15c Scientific Calculator Free

How can I change the skin of the calculator?

Worked fine then stopped claiming the 'trail' period had expired. Doesn't say it's only a demo and no way to get it back. Pity because it was quite good.

Too-short demo of a terrible app!. AVOID!!! OK, I downloaded and installed this. The buttons are a good size although without any haptic feedback. Unfortunately, they have a terrible blue haze over them which is ugly and difficult to read. Then there's the display - tiny garbage. Also, the 'extra' features result in constant pop-up messages overlapping the keyboard. Ugh! I might have given this two stars as a badly flawed but good-faith attempt at an HP 15c copy, but then it told me that my demo version had expired. Really? LESS THAN THREE HOURS after I installed it, the thing stopped working. If this weren't a demo, it would be terrible. However as a demo it is *reprehensible.* AVOID AT ALL COSTS!!!

That's the really 15C! I am very used to it and to the 12C. All advanced functions and programming are OK. At least, the ones I use as integral, matrix, solve, statistics functions, time conversions and programming my most used functions.

Last time I downloaded a version of this advanced calculator I was using it on a nearly daily basis. When it suddenly stopped working. There is nothing in the description or the permissions stating that this is a demo. If this turns out to be a demo star rating will become 1 star, after one month it will become 5 star. I prefer this style calculator.

I very much like the use of screen space which this app makes, with much bigger buttons and display numbers than the other apps emulating the good old HP 15C. which I bought in 1984 and still in working condition as brand new (unlike its owner!). On the negative side, no feedback when you press the key (vibration and/or flickering)and the image looks a bit washed, much worse look than the other similar apps.

Keeps giving an error msg

I very much like the use of screen space which this app makes, with much bigger buttons and display numbers than the other apps emulating the good old HP 15C. which I bought in 1984 and still in working condition as brand new (unlike its owner!). On the negative side, no feedback when you press the key (vibration and/or flickering)and the image looks a bit washed, much worse look than the other similar apps.

This is not a free version. It is a trial, which would be OK if it gave you more than a minute or two to evaluate it.