Free42

4 likes

Free42 is a re-implementation of the HP-42S calculator and the HP-82240 printer.

Free42 screenshot 1

Free42 screenshot 2

Cost / License

Free
Open Source (GPL-2.0)

Application type

Calculator

Origin

United States

Platforms

Mac
Windows
Linux
Android
iPhone

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Tags

programming

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eslam900999 liked Free42
2 months ago

Free42 information

Developed by
Thomas Okken
Licensing
Open Source (GPL-2.0) and Free product.
Written in
C++
Alternatives
7 alternatives listed
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Supported Languages
- English

AlternativeTo Categories

Development, Education & Reference

Apple AppStore

Updated May 5, 2026
4.77 avg rating

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Our users have written 1 comments and reviews about Free42, and it has gotten 4 likes

Free42 was added to AlternativeTo by loucypher on Sep 2, 2012 and this page was last updated May 11, 2022.

Comments and Reviews

luma

★★★★★

Feb 24, 2018

0

Simply fast and immediate as the original! You have to like RPN, that said it's a perfect everyday's tool. I normally associate it to a fast launch key from desktop, both on WIndows and Linux

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What is Free42?

Free42 is a re-implementation of the HP-42S calculator and the HP-82240 printer.

It is a complete rewrite, not using any HP code, and it does not require an HP-42S ROM image.

Free42 is an Open Source project. The executables and source code are released under the terms of the GNU General Public License, version 2.

All third-party code used in Free42 is either in the public domain, or licensed under terms compatible with GPLv2, or used with the authors' permission.