Free42
4.9star
3.13K reviews
100K+
Downloads
Everyone
info
About this app
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.
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.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection
Ratings and reviews
4.9
2.84K reviews
Robert Rohwer
- Flag inappropriate
February 24, 2021
I still have two HP42s, one for my office at work, one for my office at home, both in a drawer. Free42 now resides on my phone and computers. It is a perfect emulation with some significant advantages in stack height and memory. I occasionally miss the HP's programmability, but usually just turn to a spread sheet for highly repetitive calculations or more specialized apps or programs for more challenging work.
13 people found this review helpful
Thomas Okken
February 24, 2021
Free42 is programmable too!
Sylvan dB
- Flag inappropriate
September 1, 2020
For a calculator app that optimizes keystrokes, this is the one. For the classic HP calculator experience in an app, start here. If you want an RPN calculator, you won't find a consistent, faster, smaller, scientific, featured calculator cheaper. If you want graphing or algebraic or textbook entry, keep looking.
15 people found this review helpful
Bret Johnson
- Flag inappropriate
February 11, 2024
I still have an actual 42 and this is a really good facsimile. It's actually better than the real one in that it has better precision (can work with bigger and smaller numbers). If you can handle RPN,the time. a great app. I use it all the time.
4 people found this review helpful
What's new
Now recognizing comment delimiters '@' and ';' for program pasting.
More accurate complex ASIN/ASINH.
More accurate complex ASIN/ASINH.
