Hopper is primarily a mobile-only platform because its core value—real-time price prediction and alerts—is built for the immediacy of smartphones. By focusing exclusively on mobile, Hopper leverages push notifications to inform users the "exact second" a flight or hotel price reaches its predicted low, encouraging instant "tap-to-book" behavior. The interface is optimized for one-handed gestures and quick, impulsive interactions that are difficult to replicate on a desktop browser. Furthermore, staying mobile-only allows Hopper to offer app-exclusive rates and utilize "fintech" products like Price Freeze and Cancel for Any Reason in a high-conversion environment. In 2026, while many other OTAs maintain websites, Hopper’s data-driven model thrives on the high engagement and personal connectivity that only a dedicated mobile application can provide to price-sensitive travelers.