A9 Timer

A9 Timer is a focused interval training timer for structured work and rest sessions. Create a workout, set work and rest intervals, choose your rounds, and start when you are ready. Built-in presets make it easy to begin, while saved workouts help you return to routines you use often. Features: • Work, rest, and preparation phases with clear visual feedback • Custom workouts with adjustable intervals and rounds • Saved workouts with edit, delete, and quick start • Pause, resume, restart, and completion history • Optional sound and haptic feedback • Dark and light themes with English and Chinese support A9 Timer works offline for core timer features. Optional featured content opens external HTTPS pages in an in-app secure web view. No account is required, and workout data and history are stored locally on your device. A9 Timer is a timer and organization tool, not medical advice or a substitute for professional training guidance.