This is a fun timing challenge app that supports single and double modes. In single mode, the user needs to stop the timing within 5 seconds as accurately as possible; in double mode, the screen is divided into two parts, and both parties independently time and compete at the same time to see who is closer to the target time. The app provides a clear interface and real-time timing display, supports millisecond accuracy, and automatically compares the results and prompts the winner and loser after the game. Suitable for leisure and reaction training, come and try your time control!