i41CX+ — RPN Calculator with Printer and CAS

This is one of my most used programs. I grew up with RPN and can’t really use anything else efficiently. Thank you!

So, I’m a consulting biostatistician. I learned RPN several years ago and stuck with it. This is an incredible emulator for an RPN calculator. I have to say I use this app more than any other on my phone. The only negative was it took an insufferable amount of time to load the app. This latest upgrade finally solved this problem. THANK YOU, DEVELOPERS for finally fixing this. A+ app. Can’t say enough good things about it now.

Amazing! The best calculator in history fully replicated for the iPhone. I bought it when it was first introduced and it has been used daily ever since! The author has kept it current and support is great!

Mr. Lagana, it seems as I have both i41CX &amp;.i41CX+ and when USER is on and I tap no. 4 I get all 000000 on screen, when off 4 is ok.<br/>Please investigate.<br/><br/>Jacob Paul Gable Thank You

As a longtime user and fan, I have to applaud the design, implementation and continuing support and maintenance of this app. I cannot work without this RPN calculator.

In 1979, I purchased my “41-C”. It was love at first tap. I was a real estate appraiser and moved into IT. I never found there was any calculator activity that I couldn’t do more easily on the 41. I have owned MANY programmables of both HP and TI. I always cherished the 41 most. After owning the Android version of the 41C on the Galaxy S4, when I recently upgraded to an IPhone, I quickly sought to replace the Android version with the IOS version. <br/>I saw the other “simpler” and cheaper versions of 41C’s then noticed this version.. <br/>Even at $25, this AP IS worth the difference. This version includes simulation of a FULLY loaded HP 41C (ALL HP and other modules, with virtual printer emulation). What’s more.. the author integrated device from the I-device( e.g. accelerometer, GPS, real time clock etc.). Other than not likely permitted on scholastic tests (CLEP, ACT, etc), I would think this would be a great student calculator. <br/>Of course I love the RPN logic...

The overlays do not scale correctly. Overlays are about 75% the size they need to be.

This guy has kept up w years of iOS updates and continues to improve a great product. I use it more than the phone app. The last improvement on startup time is much appreciated.