Plus42

Name: Plus42
Rating: 4.91489 (47 reviews)

Utilities

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Plus42

Utilities

4.9

47 ratings

Age Rating

Seller

Thomas Okken

View in App Store

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User Reviews for Plus42

Amazing reinvented.

I own multiple copies of the HP 42S, the DM42, but unlike those machines, my iPhone is always in my pocket. I have completely uninstalled the default calculator app and use the Free42 application quite heavily. I was really glad to see an upgrade with a bigger screen, so that I have something that’s close to the DM42 in my pocket at all times. This, I tell my students, is the best calculator ever made by man or beast. Thanks, Thomas!

akhan.a, May 04, 2022

The best calculator-computer period

With some programming, this can replace both of my units conversion and finance calculators apps. It is that powerful. I hope - and still have not figured out - we could use and call the TVM variables (PMT, FV, etc) in our custom programs, rather than duplicate the already available functions.

Bprijadi, Nov 21, 2022

Best Programmable Calculator

Have been using Free42 for years but Plus42 is Free42 on steroids. The new features like Dir and Eqn are great enhancements. Many thanks for to this developer for all his efforts.

bquin, May 31, 2022

Beautiful and functional at the same time

Thomas has done an outstanding job on this app! It is not only the most beautiful calculator app out there, but it’s also the most powerful and functional of any of the HP inspired calculator app. The graphics are outstanding and the “extras” that were added in addition to the 42s standard makes the app even more appealing.If you know how to use a RPN calculator, this IS the one to have and use. If you don’t know how to use a RPN calculator, learn how and buy this.I always carry my phone, but rarely my physical DM42 or “real” 42s.You won’t regret getting this app.Congratulations Thomas for all the work you have done over the years relating to the 42. You should be proud.

Chimichanga69, Oct 17, 2023

Lives in my Home Screen

This app goes above and beyond expectations. Very impressive work done to make this calculator what it is. Yes, it’s a bit nostalgic in terms of the looks, but this calculator is super useful! Lots of great loving care went into making this the best modern “HP RPN” calculator on the planet that’s not made by HP, but made by a developer who clearly puts forth passion in his work.

DarkRadon, May 03, 2022

Solid well implemented RPN calculator

This calculator is the one I use first. It's powerfull, excellently done and works allways as expected. Also, it's well maintained. I wish all apps were made with this quality level.

LE2357, Sep 15, 2022

Perfect!!

I use this calculator over all others. It has great precision and is easy to use, yet is powerfull. It is very well made. I couldn't find any bug or design defect. It's a very well thought app.

LE2357, Oct 11, 2023

Thanks for this app

I have been using free42 for long time and I am glad you are offering a premium version and I can contribute to the developer of a great app.

Mist02, May 31, 2022

Great RPN calculator!

The only thing an actual HP42 does better than this is the hardware buttons.If you don’t know what an RPN calculator is, take a few minutes to grasp the concept, give Free42 a try, and math may become a whole lot easier.Just when we thought Free42 couldn’t get any better this shows up. Well done, convenient, beautiful implementation, solid functionality. I use it every day.Thank you so much for these apps Thomas!

Oohrah17, May 03, 2022

Description

Plus42 is an advanced scientific programmable calculator, based on Free42. Free42, in turn, is a complete re-implementation of the HP-42S scientific programmable RPN calculator, which was made from 1988 until 1995 by Hewlett-Packard. Free42 is a complete rewrite and contains no HP code whatsoever.

Plus42 builds on Free42 and adds: Algebraic expressions modeled after those used on the HP-27S and HP-17B/19B; attached units and unit conversions modeled after those used on the HP-48/49/50 series; directories for more organized storage of programs and variables; a larger display, with 8 rows and 22 columns (131x64 pixels) by default, which the user may resize at will; time value of money and amortization schedules; and two-dimensional plotting of functions, with ability to zoom and pan, and find integrals and roots from points in the plot.