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.

I really like this app. I’m a diehard HP calculator fan but NOTHING out there comes close to this high degree of precision. Decent range of functions too. Thank you for making this available! Nice work!Some thoughts:1) Might you consider adding Knuth (up arrow) functions?2) Would adding a floating point mode be a possibility? It isn’t always easy to tell if those large integers fall within the specified number of digits of precision.3) Displaying large results in the app itself, in addition to the clipboard paste feature, would be great. Font size could be adjustable for this. A number of text editors I’ve tried choke on pasting 10^6 digits! Again, thanks for your efforts!

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