Wheel of Names

Yes, and in the way that matters: the winner is chosen before the wheel moves, using the browser's cryptographic random source, and the animation is aimed at that segment afterwards. A wheel that spins first and reads off wherever it stops is at the mercy of its own easing curve and frame rate, which is a strange thing to trust with who presents first.

Hundreds. The labels shrink as the wheel fills up and stop being readable somewhere past about sixty, so beyond that the winner is announced underneath rather than read off the wheel — but the draw itself is unaffected by how many are on it.

Yes — there is a button for it, which is what you want for drawing second and third place, or for going round a class without asking the same person twice. Leaving them in is the default, because for most draws each spin is meant to be independent.

They both stay. Two people called Sam is an ordinary thing, and silently merging the lines would quietly halve one person's chance of winning — which is exactly the sort of unfairness nobody in the room would notice.

No. The list never leaves the page — there is no account and nothing stored, which matters more than it sounds for a class register or a list of giveaway entrants. Close the tab and it is gone, so keep your own copy of anything you want back.

The same draw, a different presentation. The random picker gives you a name instantly and is what you want when you are on your own; the wheel is for when there is a room watching, where the spin is most of the point. Both use the same cryptographic source underneath.