Interval Timer □ HIIT Timer

What it does

Interval Timer is a highly customizable tool for users who practice high-intensity interval training (HIIT), Tabata, or other timed fitness routines. The app allows for precise control over work periods, rest times, rounds, and the number of exercises. Users can name their exercises for a guided experience and save their custom workouts for repeated use, effectively turning a simple timer into a lightweight workout planner.

Where it shines

The app's strength lies in its focused, no-nonsense approach. It drops the user directly into the timer setup screen (00:01), eliminating any friction to getting started. The workout interface itself is clean and clear, using color and progress dots to communicate state at a glance (00:18). Customization is particularly well-handled, with tactile vertical sliders for setting time (02:40) that feel more engaging than standard number pickers.

UX highlights

Visual Progress Indicators: During a workout, dots at the top of the screen clearly indicate the current exercise and round, providing an intuitive sense of progress without clutter.
Tactile Input Controls: Using vertical sliders to adjust time is a unique and satisfying interaction that makes setup fast and almost playful.
Streamlined Customization: The app consolidates all workout parameters onto one main screen, making it easy to configure a complex routine in seconds.
Post-Workout Summary: After completing a session, a clear summary screen (01:45) provides positive reinforcement and access to workout stats.
Inline Exercise Naming: The ability to name exercises within a simple list view (03:01) adds significant personalization and makes saved workouts much more useful.

Monetization & growth

Monetization is approached contextually. After the first workout, the app presents a custom rating prompt (01:46), tapping into the user's sense of accomplishment. The Premium Pass, which unlocks unlimited history and workouts, is not forced on the user but is accessible through the settings (02:18). The paywall offers both a monthly subscription with a 7-day free trial and a lifetime purchase option, catering to different user preferences.

Who it’s for

This app is ideal for self-directed fitness enthusiasts who already have a workout routine and need a powerful, flexible tool to guide them. It's perfect for individuals doing circuit training, HIIT, or Tabata who find generic timers too restrictive. It's less for beginners seeking guided workout content and more for experienced users who want to build and track their own sessions.

Notes & opportunities

The direct-to-utility approach is excellent for its target audience but could be slightly intimidating for a complete novice. While not its primary goal, a small, optional tutorial could broaden its appeal. The history and statistics are behind a premium paywall; offering a very limited version for free could better demonstrate the value of upgrading.