Hello! Just to clarify a few things:
- “Application editors” on the Pricing page does refer to collaborators that can be added to your application to work with you on it. On the Agency plan, you can have 1 non-Agency member as a collaborator. Agency members do not count towards the application’s collaborator limit.
- In terms of having multiple development versions of your application: you can have up to 20 versions of your app for developing on.
- For how many apps you can have on a plan: all plans [with the exception of the Agency plan] are subscribed to on a per-app basis, meaning you need a plan per application. The Agency plan is the exception: it is account-wide, and any application on your account can be placed on the Agency plan. There is no limit to how many Agency plan applications you can have on your account.
Hope this helps clear the plans up! 