Most tools in your subscription - CRM, Support Tickets, Email & Calendar, Contracts, Jobs, and Workspace - have their own pool of seats. Assigning a teammate to a tool uses one seat from that tool's pool; removing them frees it again. Office is the exception: every active user can use it at no extra seat cost. See Users, Seats, and Roles for how assignment works day to day.
Admins can see seats used and remaining for each tool from the Hub dashboard and from Platform > Users, where every tool gets its own card showing seats used against the total, plus a warning badge once a tool has no seats left. The same counts appear next to each tool's checkbox when inviting someone or assigning an existing user to a tool.
Seats grow the same way your team does: assign a new or existing user to a tool and, if the plan has room, they get a seat. On the Growth plan, seats follow your active user count directly, so there's no separate seat number to set in advance. If a tool shows no seats available, free one up - remove someone from that tool, or deactivate an account you no longer need - before assigning the next person.
Organizations on the Site plan also have a single cap of 50 seats across the whole organization, separate from the per-tool pools above. New invitations are blocked once your active users and pending invitations together reach that cap.
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