IntervalGuide: HR & HIIT Timer

tremia.app

Contains adsIn-app purchases

About this app

Your workout. Your rules. IntervalGuide is a fully customizable interval timer for HIIT, Tabata, boxing, and circuit training — built to work exactly the way you train.

Design your interval workout block by block: set work and rest periods, add rounds, choose audio cues, and train in the right heart rate zone. Shake your phone to pause or resume — no need to touch the screen mid-round. Whether you're doing HIIT, boxing rounds, kettlebells, running intervals, or strength-training rest periods, IntervalGuide adapts to your routine, not the other way around.

🥊 HANDS-FREE CONTROL
Shake your phone to pause or resume — no need to remove your gloves, stop your set, or fumble with your screen. Perfect for boxing, kettlebells, winter runs, or any workout where touching your phone isn't an option.

⏱️ FULLY CUSTOMIZABLE TIMERS
Build workouts your way:
• Create unlimited interval blocks with custom durations
• Set work, rest, and preparation phases
• Add rounds and repeats to any block
• Assign colors to visually distinguish each phase
• Save and reuse your favorite workouts

❤️ REAL-TIME HEART RATE
Connect your heart rate monitor and train in the right zone:
• Polar sensors supported out of the box
• Generic Bluetooth Low Energy (BLE) heart rate devices
• Live HR display during workouts
• Customizable heart rate zones

🔊 AUDIO & HAPTIC CUES
Stay focused without watching your screen:
• Voice announcements for phase changes
• Boxing bell and other sound effects
• Vibration alerts to keep you on track
• Works with headphones and speakers

⌚ WEAR OS COMPANION
Control your workout from your wrist:
• Start, pause, and stop from your watch
• See timer and heart rate at a glance
• Full data sync between phone and watch

📊 WORKOUT HISTORY
Track your progress over time:
• Automatic session logging
• Review past workouts with full details
• Heart rate data for every session

🎯 BUILT FOR REAL TRAINING
No bloat, no social features, no accounts required. Just a powerful, reliable interval timer that runs in the foreground and never quits on you mid-workout.

Works great for:
• Boxing & MMA rounds
• HIIT & Tabata
• Strength training rest periods
• Yoga & stretching flows
• Running intervals
• CrossFit-style WODs
• Physical therapy exercises

Download IntervalGuide and build the interval timer that fits your training — not someone else's.

What’s new

• New: in-app update notice — you'll be told when a newer version is available right when you open the app.
• Improved display on Android 15: edge-to-edge layout, system bars now render correctly.
• Stability and under-the-hood improvements.