Plus42

Name: Plus42
Price: 9.49 USD
Rating: 4.978261 (178 reviews)
Author: Thomas Okken

By: Thomas Okken

HP-42S Compatible RPN Calculator with Large Display and Equations

Features & Capabilities

Plus42 is an advanced scientific programmable calculator, based on Free42. Free42, in turn, is a complete re-implementation of the HP-42S scientific programmable RPN calculator, which was made from 1988 until 1995 by Hewlett-Packard. Free42 is a complete rewrite and contains no HP code whatsoever.

Plus42 builds on Free42 and adds: Algebraic expressions modeled after those used on the HP-27S and HP-17B/19B; attached units and unit conversions modeled after those used on the HP-48/49/50 series; directories for more organized storage of programs and variables; a larger display, with 8 rows and 22 columns (131x64 pixels) by default, which the user may resize at will; time value of money and amortization schedules; and two-dimensional plotting of functions, with ability to zoom and pan, and find integrals and roots from points in the plot.

User Growth & Download Statistics

App

By:

Downloads:

Rating:

Version:

1.3.15 Last updated: 2026-05-04

Version code:

Creation date:

2022-04-27

Publisher country:

Permissions:

android.permission.ACCESS_COARSE_LOCATION Very high risk
android.permission.ACCESS_FINE_LOCATION Very high risk
android.permission.INTERNET Low risk
android.permission.VIBRATE Safe

Size:

9.32MB

Price:

9.49

Email:

th*****@gmail.com

URLs:

Website ,Privacy policy

Full description:

Source:

Google Play Store

Data ingested on:

2026-06-11

Compare stats and ranking:

Ranking

# 839,245 ▲ 5,023

Other rankings

#141 in Tools (Paid) ▲

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Android app. Please use these information below to contact the Android app developer.

Developed by:

Thomas Okken

Google Play Store

https://play.google.com/store/apps/details?id=com.thomasokken.plus42

Email:

th*****@gmail.com

Website:

https://thomasokken.com/plus42/

User Reviews

This is an amazing app that hits the sweet spot between complexity power and portability. The face that is open source and available for all platforms combined with the simplicity of RPN and the quality of the implementation makes it my go to app for most calculations.

Ni*****, 2025-01-24

Where are the booleans with x and y? How can I edit equations as the HP27S? Where is the user manual? Added: I found out my self. It is very very easy to accidentally delete the ppar. I killed the cache and data in app. Now the EQN appears normally.