Better Calculator for Android

You've got to be kidding me--there's no way to get a decimal point, the button is a comma!

It has some unique functions but how do you enter a big expression without parentheses? Not even old MR for reverse polish? :-/

Right now it is little more than a four-function calculator. Thankfully there is also a copy function that allows export of results. But there is no paste function (to allow imports). That would be an easy addition. Memory and/or parentheses functions are also easy additions that would help with complex calculations. And perhaps a pi button? And a factorial button? The latter would be useful for implementing Maclaurin series.

I used to love the app. Used it in astrophysics calculations which required high precision to 50+ whole digits. But, with the earliest of the last two updates, the app quit working on my iPad2, ios 9.3.5. The new interface looks terrific, but the display area remains black. No entries or results appear - just a black area. The developer link and support link for this app are broken. I did try the https address given but after 20 minutes of searching there, I could find no way to report a bug or contact the developer. It is not a website for anyone without a degree in computer science. If the app ever works again for 9.3.5 then I'll give it another 5 stars.