Split your class into random groups of balanced size, and set conditions so two students are never grouped together. Only students marked present are grouped.
Yes. Add them as a “keep apart” pair. Every shuffle respects it, and if the rules can't all be met with that many groups, WhirlPicker says which pair is the problem and offers a fix.
Group sizes never differ by more than one. A class of 27 in four groups gives 7, 7, 7 and 6.
Yes. Mark who's away today and they're left out of the groups, then included again tomorrow.
Yes. There are no ads, no accounts and nothing to install, and names never leave your device.