What is the crowd's opinion of Calca?

From 3.5 billion comments

If you're familiar with a symbolic calculator that also happens to be a text editor app called Calca, the developer of app has announced that he's working on a version that supports hand written and OCR for the iPad Pro.

I always install Xplorer2, TeraCopy and Revo Unistaller,and Google chrome before anything else. Form Google chrome I use workflowy, Sunrise Calendar and Asana

Then Calca, a text editor with great math integration. I do most of my writing and reporting here and the copy to word if necesary.