Even for free reservations Resy asks for your credit card to "protect the restaurant from fraud". No other reservation service does this so I dont beleive them. I think Resy wants your credit card in case you accidentally make a reservation that does cost something. Reservations can not be changed online and are difficult to change on the app. To add more people I had to cancel my reservation and rebook it. Reservations do not link to your calendar. I will never use Resy again.
DianeFE about Resy