Free42

- August 12, 2017

Everyone

( 1,858)

Description

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.

Reviews

4.8

1,858 total

5 1,582

4 187

3 36

2 17

1 36

David Wolff

As a surveyor used HP calculators forever LOVE IT

John Sunderland

I have had a 25, then a 15C - always loved HP calculators. This follows the trend perfectly.

Rui

One word - Fantastic!

Ives Aerts

Had an HP-32s while studying and felt immediately at home.

Bill Boswell

Just like my 41CV. Great app. Thanks

Conrad Cattingen

Fantastic emulator

User reviews

David Wolff August 13, 2017

As a surveyor used HP calculators forever LOVE IT

John Sunderland August 15, 2017

I have had a 25, then a 15C - always loved HP calculators. This follows the trend perfectly.

Rui August 24, 2017

One word - Fantastic!

Ives Aerts September 2, 2017

Had an HP-32s while studying and felt immediately at home.

Bill Boswell August 29, 2017

Just like my 41CV. Great app. Thanks

Conrad Cattingen August 20, 2017

Fantastic emulator

Stephen F. Takach August 12, 2017

I still have my (functioning) HP 42S and have been using it for 25 years. So I am thrilled to have found this app that mimics the original. It operates for the user just as the hardware version. Very pleased.

August 25, 2017

I've been using this app a few years now and I hardly ever have to use my real 42s anymore. Thank you for this amazing 42s app.

Sean Vincent August 13, 2017

The best calculator keeps getting better

July 31, 2017

Works great, but may need an uninstall after update

Thomas Okken August 2, 2017

(deleted)

June 6, 2017

An absolutely outstanding replica of the best STEM calc ever! You won't find an original HP App for this model, since HP knows they simply can't compete with the impressive work done by Thomas. Please, download, enjoy, and donate to keep this project's updates going on! :0)

James Grant May 29, 2017

I have been an HP-4x fan since I was an engineering student in the early 80's. Free42 is an excellent and true emulator that I use on a daily basis. Sadly, my real one sits at home most of the time, now. Great job you guys!

Mike B June 7, 2017

Since my HP15C died, I have relied on Free42 on all my computing devices. A worthy replacement.

Phillip Musumeci June 16, 2017

Excellent reimplementation of what was/is a stand out calculator. I personally liked the 32S but alas its LCD failed, and this is a perfect replacement.

John Clarke May 29, 2017

Its a great app that is always with you when you want to do some quick calcs. I pass it on to as many people as I can. Still have my old HP42 somewhere, but this is better.

Bill Hodges June 14, 2017

I am a professional Surveyor and this is my go to calculator

Craig Maloney May 29, 2017

This is an excellent implementation of a classic calculator. Responsive and clean. Thank you!

Juan Calle August 26, 2017

Excellent simulation, very precise calculations and very fast too.

July 2, 2017

Best RPN programmable. I have this on all my devices.

Mike Bordner June 6, 2017

Great app! Good job

Jacques Winter June 1, 2017

Super

August 15, 2017

Brilliant!

Richard Saunders May 29, 2017

Can't live without it

May 30, 2017

Excellent!

Simon Nelson May 11, 2017

Can you program it for calculations?

Thomas Okken May 11, 2017

Yes. Go to http://thomasokken.com/free42/ (scroll down to the Documentation section) to learn more.

Søren Nilsson May 16, 2017

Must have RPN Calculator

Rubén Iglesias May 31, 2017

Love it! Excellent work. Thanks

Richard Merifield May 6, 2017

Excellent emulator

Marco Trevisani April 26, 2017

The best calculator I found so far.

Duncan Murray April 27, 2017

a great piece of open source android software

April 26, 2017

Love this calculator!

Nicholas Coffey May 1, 2017

transcendental functions don't work neither do exponentials

Thomas Okken May 11, 2017

I'm not aware of any problems with those functions. Where do you think they give incorrect results?

Philip Bogardus April 2, 2017

Really like the app. Love RPN and struggle to use phone calculator. Being an engineer geek RPN is a must to do all the cool stuff engineers do.

Gordon Dyer April 1, 2017

A great app I have used for many years. I have been hoping to see the full precision results for just a long, thank you Thomas!

April 2, 2017

Great app! So used to RPN that I can't use the calculator that came with the phone

Antony Langmann April 1, 2017

Wonderful app. Really useful

Mike Jones April 1, 2017

Just what I needed

James Skaggs March 12, 2017

My favorite calculator app! RPN is the way to go, especially with involved calculations! I still regret trading away my 42s, but this is even better, since it is so handy. I use "Notification Toggle" so I can pull down a notification and get the calculator anytime.

Michael E March 25, 2017

This works great. I am so used to my hp 35S that this makes quick phone calcs on my phone simple. The app icon looks horrible though. With that, graphics are horrible that you would think the app sucks at first glance. But it actually does what I need it to.

Rui S May 1, 2017

Thanks for this app.its well done,reliable, free and very nice to use. Its almost seem it was easy to be done. But sure it wasnt.there must be hundreds of hours of work behind it. So thank again for your dedication.