Injecting FLEX with MobileSubstrate. Inject FLEX library into 3rd party apps.
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FLEX @ c766e5d

FLEX injected

Injecting FLEX into 3rd party apps with MobileSubstrate

FLEX (Flipboard Explorer - is a set of in-app debugging and exploration tools for iOS development. FLEX is primarily intended to be a tool used in your own apps. Want to learn how other apps are built? Just inject FLEX library into 3rd party apps and explore.

Requires a jailbroken iOS device.


Most users should download the pre-compiled Debian package available under Releases.


FLEX_injected was tested on iOS 9.0.3, but it should work on other iOS versions too. A jailbroken device is required. Using Cydia make sure the following packages are installed:

  • dpkg
  • MobileSubstrate
  • PreferenceLoader

How to install

Most users should first download the latest pre-compiled Debian package available in the release section of the project page at:

The tool was tested on iOS9 running on an iPhone 6.

Download and copy the Debian package to the device; install it:

dpkg -i com.daapps.FLEXInjected_0.0.1-1-7_iphoneos-arm.deb

Respring the device:

killall -HUP SpringBoard

There should be a new menu in the device's Settings where you can enable the extension:


Finally, choose and app that you want to inspect, kill and restart the App you want to inspect:

Settings flex App

Calculator inside flex App

How to uninstall

dpkg -r com.daapps.FLEXInjected


Most users should just download and install the Debian package. The build requires the Theos suite to be installed; see . You first have to create a symlink to your theos installation:

ln -s /opt/theos/ theos

Make sure dpkg is installed. If you have Homebrew, use:

brew install dpkg

Then, the package can be built using:

make package