One of the best calculator applications for scientists and engineers

I am using PCalc from its earlier version, that I chose initially mostly because of the support for RPN. Through all the releases I can see the continuous improvement of the application and great care from the developer to stay on top of iOS releases and improve the application for a scientist or engineer like myself. Also, I personally e-mailed one of my concerns to the developer and obtained immediate support.

igorp about PCalc, v4.3.1