All of the self-service plans (except for Free) can add up to 4 apps and 10 team members for additional fees. 

Extra apps and members are supported on Enterprise plans if you're considering having more than 10 members or more 4 apps. Our business advisors will assist you to ensure your requirements are met. Pricing varies based on the features that you need. Connect with our customer success team here to learn more.
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You can find more details about plans and pricing here.