Plus42

Plus42 is a sophisticated and fully-featured calculator application that consolidates the capabilities of multiple specialized devices into one compact package. Inspired by the Free42 project, it faithfully emulates the legendary HP-42S programmable RPN calculator, which was produced until the late 1990s. This software delivers a complete suite of advanced mathematical, scientific, and programming tools through the efficient and logical Reverse Polish Notation (RPN) entry system. It offers precision, versatility, and a familiar interface for engineers, students, and professionals who demand powerful calculation tools in a streamlined, modern digital form.