i41CX

I had the “real” HP41C when I was at Uni 40 years ago. Still today it is the best, especially with RPN. Having this as such a well developed and supported App is an absolute Godsend ! Very well done.

It feels so good to be to use my old HP41C again. Had one in Elec Eng university course and have missed it ever since. Well done to the developer and thanks for keeping it maintained.

I have used this app since it was released. My days studying engineering at Uni introduced me to the ways of RPN when Hewlett Packard first released this iconic scientific/engineering range of calculators. This app reminds me so vividly of the numerous times that the calculator was in my possession and it has been revived for me on my iPhone and iPad. It is a stellar tool that is reliable, aesthetically extremely pleasing and above all else, translates to the Apple platform, exactly what I experienced using the real product made by HP! I note with interest and agree also, that the price for the privilege of enabling a number of significant features is a testament to the developer. To make available wonderful add-ons that fully utilise the most powerful and useful mechanisms available for all users and especially so for engineers and professionals wanting to keep alive this unique style of computing technology in the palm of your hand - all at a reasonable and value-packed pricing structure. Well done!!

Great find. I use it all the time.

Have been using this calculator for a few years and it has been great. Am having problems using it on iPad Air lately with calculator hanging and not accepting key inputs. Limits usability as I can not rely on answers. Please fix

This is a superb reproduction of an HP41CX. I still own the genuine original article, but the convenience of having an exact, full-functional replica on my iPhone and iPad is fantastic. Best of all, you can download all of the plug-in modules that HP originally sold for the calculator, plus a heap of third party modules to give the calculator lots of extra functionality. If there is only one calculator app that you ever purchase for your iPhone/iPad, this should be it.

RPN calculators seem to have fallen seriously out of favour! Against all logic it would seem as really they are a far more efficient way of calculating than on a 'normal' calculator. I can't imagine trying to do complex calculations with multiple nested brackets etc. RPN really is the best method and the 41CX must be one of the best calculators ever made - bar none. Of course you could get a brand name HP RPN calculator.... (but not a HP41 as it turns out) but crikey!!! their prices are outrageous! Get this one before these guys wake up and raise the price! Highly recommended..

This is a great program! The interface is so well designed and uses all of the available screen space so that the numbers are readable for this old timer. In the HP tradition, this app exceeds expectations in both quality and performance.

Well done! $/feature/functionality it’s like buying a hand held super computer. Holy cow! Not to mention throw-back value for boomer generation :)

I have been using HP calculators since I bought a HP45 in about 1973 With HP mostly out of the Scientific RPN calculator area this app fills the need! Makes me miss my HP41CV I had (that died after many years of heavy use). Super customer service as well.