The first thing I do when I install EOS is uninstall Gcalculator and install gnome-calculator (if i forgot to un-check it in live installer in the first place). In my opinion it’s the best there is. I like it has history and allows writing multiple operations in one go. If you click on a line in history it brings back those numbers so you can work with them. It’s a real productivity improving tool. I’m missing most of its features when working on my phone.
Also it looks dumb enough for me while still looking pretty good.
