15C Scientific Calculator

i own three hp15c calculators (including one LE), plus an emulator on each of my computers. This version is great, since my phone is almost always close at hand. The only improvement I would suggest is to soften the edges on the key graphics to make the keyboard more closely replicate the appearance of the real thing. Can't liv e without it. Thanks.

It's a crappy, amateurish knock-off. Serious problems noted years ago - - from the beginning - - are still there! TWO of the keys incorrectly labeled (the 4 and minus keys). MUCH WORSE, the app cannot/does not hold key presses to any of the buttons - - so it's impossible to try view the imaginary result of a computation, or the extra digits of a mantissa, which flash for about 1/10 of a second. The developer seems to have abandoned this app long ago.

I still use my original 15C from back in the day, and love having a virtual 15C on my phone. I use it only for simple math and some trig functions, so I can't say whether the programmability functions properly, but for my mobile purposes it behaves just like the real deal. Great!

Wonderful-- I've only used basic functions but has worked near flawlessly and so nice to use in a format I'm familiar with. Regular calculators don't cut it!

The HP15 was simply the most elegant calculator ever made and still remains so. With the speed of a modern cell phone, it's even more awesome. Great simulation.

I have been using a Hp-15c calculator since they were first available to the public, and it has never failed me. I am a believer in HP. They put Texas Instruments to shame for durability. Some of the original HP selling points were to take an HP and a TI and throw them at a wall, pick them up, and the one that would still work was the Hewlett-Packard: true story from the 1970"s.

a good copy of my 15c. Any plans to keep it current with new versions of the Android OS? My Galaxy S10+ is saying your app may not be compatible... it does work, and I hope it continues to. RPN rocks.

Great virtual 15c! BUT it's screen doesn't display correctly after the recent Samsung android update. Please fix this, and I'm willing to pay reasonably for an updated copy!

I've been using this app for years. Works great, just like the original 15C that I still use. The only downside - nothing beats the feel of the HP calculator keystoke.

Great app. Works well between crashes. For some reason it stops working frequently on my moto Z2.

I really like the RPN format for solving. I used this during my engineering degree, is awesome. Once you master RPN you won't want to go back to regular calculators, it will change the way you do math.

Owned a hpc for years, now it's in my phone. Have been retired for ten years... can't do without it. This is my calculator for all math, once you use Ron it's for life. Super app!

This app is a far second to the paid for version from HP. The HP app ceased functioning in May or June 2019. This works, but it's hard to read with the small font.

Excellent copy of my favorite RPN calculator. I have the 15C that I bought in 1984 - it still works like new & I'll never part with it. Love it!

A faithful reproduction of my favorite HP calculator. The only negative comment, and it is a tiny negative, is the app sometimes shuts down without warning.

This is an outstanding app. If you like RPN calculaters the 15C is one of the best, and I now use this one on my phone more than my real one. Thank you for creating it!

I only wish that there could be the feeling of real keytops. Smooth glass just not as nice. Otherwise great app!

I have used RPN for many years. I wish that more of the f and g functions worked instead of getting error messages.

Great alternative to carrying around my old 15C. Other than a few glitches works like a charm.

Works very well. Should have key click. I really wish it would follow normal rotation protocol.

App works exactly like my calculator. It seems to work fine even though it warns of being for an earlier Android version.

I find myself needing this all the time. I'm an old RPN user and the calculator in win 10 drives me nuts.

I've had my HP15C for nearly 38 years, it was just after that they stopped making great calculaters.

Works great on an Android phone, but no longer works on iPhone since iOS version 13.

I have used a 15C for many years. This app is a near perfect copy of the real thing. I highly recommend it.

Works great. I have a 15c I use at work. I like havjng this on my phone so I always have the calculator I'm used to.

I have an original and love it, got this so I wouldn't have something extra to carry around. It works just like the real one.

I have used the 15c for decades and this app for years. I think this app is just about as close as you can get to the real thing. No complaints.

Mostly works really well, just like my actual 15C. This one occasionally closes for no reason, hence 4 not 5 stars.

Good calculator, but it crashes somewhat frequently.