Absolutely not - no credit card is required for basic. We will only charge you once you decide to use CROOW premium options of Plus or Teams.
Yes! You can upgrade or downgrade your subscription plan from within your account and the plan will update at the end of your subscription term.
Sure, please do! Your colleagues and collaborators can get started on CROOW for free. If you purchase a team plan, you can invite colleagues and collaborators into your team account.