The Guestbook Extension mobile app allows you to earn both Cash Back & hotel loyalty points when you book hotels from using your mobile phone. This combination of benefits is not available in any other mobile app or can’t be accessed if you book hotels from your mobile browser alone! The Guestbook Extension’s mobile app currently supports Marriott & Hilton chains. Support for Choice Hotels, Best Western, IHG, Wyndham, Hyatt & more is coming soon!