Free42 APK

Version 3.0.11 - com.thomasokken.free42

HP-42S Simulator: advanced scientific programmable RPN calculator.

Free42 apk

APP Information

Download Version 3.0.11 (146)
Apk Size7.35 MB
App DeveloperThomas Okken
Malware CheckTRUSTED
Install on Android4.0.x and up
App Packagecom.thomasokken.free42.apk

Download Free42 3.0.11 APK

App Description

Free42 is thomasokken,free42,tools, content rating is Everyone (PEGI-3). This app is rated 5 by 1 users who are using this app. To know more about the company/developer, visit Thomas Okken website who developed it. com.thomasokken.free42.apk apps can be downloaded and installed on Android 4.0.x and higher Android devices. The Latest Version of 3.0.11 Available for download. Download the app using your favorite browser and click Install to install the application. Please note that we provide both basic and pure APK files and faster download speeds than APK Mirror. This app APK has been downloaded 973+ times on store. You can also download com.thomasokken.free42 APK and run it with the popular Android Emulators.

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. 

App ChangeLog

  • Implemented LCLV: CLV for local variables only.
  • RND in ALL mode now rounds like in SCI 11, instead of doing nothing.
  • HEAD, when applied to a string in a numbered register, would corrupt the string if it was 16 characters long before the call. Fixed.
  • Y^X accuracy improvements with integer X.
  • Fixed DUPN 2 in 4STK mode.
  • Added WIDTH and HEIGHT functions, for forward compatibility with Plus42.
  • L4STK didn't pad the stack to 4 levels when used without FUNC. Fixed.

App Screens

Free42 App Screen 1Free42 App Screen 2

Older Versions

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Google Play Reviews

  1. Hamilton Stewart-avatar

    Hamilton Stewart

    If you are looking for a RPN scientific calculator this one is good. It is stable, and easy to use.

  2. Kenneth Chayt-avatar

    Kenneth Chayt

    A labor of love, superbly executed for all to enjoy. Useful as well as historic for all ages with mathematical interests. Well done — thank you.

  3. OldManDan Boulder-avatar

    OldManDan Boulder

    A surreal facsimile of HP's 42 model calculator, which I have used forever. Wore out two, and nearly three before breaking the third one. RPN is unbeatable for complex calculations, chaining too. Only wish is for it to have Tigerfox... for real users like me.

  4. zippy zappa zeppö zorba zoolander-avatar

    zippy zappa zeppö zorba zoolander

    Ive used this app for years. Its the greatest calculator app I have ever used. I love the RPN design of the original HP, the programmability and the memory. I download a new copy every time I get a new device, then load all the programs I wrote for my original HP 42s 30 years ago. It never crashes and no update has ever made it misbehave. This is the only app I can say this about.

  5. Mr Blister-avatar

    Mr Blister

    Great app. Works just like the calculator it emulates. And it's free!!! I would say it is probably the best deal in app store, no ads, no in app purchases, just a great trusty old H&P 42 calculator. Well done developer, thank you

  6. Michael Collins-avatar

    Michael Collins

    The Free42 app turns my Android phone into a convincing full-featured replica of the Hewlett-Packard 42S calculator. My (real) HP42S was a trusted tool during many years of college, plus a decade of professional use. The Free42 app works just like the 42S, and is always there on my phone when I need it.

  7. Brad Belian-avatar

    Brad Belian

    I absolutely love this app. I have always used RPN calculators and this program brings one into your phone. When I start it my phone becomes my loved calculator. Bravo!

  8. R S-avatar

    R S

    This was my favorite calculator and not only do I love that it exists as an app, it also gives me happy memories of being an engineering student.

  9. mawo3961-avatar


    Just like the original. I've been using this calculator for years

  10. Zoober Dad-avatar

    Zoober Dad

    One of the best RPN calculator apps. Recommend.