Teamup has 4 subscription levels. The Teamup subscription plans are not based on user accounts, which is always free for anyone. Instead, they are calendar-based.
You can have multiple Teamup calendars, on different subscription plans. The Basic plan is free!
In other words, an upgrade made in a calendar's Settings > Subscription is only applied to the specific calendar which is being upgraded. Our pricing is based on the features available to one master calendar, not one account.
For multiple master calendars to be upgraded to a paid subscription plan, you'd need to upgrade each one separately. See more about what's included in each subscription plan.
Note: There are some circumstances where one master calendar vs. multiple master calendars works best, and sometimes when you need multiple master calendars.