IntervalGuide vs PowerNap

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 iPhone 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 iPhone 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 - Apple Health integration 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 AirPods APPLE WATCH COMPANION Control your workout from your wrist: - Start, pause, and stop from your Apple Watch - See timer and heart rate at a glance - Full data sync between iPhone and watch WORKOUT HISTORY Track your progress over time: - Automatic session logging - Review past workouts with full details - Heart rate data for every session - Apple Health sync 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. SUBSCRIPTION IntervalGuide Premium removes all ads, unlocks your full workout history with detailed session stats and HR charts, and lets you export sessions as CSV, Excel, JSON or Text. - IntervalGuide Premium: auto-renewing monthly subscription - Free for the first week for new subscribers, then the price shown in the app - Payment is charged to your Apple Account at confirmation of purchase - Renews automatically unless cancelled at least 24 hours before the end of the current period - Manage or cancel anytime in your Apple Account settings Terms of Use (EULA): https://tremia.app/apps/interval-guide/terms-of-service Privacy Policy: https://tremia.app/apps/interval-guide/privacy-policy

Your lunch break ends at a fixed time. So the real question isn't "how long should I nap" — it's "by when should I lie down?" PowerNap is a nap timer built around the watch on your wrist. It estimates sleep onset from heart rate and motion. It starts with a standard 15-minute suggestion. After 5 valid assessments, it uses your history to suggest a duration from 10 to 20 minutes and works backwards from your fixed wake-up time to tell you when to lie down. HOW IT WORKS 1. Set your wake-up time (e.g. 12:55) 2. Lie down by the suggested time and tap Start Nap on your watch 3. Heart rate + stillness estimate sleep onset — no tapping needed 4. Confirm whether you slept and rate grogginess, then rate return-to-work readiness about 30 minutes later After 5 assessed naps, history-based suggestions begin. MADE FOR YOUR WRIST - PowerNap estimates sleep onset from a sustained heart-rate drop and continuously observed stillness. Resting while awake can still resemble sleep. - Last night's sleep duration, resting heart rate and HRV shown as reference information - Backup notifications on both watch and iPhone - Without sufficient heart-rate data, no sleep estimate is made; the scheduled alarm still works. TRACK AND UNDERSTAND - Every nap recorded automatically: estimated onset and sleep duration, heart-rate curve - Wake-up and 30-minute assessments, weekly charts and start-time patterns - Insights based on your own answers and history - The heart-rate graph for your latest completed, non-cancelled nap is included without a purchase. Access moves to the next completed nap; older graphs require Pro. - Sleep totals and averages include estimates only when you confirm that you slept. No, unsure and unanswered records are excluded. POWERNAP PRO (ONE-TIME PURCHASE) A one-time Pro purchase unlocks history-based suggestions, older heart-rate graphs, history charts and insights. No subscription. With Pro, optionally wake before the scheduled alarm when the estimated sleep duration reaches your target. PRIVATE BY DESIGN Nap, heart-rate and assessment records are processed on your devices and are not sent to our servers. No ads, tracking or accounts. Purchases communicate with Apple through StoreKit. - Requires a watch running watchOS 10 or later - PowerNap is not a medical device and is not intended to diagnose or treat any condition. Sleep onset is estimated from heart rate and motion.