A calculator built around the HP 16C

JRPN 16C is designed for people who want the feel of the HP 16C, a programmer's calculator, on an Android device. The app is intended to reproduce the original's appearance and behavior, so it suits users who are comfortable with hexadecimal notation and stack-based Reverse Polish Notation (RPN). The description notes that users unfamiliar with these concepts may find the app is not a good fit.

Display and number entry

The app uses a seven-segment display modeled on the original calculator. According to the description, entering numbers produces a subtle blink effect, as on the HP 16C, which the developer includes to add realism to the experience.

Windowing functions

The description says the app fully implements the HP 16C's windowing functions, which support more complex calculations. These functions can be turned off if a user would rather see longer numbers on the display at one time, so the display behavior can be adjusted to suit the task.

Source code and advertising

The full source code is published on GitHub, which gives programmers the option to examine the project and contribute to its development. The description also says the app has no advertisements and describes the project as a hobby effort. Those points come from the developer's own description and have not been independently verified here.