As you probably already know, Cydia is a powerful software manager for iOS that allows iPhone and iPad users, provided that they have a jailbreak, install on their mobile devices applications that aren't in the App Store or modifications of applications that haven't been authorized by their developers. On Android it's much easier to make use of apps from non-official stores, therefore, the exact equivalent on Google's operating system doesn't make too much sense.
Bring the iOS environment to Android
For such purpose, this Cydia for Android, which mustn't be confused with Cydia Substrate (the platform that used to allow us to carry out modifications on our apps), doesn't have exactly the same functions as the iPhone version as we don't have to go through too much trouble to find mods and unofficial apps.
App store with themes perfectly sorted into categories and loads of games.
In this case, we're basically talking about a marketplace from where we can download apps and games that we won't find on Google Play, the reason for which the APK of this program has also been removed from the Play Store. Furthermore, it allows us to download themes to give our Android the aspect of the iOS graphical interface. In other words, it intends to bring the whole environment of Apple's operating system to our Android device.