What does CalcTan mean?
The first 4 letters (Calc) are the abbreviation of the word calculator and the other 3 letters (Tan) are the abbreviation of the word tangent.
What operating system does CalcTan support?
Is it planned to launch the application for other operating systems besides iOS?
With what operating system of iOS is CalcTan compatible?
iOS 12.0 or later.
How to get a refund ?
The refund is made through Apple this is the URL https://support.apple.com/en-us/ht204084