Overlap: World Clock represents a specialized approach to time zone management, distinguishing itself from conventional world clock applications through its visual scheduling interface. Developed by Bonobo for iOS, the app addresses the complex challenge of coordinating across time zones without manual calculations, positioning itself as a tool for professionals and international communicators. The core functionality centers on the Overlap Graph, which visually displays overlapping available hours across selected time zones. Users can set custom availability windows for each location, with the system automatically calculating and highlighting compatible time slots. The interface maintains multiple time zones simultaneously, with clear visual indicators for current time and day/night cycles. Additional features include location-based time zone detection, customizable color coding for different regions, and the ability to save frequently used time zone groups. User experience demonstrates thoughtful design with a clean, minimalist interface that prioritizes readability. The graph-based visualization proves particularly effective for quickly identifying viable meeting windows, reducing cognitive load compared to mental time calculations. Real-world usage patterns show the app being utilized for scheduling international business meetings, coordinating with remote team members, and planning communications with friends and family abroad. The interface responds smoothly to adjustments, with instant visual feedback when modifying availability parameters. With a 4.8/5 rating but no specific user reviews available, the app appears well-received though detailed feedback patterns cannot be analyzed. The high rating suggests users find value in the visual approach to time zone coordination, though absence of detailed reviews limits deeper insight into specific user experiences or recurring issues. The application excels in its specialized visual approach to time zone coordination, particularly for users regularly scheduling across multiple regions. Limitations include iOS exclusivity and the niche nature of the functionality, which may not appeal to users needing basic time zone reference without scheduling features. Ideal use cases involve frequent international collaboration, remote team management, and situations requiring repeated coordination across consistent time zone groupings.