That's EXACTLY what I always have a scratch sheet open for and sometimes I don't want something as full featured as a Google spreadsheet. I want to just open up

That's EXACTLY what I always have a scratch sheet open for and sometimes I don't want something as full featured as a Google spreadsheet. I want to just open up this app and it'll be a full screen spreadsheet with no distractions and a URL that I can share just like notepad.cc. It doesn't need to do advanced calcs, just simple arithmetic would be enough and the ability do a simple password protect and share the link.