Nook Calendar is a completely free calendar app, with no credit card required to get started. We believe that everyone should have the ability to coordinate their time in the office with their peers in an unlimited way. With Nook Calendar, you’ll be able to add as many users into your workspace as you’d like - no hidden charges. In the near future, we will be offering advanced premium features related to office management and insights for those who need more from Nook. Our team will keep you updated as those features become available.