A9 Timer

A9 Developer Team

About this app

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.

What’s new

• Build interval workouts with Work, Rest, and Round phases.
• Create, save, edit, and reuse custom workouts.
• Review completed sessions in History.
• Improved sound, haptic feedback, accessibility, and stability.