization options and the ability to capture and share wheel designs. Whether you're a professional wheel builder or simply interested in the art of wheel lacing, Rad 3D is a valuable tool to have.