CalculatorFree is a combination of a simple universal calculator and a scientific calculator that is ideal for school, work, and everyday use. Developed by Viktor Kaifer, this app is available for free on Android devices and is ad-free, providing a better user experience.

This calculator app is designed with easy operation in mind, allowing every calculation to be done with just a few taps. With a large display and large keys, users can easily see what's going on and operate the app with fast precision. The app works just as expected, and the timestamped history allows users to go back to previous calculations. The copy and paste functionality is also included, making it easier to work with the app.

With CalculatorFree, users can enjoy a variety of features that include internal precision of 20 digits, percentages, trigonometric functions, and 39 constants. The app also supports multi-window, making it easier to use alongside other apps. The app's small size and lack of unnecessary permissions ensure a smooth user experience. The app also has complete built-in help with examples, making it easier for users to learn how to use it effectively.