If you've ever used a jailbreak for your iPhone or iPad, then you probably know Cydia, and on February 28, 2008, the first version of it was released Since then, there has also been a merger of two alternative app shops. "Rock" was released in Cydia in September 2010.
Official Update for iOS 11 is pending
There is currently no official update for Cydia to make the app compatible with iOS 11. Fans are still waiting for an update by Jay Freeman.
However, there is a working variant in Electra jailbreaking. However, this is a "fork" of CoolStar, which does not come from Freeman itself.