Flex is a collection of small, useful apps, and a number of them you may run at the same time. Pick your apps, swap them whenever you like, and pay for the plan rather than for each app.Switching an app off frees a slot for another, changes nothing about your bill, and deletes none of its data. Every plan includes HTTPS on your own subdomain, single sign on, nightly backups into your own backup volume, monitoring, and updates handled for you.