Most people didn't understand that my goal was not to benchmark all existing calculator apps. It is on purpose that I did not mention all "pretty good" softwares, because I cannot know them all.

The article I wrote wants to mention every point that should be adressed (in my opinion) to make a good calculator. Qalculate, like many others, does address some of them.

But as far as I know, only Chalk addresses all of them.