Windsurfing Calculator is a lifestyle app developed by Viktor Z for Android devices. It is a GUI wrapper of the well-known Windsurfing and Kitesurfing Calculator of James Douglass. The app allows users to calculate the equipment needed for windsurfing and kitesurfing based on their weight, board type, and wind speed. The app is free and has no ads.

The app's features include calculating the sail, board, fin, kiteboard, and kite size required for efficient windsurfing and kitesurfing. However, the free version has some features disabled, such as favorite sails/kites filtering, advanced fin calculation, and mast compatibility chart. Despite this limitation, Windsurfing Calculator is an excellent app for windsurfing and kitesurfing enthusiasts looking for a user-friendly tool to calculate their equipment needs.