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RPN

Name: RPN
Author: ATH0

ATH0

Reverse Polish Notation Calculator

System & tools
FOSS
Free
No ads
No tracking

Android only

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Simple fixed-point decimal arithmetic, Reverse Polish Notation calculator. RPN calculators may be in the minority but they are easy to learn and very efficient. The idea is that the operator follows the operands, so that instead of typing 2 + 2 =, one types 2 enter 2 enter +. The left arrow either deletes the last digit or drops the last item from the stack.

Developer: ATH0
Source code: github.com/lpar/RPN
Added to AppCosmos: 10 October 2026
License: GPL-3.0-or-later