Is Crackd.SAT College Board approved, and are its questions actually similar to the SAT?

Hey everyone,
I just got Crackd.SAT for SAT prep and wanted to hear from people who have actually used it.
Is Crackd.SAT officially College Board approved/partnered? Also, how similar are the questions on Crackd.SAT to the actual Digital SAT, especially in terms of difficulty and question style?
I’m mainly wondering if practicing on Crackd.SAT will actually prepare me for the types of questions I’ll see on the real SAT, or if the questions are noticeably different.
Would really appreciate any experiences, especially from people who used Crackd.SAT and then took the actual SAT!