Plus42 App Reviews

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.

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!

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!

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.

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.

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.

When using on iPad, the app occupies the whole screen. Currently it does not support multitasking. But it would great to share the screen with other apps (side or floating window).

I tried several calculators apps and in my opinion this one is the best by far. It has much more than I need and yet it is easy to use and intuitive. This is the one I use most.

Can’t believe how happy this app makes me, to once again have my favorite calculator in hand. The HP-42S was unmatched and this app replicates it perfectly. Simply amazing. Thank you!

The 42s was, in my opinion, the most elegant calculator ever devised during the golden age of HP engineering. This simulator perfectly recreates this legendary calculator and it adds some additional great features. It has several enhancements seen in the RPL calculators without introducing the shortcomings of the more complex interface. Put another way, this calculator is what HP should have done with the 48 line. I believe that Plus42 now deserves the crown of the best calculator. It is the p

I’ve really like this calculator however lately there seems to be an issue with programming. I had a program for the sulfur to convert Celsius to Fahrenheit and vice versa but for some reason it doesn’t work anymore so 212 Fahrenheit should be 100 Celsius. it comes up with something like minus one point something to the power of 6000 I wonder what the issue is?

Once you use an RPN calculator, you will never go back. The HP-42S beats the HP Prime in layout and ease of use for most task, and the enhancements in this implementation is great. I love having the (enhanced) HP-42S always with me on my iPhone whenever I need a calculator.