Well, I prefer to use browsers as, well browsers instead of app hosts..., to many tabs, too many distractions, and not that fast )the whole browser, not a given page).

Just using an app that I can open and close anytime is much preferable to me. Currently using speedcrunch for this, but your solution looks a bit more feature full and maybe a good middle-ground between a calculator and just firing up ipython or similar.

All in all a desktop version would be much appreciated, but I understand if it's not a focus for you. For the technical part: what do you think, what would you use in rust to turn this intu a regular gui app?