꼼꼼계산기 is a free Android app developed by JuShine. It falls under the category of Utilities & Tools and provides a simple and efficient solution for performing basic arithmetic calculations. With this calculator, users can easily perform addition, subtraction, multiplication, and division operations.

The app requires certain permissions to function properly. Users are informed about these permissions, and starting from Android OS 6.0, they have the option to deny these permissions through the device's settings app. One of the optional permissions is storage access, which allows the app to store calculated values in temporary files. However, this permission is not necessary for the normal functioning of the app and does not pose any issues for users.