RPN Calculator is a free Android application developed by ATH0. It is designed to replace the standard Android calculator and features large buttons optimized for touchscreen use. The calculator operates using Reverse Polish Notation, which allows for efficient and flexible calculations. It uses high accuracy decimal arithmetic internally and has a fixed point scrollable display.

One of the main advantages of RPN Calculator is its simplicity. It is easy to use and does not have any unnecessary features that can slow down the calculation process. Additionally, the code for the application is open source and available on GitHub, which allows users to contribute to its development and improve its functionality.

Overall, RPN Calculator is a reliable and efficient four-function calculator for Android that is perfect for users who need to perform quick and accurate calculations on the go. If you encounter any issues or bugs, you can contact the developer at