The FREE plan gives you unlimited creators for 30 days and a chance to see how it works. After that you get 5 creators, and are limited to 5 new stories a month. If you want more diversity of authors you will need to move to a paid plan.
Our 3 paid plans are good starting points for organizations up to 200 employees. They allow for unlimited users, stories, and admins, etc. Larger organizations can request a custom quote.