rWinding is a free utility and tools app developed by Aleksandr Malishev for Android. The app is designed for users who want to calculate the parameters of transformers and inductors. The app provides theoretical and practical values for the components, allowing users to get results based on their own experiments. This app has a simple and easy-to-use interface that makes it easy for users to calculate the parameters of the components.

The app allows users to calculate the parameters of transformers, including DC-DC converters and HF transformers on ferrite cores. Users can also determine whether it is possible to wind a transformer or choke on a ring, the dimensions, inductance, and maximum current. The app also calculates the required amount of wire needed for the transformer. Overall, rWinding is a useful app for those who are interested in electrical engineering and need to calculate the parameters of their components.