The FLEX (Flipboard Explorer) SDK 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.
Its primary SDK category is Crash Reporting and Performance and it’s used by iOS apps.
Looking at download trends over the last month, the most popular 
iOS apps that use FLEX are:
Using this information, it appears that FLEX is Not Popular among iOS app developers.
Moreover, over the last 30 days, FLEX has been…
- Installed on 130 iOS apps.
- Deleted from 41 iOS apps.
It's especially popular among iOS apps in the following genres: Social Networking and Business.
SDKs that are similar to FLEX:
- Sentry in the Crash Reporting and Performance category
- Bugfender in the Crash Reporting and Performance category
- Instabug in the Crash Reporting and Performance category
- Reveal in the Crash Reporting and Performance category
- LeakCanary in the Crash Reporting and Performance category
- Bugly in the Crash Reporting and Performance category
- BugSense in the Crash Reporting and Performance category
- Metrics Dropwizard in the Crash Reporting and Performance category
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