Calculator X Free - Advanced Scientific Calculator with Formula Display & Notable Tape

I bought the pro version with no ads and I still have ads and no background and nobody to contact to tell them what I think of their app.

But in trying to contact them about bugs they make it so I can't ; I already purchased ad free full and it said I did but the adverts retain and even more comes up when non should , and I already own it .. Why does Apple allow this activity , like there endorsing it .. Now the change background changing doesn't work with no way to contact bug reports to have it fixed ; Apple likely still sells it and refuses to hammer down on this issue of selling apps with no support to bug fixes , it's not like they don't know how to contact the maker as well as still selling the apps .. And I own the full pro version not the free .. ..

Big annoying ads pop up and are hard to close. They make this app pretty useless.

This won't even open!!!!

Best, free little calc I could find. Your can set a custom plain bg (shoot a table top photo or something) for ease of seeing numbers and the paper tape feature (you can see the string of numbers and calcs you're using) is super helpful. You can even email that tape to others. Perfect for lightweight calculations.

Crashed on first use

I tried to use this app, and I thought this app would be nice and friendly, but the app is too buggy. I really hate that because once I turned my phone into sideways, the app closed and kick me out. I tried to tap the app so I need to use it, but it turned black. Now, it restarts my phone and I have to wait 5 minutes for the app to start loading. Please fix that! Also, order of operations is what you need to work on! 5+3*2 does not equal to 16! The answer is 11! Oh, you think that since addition come first in the problem, then you add first? Don't you learn that from school? I guess that you weren't pay attention when the teachers taught you math. Is that true? If no, then why you din't even know order of operations. Now, I am your teacher. You use PEMDAS as your order of operation. This stand for Please Excuse My Dear Aunt Sally. Or Parentheses, Exponent, Multiplication, Division, Addition, and Subtraction. You do parenthesis first. Then exponent. You either do division or multiplication first if they appear first. You do it before addition and subtraction. No matter if addition or subtraction comes before multiplication or division, you always do them BEFORE addition and subtraction. Again no matter if addition and subtraction comes first, you do one of them in the order from left to right. Do you understand me? If no, then piaaaa

Good luck using this "app", huge ads pop up constantly. Try and change the wallpaper and the calculator flips upside down. Useless trash.

Ads pop up constantly over center of screen obscuring buttons. Screen flips upside down afterwards.

Don't get if you hate clicking up on polyp ads when you least expect it. Garbage app