Extensify

Extensify lets you tweak third-party iOS applications without jailbreaking your device.

Extensify lets you tweak third-party iOS applications without jailbreaking your device. Apps that have been modified with tweaks —called Exos in Extensify language— contain a ‘+’ sign after them for easy identification. So, for instance, if you modify YouTube with the Cercube Exo, a new version of YouTube will be deployed to your Homescreen called YouTube+. It’s totally possible to have two of the same apps installed at once—one stock and one ‘+’ version. Of course, you aren’t forced to keep the stock app, but it is a nice side benefit to be able to run two versions of the same app.