Free42
Free App
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About 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.
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.
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Android
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2.2+
Android app
App History & Updates
What's Changed
In Export Programs, removed the hard-coded buffer size for the list of programs, so you should now see all your programs in the list, no matter how many there are.
When Pasting complex numbers in a+bi notation, the imaginary unit must now be either i or j; the alternative spellings I and J are no longer recognized.
In Export Programs, removed the hard-coded buffer size for the list of programs, so you should now see all your programs in the list, no matter how many there are.
When Pasting complex numbers in a+bi notation, the imaginary unit must now be either i or j; the alternative spellings I and J are no longer recognized.
Version update Free42 was updated to version 2.0.14
Version update Free42 was updated to version 1.5.12
More downloads Free42 reached 100 000 - 500 000 downloads
Version update Free42 was updated to version 1.5.7
What are users saying about Free42
K
by K####:
by K####:
Perfect version of the calculator
K
by K####:
by K####:
Use this almost daily.
K
by K####:
by K####:
Excellent implementation. I use it every day.
K
by K####:
by K####:
Works very well. Don't use a hand-held calculator anymore.
K
by K####:
by K####:
Thanks for this emulator.
K
by K####:
by K####:
I adore it
V
by V####:
by V####:
This is super faithful!
E
by E####:
by E####:
Super cool. Just like my hp15c but then better.
L
by L####:
by L####:
Fantastic replication of beloved 42s calculator.
N
by N####:
by N####:
Excellent, have this installed on every device I use. LCD contrast on original calc is dreadful, only reason I still use it is because of the physical keys. Haptic feedback on this app has consigned the well worn thing to the box where I keep my old 41c and my Dads 70's HP calcs.
P
by P####:
by P####:
Why does it need precise location among other bizarre privileges? RPN only valid in certain geographies?
J
by J####:
by J####:
Works like my real 42!!
V
by V####:
by V####:
Back in the 80's while at university I worked at a shop which sold HP calculators, so I bought the 11c, 12c, 41CX then the 42S. After many years of faithful service through the 90's and 00's my 42S was stolen. Roll onto the 10's I finally bought a smartphone and discovered Free42. Thank You!!!
H
by H####:
by H####:
A trip back 40 years in time to now have the best calculator I ever had, the HP45.
K
by K####:
by K####:
Very nice app. Now I can use my tablet as a real calculator. Best one I know of.
K
by K####:
by K####:
I have the 42S. With this app, I now always have it with me.
D
by D####:
by D####:
Pure nostalgie
K
by K####:
by K####:
Powerful and a simple to use man machine interface makes this calculator a must have.
K
by K####:
by K####:
Superb. Feels like the real thing. Never fails. Like a real HP calculator.
K
by K####:
by K####:
It's as good as my old HP42
K
by K####:
by K####:
Very well done. A lot of memories.
K
by K####:
by K####:
Simply great
K
by K####:
by K####:
A great addition to my LG G3. I love that the original HP 42S look is an available skin, the only one I use. Print function integration is a major plus. I reported two very minor bugs to the author, both fixed perfectly in a couple of weeks. I never owned a real 42S, but have owned the real 45, 55, 25, 67, 97 and 41C. Love the 42S functionality. Congratulations, Thomas, and keep up the good work!
Z
by Z####:
by Z####:
Best RPN calculator and HP emulator app that I know. I use it almost daily!
E
by E####:
by E####:
Realistic copy of my beloved calculator. Only critique is the ugly icon.
K
by K####:
by K####:
Great implementation of the HP-42. I tell all my engineer friends about it (& the occasional non-engineer).
V
by V####:
by V####:
Excellent! I've been using an HP32S2 for years and love RPN.
K
by K####:
by K####:
Very good RPN calculator. Thank you to the developer.
K
by K####:
by K####:
Very good implementation, congrats.
K
by K####:
by K####:
Very good implementation.
M
by M####:
by M####:
Love it. Memories!
K
by K####:
by K####:
Perfect!
U
by U####:
by U####:
Love it.
K
by K####:
by K####:
I have had a 25, then a 15C - always loved HP calculators. This follows the trend perfectly.
K
by K####:
by K####:
As a surveyor used HP calculators forever LOVE IT
K
by K####:
by K####:
Thank you for the effort in programing this. Left my calculator at work, needed it now. Downloaded from the store. Works as expected. And it's free.
K
by K####:
by K####:
Functional in every way. In this world full of ads, a true freeware is rare, and this is it. Kudos, Thomas Okken. Thanks!
K
by K####:
by K####:
One word - Fantastic!
N
by N####:
by N####:
Had an HP-32s while studying and felt immediately at home.
by K####:
Just like the vintage 1987 version I own.