KO Interval Timer

What It Does

KO Interval Timer is a dedicated iOS app for athletes, fitness enthusiasts, and trainers who need precise, customizable interval timers for boxing, HIIT, circuit training, stretching, and any round-based workout. With voice coaching, sound cues, and a built-in workout journal, it helps you stay focused during sessions and track progress over time.

Who It's For

Designed for boxers, martial artists, personal trainers, and anyone doing interval-based training, KO Interval Timer is ideal for users who want more control than a basic stopwatch offers but don't need complex workout planning software. Whether you're timing sparring rounds, Tabata intervals, or recovery stretches, this app adapts to your routine.

Key Features & Capabilities

• Flexible Timer Builder: Set custom work and rest periods, choose the number of rounds, add preparation countdowns, and assign custom names to each phase. Save favorite timers and duplicate them for variations.
• Audio & Voice Coaching: Select from multiple timer sounds, spoken countdowns, and coaching voices. Customize start, phase-change, and completion cues with optional haptic and visual alerts.
• Workout Journal: Log completed sessions with notes, photos, tags, pre/post-workout feelings, difficulty ratings, and optional bodyweight tracking. Your journal is stored locally on your device—no cloud upload or account signup required.
• Progress Tracking: Review workout history, total rounds completed, elapsed time, training streaks, and activity trends. Revisit past sessions to see what worked best.
• Widgets & Siri Shortcuts: Access saved timers via home-screen widgets and start sessions with Siri voice commands for quick, hands-free setup.
• Personalization: Choose accent colors, preferred sounds, and coaching voice. Enable keep-screen-awake mode to keep your timer visible throughout your workout.

Important to Know

KO Interval Timer is designed for foreground use—keep the app open and your screen awake during sessions, as it does not provide background or lock-screen timer alerts. An internet connection is needed to verify subscription access. The app requires an active subscription to use the timer and protected features; available plans, prices, and billing periods are displayed before purchase. Subscriptions renew automatically via your Apple account unless cancelled.

Privacy & Data

Your workout history, notes, and photos stay on your device. The app does not upload your journal to external servers and does not require a KO Interval Timer account. Cross-device syncing and cloud backup are not supported.