15C Scientific Calculator

For $10 it is worth it if RPN is your thing. The only change I can ask for is to make the font on the virtual keys bigger or bolder- they're tough to read especially with the screen brightness anything less than 100%. Great app otherwise! Been using the app now for about two and a half years, and still have no complaints. I would still suggest making the key font a bit bigger though.

Not quite the same as the HP coded one for iPhone:but also not $40 Australian dollars. Well worth the money for people who have used a real calculator - not one of those useless things that has an equals button

Works just like my old 15C. Obviously it's not as durable and doesn't have the tactile keys. But it's the next best thing to having my real HP 15c back. I owned three of them before moving up to the HP 32S and 48 GX.

I've used the 15c since it came out when I was an electronic tech, then as an engineering student, and for more than 20 years as engineer. RPN is always the fastest way to get accurate calculations.

Great app! The ten bucks I spent on this app is insignificant in comparison to the money I spent on the hardcopy. I still carry the original around in my backpack, but the only time it ever sees daylight is when my phone battery is dying. Having the HP15c with me everywhere is priceless. I even have the HP48G installed on my phone, but almost always use this instead.

I have an original from 1986 that i use every day. I have a new limited edition version that i also use every day as i always misplace one. When i can find either i use this. Proper engineers calculator. Steve

Very very good. This calculator is what real engineers use. Just redownloaded it onto my new phone without repaying and without hasstle. I had initially given this app a bad review because I couldn't find the manual. To solve my problems with it, I had to change text size on phone settings which forces thousands of reading glasses searches. Id bet most users of this retro app are over 45 and use reading glasses, and want large text size at browser. But my new phone is bigger so maybe life will be better.

Bought one when they first came out... liked it so much that when someone in my office ripped it off a few years later, bought another one rather than one of the new ones... never went anywhere without for the rest of my 20+years in the aerospace industry

This app appears to not provide correct trigonometric functionality. If you type 45 TAN you get 1.6198. The actual calculator indicates the answer is 1.000. Is an update coming to correct this. At 10 dollars for the pro version versus free for the Demo version. I think I should have kept the free version.

Having lost my 11C a kajillion years ago, I was glad to see this. I'm also glad that it appears to actually work as advertised. I have to believe that the negative comments I've been reading apply to older versions, or different devices than mine (Samsung Galaxy 7.7). I can't find anything wrong. And everyone who knows me complains about how good I am at finding things wrong! (The real HP-15C doesn't have "online manuals." There's no reason for a simulation of it to have them. Yeah, having to take the tablet out of the keyboard dock so I can use it in "landscape mode" might not be convenient but that's the nature of the 15C and that family of HP calculators.) Well, it turns out to not be so stable ever since Google forced Android 7 on me.

This is the closest thing to the unbeatable 15C. It works as advertised, seems rock solid and totally reliable. I will run this app on anything that will support it. If you appreciated the original, you'll love this emulator.

Except maybe for the great HP keyboard and the many months of battery life. But can't blame the app there!

It works well and I use it all the time. The only problem I have with it is that it is too slow. I can type numbers in faster than it reacts

Very nice to have my 15c with me everywhere I go! Response times to key presses a bit slow though on my S4 mini

Excellent! The only issue I have is that sometimes, the software hangs for no reason in my Samsung GLAXY Note.

So far so good. I'll edit this thus if I have problems.

I used this calculator all through college and this app is the real thing. Works great!

Love it

Almost like the original! Better get a 5-inch or larger display as the touch input is tricky with ordinary, palm-sized Androids.

Works very much like my old 15C did with one exception. I have been unable to set my display to a default of just 2 decimal points. I will use fix 2 and all is fine until I shut the app off; at which time it reverts back to the 4 decimal point default. Perhaps someone who knows how can pass it along to me.

The audible click for key strokes stopped working a long time ago and response to keys is slow. But replication of the famous HP RPG format is perfect.

Works just like my old 15C. Obviously it's not as durable and doesn't have the tactile keys. But it's the next best thing to having my real HP 15c back. I owned three of them before moving up to the HP 32S and 48 GX.

Great app. Programmable, faster than the original. I love it. I hate algebraic calculators, always lose numbers and want to throw them away. It very useful for me. I am a land surveyor. I use it every day.

The best 15C emulator I've have seen and used. Once you have tried RPN for real you're hooked for life!.. ☺ The only thing I miss is the tactile feedback my trusty old (30+ years) HP 15C gives me... ☺

My only comment is that I wish they would utilize the available screen space better. While keeping the geometry of the original is nice, there is plenty of space to make the keys larger by tweaking the proportions a little. It shouldn't alter the look very much.

I am a land surveyor /engineer and have used BP calculators for years. I love this calculator even more than the actually HP.

Functionality is great, just like the real one I lost years ago. I could wish the display looked more like the real thing. I'm running it on a Samsung Galaxy S4, for what that's worth.

Great app if you are used to the original. Also have it on my tablet and the size is bigger.

Same as my faithful RPN calculator but on my phone, so always with me.

Awesome app. Love it. best 15c out there. Needs a selectable audible click on button press. Prefer that to haptic feedback.

Very very good. This calculator is what real engineers use. Just redownloaded it onto my new phone without repaying and without hasstle. I had initially given this app a bad review because I couldn't find the manual. To solve my problems with it, I had to change text size on phone settings which forces thousands of reading glasses searches. Id bet most users of this retro app are over 45 and use reading glasses, and want large text size at browser. But my new phone is bigger so maybe life will be better.

It's with me whenever I have my phone and was much, much cheaper. The only thing I would change is to have a portrait setting.

The HP15c app has the same functionality as the calculator that was my workhorse during my electrical engineering and postgraduate school. It's the perfect quick tool for calculations.

It works just like the real calculator. If I were to suggest an improvement, I would like the ability to turn off the sound, I've. Silence the button clicks.

I still use my HP15C, but when I don't have it on me this app is darn near like the real thing. The main difference is that there are no real buttons to push, but the haptic feedback is helpful in that regard. In addition, the size of the calculator display on my S4 is almost exactly the same size as the actual calculator.

This is the closest thing to the unbeatable 15C. It works as advertised, seems rock solid and totally reliable. I will run this app on anything that will support it. If you appreciated the original, you'll love this emulator.

It behaves almost exactly like my trusty HP 15C - the finest calculator ever built. Highly recommended.

I use it constantly at work as a civil engineering designer. It is very good.

Works great if you are a 15C fan this is for you.

As an owner of the original HP 15C, this App is close enough. However, the aspect ratio is little bit peculiar. No feeling for using the keys. Either some sound or vibrations may be helpful. I like it because it is free. I had the original software HP 15C for free before!