If you thought Unison.School was only useful from a computer, you need to try it from your iPhone or iPad! In Safari, navigate to https://unison.school, and then click on the "share" button (a square with an upward-pointing arrow). You will see, in the bottom row of options, the choice to "Add to Home Screen".
Double-check the title here, and click the "Add" button. You will now see an icon on your home screen, just like any app!
When you open Unison.School from the home page, it will open in full-screen, without the Safari toolbars!