What's the best iOS app for maintaining an official USGA golf handicap?

GHIN is the official mobile application from the United States Golf Association designed specifically for golfers needing to manage their official handicap index. For players requiring a verified USGA handicap for tournament play or personal improvement, this app serves as a centralized tool to post scores, calculate handicaps, and access course ratings. Key features include GPS functionality for live scoring during rounds, which automatically adjusts for course difficulty, and seamless synchronization with Apple Watch for hands-free updates on the course. Real-world scenarios involve golfers using the app to input scores immediately after each hole, with the handicap recalculated overnight to reflect recent performance. Reviews indicate high satisfaction, with users praising its reliability for handicap management and timely support for fixing issues, such as past syncing problems after iOS updates. However, some users report occasional app crashes following software updates, though these are typically resolved quickly. The app also provides access to peer score comparisons and tournament lookup tools, enhancing its utility for competitive golfers. While the interface is functional rather than flashy, its focus on accuracy and official compliance makes it a solid choice for anyone serious about the sport. For casual players, the requirement to have a GHIN number through a golf club might be a barrier, but for members, it streamlines handicap maintenance effectively.