HIIT Workout Timer by Zafapp is a comprehensive fitness application designed for iPhone users. This app offers an interval timer for HIIT and Tabata workouts, allowing customization of sets, rounds, exercise, rest, warm-up, and cool-down times. Users can set reps and weight for each exercise and benefit from text-to-speech interval change sound prompts. Additionally, the app serves as a workout routine planner with the ability to set workout days, create routines with over 30 exercises, and receive timely reminders.

Moreover, HIIT Workout Timer by Zafapp features a calorie counter, workout history tracker, and detailed analysis of past workouts. It also integrates with Apple Watch, enabling users to start and monitor workouts directly from the watch, including heart rate tracking. Furthermore, users can enjoy background music control with volume adjustment while working out.