Typically, we’re checking to see if a user is logged in before we show them some sensitive information we’d only want logged in users to see. For security reasons we do not recommend checking if a user is logged in using code within an app (code within an app can be overridden if a user was really determined to gain access to sensitive information). Instead we provide security rules that can be set within Fliplet Studio.
These rules only allow access to certain screens if a user is logged in. To find more information on how to set these rules please see this link.