Pro and Agency plans include team seats. Adding a member above the included seats prorates the extra seat to your next invoice.
Each plan includes a fixed number of team seats (Pro: 5, Agency: 15). Adding a member above the limit prorates the extra seat on your next invoice. Removed members free the seat immediately.
Settings → Billing → Seats.
See Settings → Billing → Seats for current per-seat pricing.
No — client-view is free and unlimited.