Simplest Calculator - Fast E is a free calculator app for Android users developed by TENT. It is a basic calculator that performs all the essential arithmetic operations such as addition, subtraction, multiplication, and division. The calculator has a simple and user-friendly interface that makes it easy for users to perform quick calculations on the go.

The app has a soft sound that plays while performing calculations, which adds a touch of fun to the experience. Additionally, the calculator has a large calculation area, making it easy for users to input their calculations. Any input errors are quickly identified, making it easy to correct mistakes. The app also follows the DMAS (Divide, Multiply, Addition, Subtraction) rule, ensuring accurate calculations every time. Finally, the app supports different screen sizes, making it ideal for use on a range of Android devices.