HP 15C Calculator

We need an iOS compatible upgrades from HP soon!! I've used HP calculators most of my life, since my first HP67 in 1980. I still have it. I have many others: 34C, 11C, 12C, 15C, 41CV, 48GX. No other calculator type, has ever surpassed the HP family. EVER. I prefer to use the real ones only occasionally now, because there are no more replacement parts. However, The emulators for the iPhone are so nice to have and I use them regularly, and they're all in my pocket on the iPhone 6s+. Phone size is about the actual size of the real machines too. I love em. HP needs to update the 12 and 15 soon though. Apple says they are not compatible with future versions of iOS. Other developers are keeping up with their HP emulators, some of which are very nice. I think HP would have a profitable business unit if they took seriously bringing these great little computing machines back to life in the whole family of reasonably priced emulators. However, for now, is be grateful if they would just ensure their existing emulators are compatible with future iOS versions. Kindest Regards,

This is a superb emulation of the original Hewlett-Packard HP 15C calculator. I should know. I had an HP 15C when it was new. It took me through physics and calculus in college and the start of my engineering career. Regretfully a trip though the washer and dryer in the pocket of a jacket killed that calculator. I have bought and used other calculators but the 15C has always remained my favorite. When I saw this app, and it was made by Hewlett-Packard, I did not hesitate to purchase it. Reports the the app does not work with the latest iOS are out of date. Hewlett-Packard updated the app and it works flawlessly. As of this review I am using iOS 12.1.4.

I put the date I purchased it here since I know there must be a lot of versions. I have tried every RPN calculator out there. I like this one the best. The horizontal is a perfect rendition of the classic calculator. In Vertical the choices were made perfectly. A reciprocal key and a square root key are the only functions. Both of these are handy for quick calculations I make in vertical mode. Also the keyboard area is not cluttered with ads or even settings. To change the FIX for digits you must go horizontal. The elegance and simplicity are ideal.

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This is a horrible mess. I am stunned that HP, a company long known for quality hardware, would let this appear on the App Store. When subroutines finish executing the contents of the x register flash endlessly on the display. The only way to make it stop is to press some key which of course changes the contents of the x register and pops the stack! For a while, pressing the function key f then prefix would lock up the calculator, displaying the mantissa, instead of timing out after one second and returning to a normal display. Now it’s ok. So that’s going to be an intermittent bug. But come on, people. Just fix the flashing subroutine result problem. Where do I go to get my $15 back?. Retro 15C works just fine and it’s free.

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Update: It's been almost two years since this app was last updated. It still doesn't make use of the larger iPhone 5 screen. The bug that causes the display to flash after running a program or using the combinations/permutations functions still hasn't been fixed. And, there's still no way to control the key click volume independently. It's a shame that HP seems to have abandoned this app... -- It's great to have an authentic HP 15C on my iPhone. I've been a fan of HP's RPN calculators for years, starting with the trusty HP 25 that got me through college. The built-in manual and alternate portrait layout are nice additions. One bug: After using either the combinations (Cy,x) or permutations (Py,x) statistical functions, the display flashes continuously until some other key is pressed (on my iPhone 4S running iOS 5.1, anyway). Also, as others have noted, the key click sound is annoying to the point where I've muted it entirely. It would be nice to have a choice of sounds or the ability to control the volume separately.