Calculator, developed by Mohammed Benguedda, is a free Android application that provides a convenient solution for performing basic and engineering calculations. This app is designed to work on all Android devices and can be used for simple arithmetic operations as well as complex scientific calculations.

One of the key features of this app is its ability to perform four fundamental operations, including addition, subtraction, multiplication, and division. Users can also perform engineering calculations by simply rotating their phone. The app also allows users to check their calculation history by tapping on the calculation history button. Moreover, users can use previously inputted formulas by tapping on the formula they need from the calculation history.

Overall, the Calculator app is a handy tool for anyone who needs to perform basic and engineering calculations on the go. With its user-friendly interface and convenient features, this app is a must-have for all Android users.