About waking at 8:30 AM
Half eight suits a later shift or a first lecture at ten. It is also the most common weekend alarm — late enough to feel like a lie-in, early enough not to lose the morning entirely.
Leave the tab open
A browser alarm can only ring while its page is open. It does not have to be the tab you are looking at, and on a desktop it does not have to be the window in front — but closing the tab or quitting the browser stops it. For anything you genuinely cannot miss, set a second alarm on your phone as a backup. That is true of every browser-based alarm clock, not just this one.