Hi @MyOrnament,
Happy to jump in here!
So your contact are the same as active profiles. You will not have a different number of contacts vs active users. However, you can have hypothetically more ‘active users’ in your account vs subscribers in a certain list in your Klaviyo account as users might have purchased from your site, but not opted into receive marketing from you and be added to a list.
As @retention mentioned earlier, you will pick a plan based on the active emails in your account. We base our account plans on the number of active profiles in your account and the amount you can send, which is about 10 times the maximum number of profiles in your plan.
For more information on email plans in Klaviyo, check out these additional documentation resources on our Help Center!
Thanks for participating in the Community!
-Taylor