i41CX

i41CX is the same powerful advanced programmable RPN scientific calculator as the highly acclaimed i41CX+ but without the latter’s incredibly advanced capabilities such as the printer, expansion, CAS, etc. It is functionally equivalent to the world-renowned HP-41CX and inherits all of the i41CX+ usability features including extremely responsive and animated key clicks, audible key feedback sounds, optimally spaced keys for accurate input, traditional and upbeat modern diverse set of skins, etc.

Category	Price	Seller	Device
Productivity	$7.99	Antonio Lagana	iPhone, iPad, iPod

If you are looking for a powerful programmable RPN scientific calculator but don’t need all of the capabilities of i41CX+ then i41CX is for you. And best of all, if you ever decide that you need the more advanced capabilities of i41CX+ you can enable them using secure in-app purchases right within the app!

FEATURES:
• RPN logic with a 4 element deep memory stack
• 319 main and 124 extended memory registers
• Over 300 built-in functions, including nearly 100 functions created specifically for i41CX
• Time, calendar, alarm, and stopwatch functions
• Rich set of functions and algorithms: numerical, mathematical, statistical, and much more
• Access to the entire HP-41 library of solutions for science, mathematics, statistics, engineering, business, financial, surveying, medicine, real estate, and many other domains
• Programmable - Over 2000 lines
• User definable keyboard
• Ability to operate the calculator using a Bluetooth keyboard
• Device integration: external display mirroring, copy and paste, GPS, accelerometer, digital compass, time and date synchronization, and much more
• iOS 8 Notification Center widget
• Sound support including synthetic tones and interface sounds
• Support for calculator skins and optional mini stack display
• Adjustable sound volume and display colors
• Usage & Examples table with usage tips and examples
• Quick reference guide of all built-in functions
• Beautiful and clean user interface

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A comprehensive FAQ is available at http://alsoftiphone.com/i41CX. Please don't hesitate to use the "Contact Us" link there if you cannot find the answers or information that you seek. Thank you.

Reviews

Latest Update Caused Problems - Now Fixed!
cb_cb1

UPDATE - The display issue from v7.6.1 is fixed - via 7.6.2. The calc is now back to the great tool that it has been for quite a while and I look forward to continuing to use it for another few years. Thanks. PRIOR - The most recent update may have made for compatibility with the latest iOS (I haven't tried it yet on my iPhone and likely won't based on this experience) but it no longer works on my iPad that has an older iOS. The background graphics no longer scale up to the screen size so the touch points for the calc do not agree with the visual indications for the buttons. Avoid this version. Wait until it is fixed if you have an iPad with an older iOS.

The REAL thing...
First Review My Files Free

Latest speed enhancement is phenomenal! Thank you. Now if we can have it always “ON” when it comes up, then it would be perfect! Is there a setting that would have turn on automatically when it starts?

Mazel Tov!
Weyland-Yutani

I wore out my HP-41 calculator but it was the thing that brought me back to programming after a nauseating experience with FORTRAN 77 in 1981. I wrote nearly 200 programs on that calculator. It got me through engineering school, taking the PE, working on the Hubble, B2, and 7x7s. I’m glad to have it back, even just as a calculator. I’m curious: Can I still write a subroutine to cause the calculator to automatically shut down when I turn it on using flag 11?

The Best RPN Calculator.
DRGWMaine

For all the reasons HP RPN scientific calculators are used for engineering, this calculator is simply the best. All the features of the best HP calculators, with improvements. Outstanding.

LOVE IT and no buying N size batteries
Big Screen us BA

Love it love the way the case looks 35 years using one now have it on me

Love it!
Nick D. Name

I LOVE the way it reproduces the look as well as the action of the calculator. It just wouldn’t be the same without emulating the case, the ports everything. That is for this final but critical extra touch.

Awesome!
Mennonite Guy

I used an HP-41c for years in engineering. This now is far more convenient and true to the original. Developer is also very responsive.

No longer works
Gunnerbeast

This app no longer works. It needs to be updated. Too bad because this was my favorite calculator.

Functional but terrible skeuomorphic design
GAPas

It does seem functional but I hate the way it wastes screen space to try to look like the physical version of the calculator including, ridiculously, the case and ports on the top. So, the keys are small. Key feedback is subtle and is not good. I have Calc41cx and like it a lot better, but it hasn't been updated for iOS 11 and is no longer in the App Store. There's another free alternative: my41cx-ios, but it has its problems. The interface doesn't waste space with skeuomorphism, but the interface is low contrast and it has literally no key feedback. What to do?