Is there a sign-up tool that allows me to limit the number of sign-ups per person?

Yes, TallyCal gives event organizers full control over participant limits both per option and per person. You can set maximum capacities for individual time slots, items, or activities to automatically prevent overbooking as spots fill up in real time. Additionally, organizers can restrict respondents to a single selection or allow them to sign up for multiple options, making group coordination effortless on any device.