FLEX (Flipboard Explorer) is a set of in-app debugging and exploration tools for iOS development. When presented, FLEX shows a toolbar that lives in a window above your application. From this toolbar, you can view and modify nearly every piece of state in your running application.
FLEX is a tool in the Mobile Runtime Inspector category of a tech stack.
FLEX is an open source tool with 10.3K Github Stars and 1.17K Github Forks. Here’s a link to FLEX's open source repository on Github
Here’s a list of reasons why companies and developers use FLEX.