Calculator by ATNSOFT is a free app for Android that offers users a convenient and user-friendly way to perform calculations. With its ergonomic on-screen keyboard and voice input, users can instantly enter numbers and mathematical expressions in English and many other languages. The app also allows users to make two or more calculations simultaneously by switching editing screens with a horizontal swipe along the top edge.

In addition, Calculator records all calculations in the calculations history, where users can insert the expression and result into the editor. Users can also execute mathematical operations with incredibly large numbers and expressions, raise to the n-th power, extract the root of the n-th power, and perform percentage calculations. The app also offers convenient, user-friendly settings that can be opened by swiping from the left edge of the screen or using a menu button.

However, the free version of the app comes with some restrictions, such as only 5 screens (pages) to switch, only 5 memory cells, and an advertising banner. But users can get the Pro version for free by creating an interesting YouTube video, article, blog post, or quality translation of the application texts into another language.