Free42

Name: Free42
Rating: 4.8 (281 reviews)
Author: Thomas Okken

By: Thomas Okken

HP-42S Calculator Simulator

Features & Capabilities

Free42 is a faithful open-source re-implementation of the HP-42S calculator and the HP-82240 printer. It runs in Chrome as a simulator without needing an HP ROM image, and the project is released under GPLv2.

All third-party code used in Free42 is public domain or licensed under terms compatible with GPLv2, or used with the authors' permission. The executables and source code are freely available, making the project a portable, community-driven calculator emulator.

User Growth & Download Statistics

App Open Source Education Programming Developer Tools

By:

Thomas Okken

Rating:

4.80

(281) 1 new ratings

Version:

3.3.12 Last updated: 2026-05-05

Version code:

885257947

Creation date:

2009-11-05

Compatible devices:

Size:

8.86MB

URLs:

Website ,Privacy policy

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-06

Compare stats and ranking:

Ranking

# 98,248 ▲ 55

Other platforms

Free42 (v3.3.12)

273,677 4.76

(3,266)

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

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

Developed by:

Thomas Okken

Apple Apps Store

https://apps.apple.com/us/app/free42/id337692629

Website:

https://thomasokken.com/free42/

User Reviews

Big fan from forever ago. Had free42 on all my PalmOS devices, Android, PC, and i0S since my IPhone 1. However, the current version on iOS has the oldest built-in skins instead of the newest ones. Please fix?

by Da*****, 2025-10-27

So nice to have this available. I have always been a diehard HP RPN calculator fan. This app is a faithful and convenient reproduction.

by to*****, 2024-08-29

Not sure why, but the square root function doesn’t seem to be working properly now. Was working okay before. Not sure if other functions are also impacted. Used to love this up until this happened