I have it bound to `$mod+c` and launched as a floating window in i3. It integrates very well into my workflow as I can just quickly launch, perform a one-off calc, and close it whether I'm in a terminal or elsewhere. Since it saves history, I can always relaunch it and continue where I left off as well.
I tried this in cinnamon. But I use multiple desktops and if qalculate is already on another desktop, the experience is pretty bad since it doesn't move to this one (and I do want its 'allow only single process at once' enabled so settings save properly)
I hve a global shortcut to open a Julia REPL session and I use that to perform any sort of quick calculations instead of a GUI calculator. The best thing about this approach is that I can always create new functions for stuff I use often.
Qalc seems like a better calculator to me and is more stable somehow despite being written in I think C++. Not having to download a huge programming language taking up GB of space, research an ecosystem and import ten packages sounds ideal. I prefer python or R and sometimes even BC to Julia for terminal calculating anyways...
I'd let the post about qalculate be about qalculate here.