Questions.

No. They open the link in their invitation and answer on any phone or computer.

You choose the languages for your guests, and every message is written for each guest in theirs.

Yes, until the deadline you set. After that they can send you a change request.

Yes. Invite your partner during setup and you both see the same plan.

Guests choose their dinner and note allergies. You see the counts and can send them on.

Dietary information is only shared with you and the caterer you name, and guests are told this when they answer.