Circle Calculator, developed by 57derajat, is a free Android application designed to help users perform circle calculations with ease. The app provides a simple and user-friendly interface that makes it easy to calculate the area, circumference, diameter, and radius of a circle.

With Circle Calculator, users can input the value of any parameter and the app will automatically calculate the remaining parameters. This makes it an excellent tool for students, engineers, and anyone who needs to perform circle calculations quickly and accurately.

The app also includes a handy history feature that keeps track of previous calculations, allowing users to refer to them later. Overall, Circle Calculator is a useful and practical app that does what it promises without any frills or unnecessary features.