Guest users refer to users that are invited to the guest space.
Guest users can browse information or exchange comments with invitees only within the guest space where they have been invited.

Guest space is a space a person other than Kintone users can join as guests. The space can be used to communicate with members outside the company in collaborative projects.

The guest user is a paid optional service subscription.
To continue using the guest space, you must purchase paid licenses (Guest Account License) equal to the number of guest users.