Do you need a seating solver or a spreadsheet
Four questions: keep-aparts, plus-ones, whole pockets, guest count. Two yeses and a spreadsheet will fight you.
Wedding seating chart app or Excel?
Excel or WeddingWire is enough when nobody must be kept apart and the list is done. Keep-aparts, unnamed plus-ones, and pockets that must stay whole are when you want a solver that reseats.