Trevo is a simple and easy-to-use lottery number generator that can be used to generate numbers for different types of lotteries. The app is available on the Android platform and is developed by João Sousa. It is a free app which doesn't require any special permissions and is completely ads-free.

The app comes with a minimalist user interface that is easy to navigate. The main screen allows you to select the type of lottery you want to generate numbers for and the number of balls in the draw. Once you select the options, simply tap on the 'Generate' button to get your numbers. The app generates the numbers randomly, ensuring that every draw is unique.

Overall, Trevo is a great app for anyone who wants an easy-to-use and efficient lottery number generator. It doesn't have any unnecessary features and is completely free to use.