iOS/Android Feature Flags

LaunchDarkly Mobile iOS Feature Flag SDK - LaunchDarkly

• An installable feature flag software development kit for iOS apps. This SDK harnesses the LaunchDarkly app and allows you to target users and manage rollouts.  Feature flags are evaluated in microseconds.
• iOS SDK GitHub

LaunchDarkly Android Feature Flag SDK - LaunchDarkly

• An installable feature flag software development kit for Android apps. This SDK harnesses the LaunchDarkly app and allows you to target users and manage rollouts.  Feature flags are evaluated in microseconds.
• Android SDK GitHub

GroundControl for iOS - Matt Thompson

• “Many developers don’t realize that they are allowed to remotely control the behavior of their app (provided that the application isn’t downloading any new code). GroundControl gives you a dead-simple way to remotely configure your app, allowing you to add things like feature flags, impromptu A/B tests, or a simple “message of the day”..”
• GitHub Repo 

Android Flagger - Massimiliano Marcon

• “Flaggr is a library that can be used in Android applications when there is the need for feature flags. Flaggr helps toggling feature flags at runtime.  With Flaggr flags can be specified in a XML resource file and are overridable at runtime when the name starts with _.  Once the library is complete it will also be possible to toggle flags directly from the backend, via GCM or by polling your flags API when the application starts.”
• GitHub Repo 

FeatureKit - Daniel Thrope

• “FeatureKit is a small Swift framework which is to enable application developers to use feature flags. FeatureKit provides a software framework to support the basics on the client side.”
• GitHub Repo 

Toggle - Soham Mondal

• “A library to add Feature-Toggle capability to your android app.”
• GitHub Repo