Global Entry is a Customs and Border Protection (CBP) “Trusted Traveler” program that provides expedited customs screenings for "pre-approved, low risk" travelers entering the US after traveling abroad. This process requires a background check, fee, and interview.
CLEAR Pass for CBP Mobile Passport is a FREE app authorized by CBP that does not require a background check or interview. The app allows you to upload your passport and complete Customs and Border Protection questions on your phone rather than the traditional paper forms. Note: you cannot use both Global Entry and CLEAR Pass together for a particular trip.