Simple Calculator: Quick math is a free Android app developed by Simple Mobile Tools. It is a stylish and modern calculator that offers a great user experience. The app comes with a dark theme that is easy on the eyes, making it easy to see buttons and numbers clearly. It can be used for simple calculations, as a currency converter, or as a mortgage calculator.

The app offers many basic functions, including multiplying, dividing, root and powers. You can also make it vibrate on button presses to give you more confidence while inserting your values. Moreover, the lack of internet access makes it more secure and stable than other apps. It is fully opensource, provides customizable colors, and contains no ads or unnecessary permissions.