Simple Interval Timer

Simple Interval Timer (SIT) is a straightforward interval training app designed for athletes, fitness enthusiasts, and anyone who needs structured timing for their activities. Whether you're running, cycling, doing HIIT sessions (including Tabata method), stretching, or even managing focus sessions for work or study, SIT provides a clean, distraction-free timer experience.

Key Features

• Easy Configuration: Adjust the number of sets, action duration, and break duration to match your exact workout or focus needs • Background Operation: Runs seamlessly in the background while you play music, watch videos, or use other apps on your iOS device • Multiple Saved Configurations: Remembers your last 5 timer setups, allowing quick switching between different routines via swipe gestures • Apple Watch Integration: Full-featured watchOS companion app that runs independently of your iPhone and tracks heart rate during workouts, syncing data to Apple's Health app • Home Screen Widgets: Add your favorite timer configurations to your home screen for one-tap timer starts • Screen Lock Prevention: Optional setting to keep your screen active during workouts • Haptic & Audio Feedback: Clear haptic and audio cues to signal the start of sets and breaks, even when the app is in the background

Who It's For

SIT has proven invaluable for runners and cyclists managing interval training, HIIT practitioners following structured workout protocols, and people with ADHD who use interval timing to maintain focus during daily tasks or study sessions. Users have even found creative applications like timing Kegel exercises and pacing while reading dense textbooks.

What Makes It Different

Unlike complex fitness apps with cluttered interfaces, SIT focuses on doing one thing exceptionally well: interval timing. Its minimalist design eliminates unnecessary controls while maintaining powerful functionality. The app reliably works in the background across all iOS activities, and the Apple Watch app operates independently—perfect for phone-free workouts. With support for landscape mode, adjustable volume, dark mode, and localization in multiple languages, SIT balances simplicity with thoughtful feature implementation.