BurnCoach

Heart Rate Zone 2 Fat Burn

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

Stay in Zone 2 — where your body burns the most fat. BurnCoach checks your heart rate every second and tells you to slow down or pick up the pace. Hands-free. Real-time heart rate coaching for the most efficient fat-burning intensity: Zone 2. Your Apple Watch keeps you in the sweet spot — not too fast, not too slow — every second of your workout. Diet results come from intensity, not just time. ■ Why BurnCoach is different • Built for Zone 2 — Not just a heart rate display. BurnCoach tells you exactly how to adjust, every moment. • Voice + haptic coaching — Don't even look at your wrist. Cues drop into your music like Apple Maps navigation. • Auto phases — Warm-up, main, and cool-down transition automatically based on time and intensity. • Live glow ring — The ring color changes the instant you cross zones, glanceable on your wrist. ■ Core features • Real-time heart rate + zone detection (Rest, Warm-up, Fat Burn, Cardio, Peak, Max) • Automatic Zone-time and Fat Burn duration tracking • Post-workout report — zone distribution, average/max BPM, calories, GPS route (outdoor) • Two-way HealthKit sync — pulls in workouts from other apps and writes back yours • Live Activity / Dynamic Island — see your zone from the lock screen • Pace coaching — voice cues to slow down or speed up • Bluetooth heart rate monitors — pair a chest strap and train with iPhone only, no watch needed • Start from iPhone — remotely launch the watch workout, or start right on iPhone with your HRM ■ Why Zone 2 matters Zone 2 (60–70% of max heart rate) is where your body uses fat as the primary fuel. • Faster (Zone 3+): you burn more carbs, less fat efficiency. • Slower (Zone 1): not enough caloric demand to matter. If your goal is weight loss, time-in-Zone-2 is the most honest metric. ■ With or without a watch • Standalone Apple Watch — runs entirely on your watch; leave your iPhone at home. History syncs when reconnected. • No watch? — pair a Bluetooth heart rate monitor (chest strap) and get the same real-time zone coaching on iPhone alone. • Smart audio routing — coaching speaks through your earphones when connected, or your watch speaker when not. ■ Privacy first All workout data stays on your device. No external servers. HealthKit access is fully controlled by you. ■ Requirements • iPhone: iOS 17 or later • Apple Watch: watchOS 10 or later (optional — Series 4 and newer recommended) • Bluetooth heart rate monitor: standard heart rate profile devices (optional — for training without a watch) Make every 30 minutes count.

Ratings & Reviews

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1.0.1 — Language fixes • Fixed screens that still showed Korean text when the app was used in English, Japanese, or Chinese. Workout, reports, history, settings, and the Watch app were all re-checked. • Fixed interval voice coaching speaking in the wrong language. • Notifications such as weekly goal completion now follow your language too. • Detailed report PDFs and share images now follow the app language, dates included. • Permission prompts, widgets, Live Activity, and the Watch complication now follow your language too.

Version 1.0.1

The developer, Byoungho Kim, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Byoungho Kim
    Size
    • 5.6 MB
    Category
    • Health & Fitness
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    • Apple Watch
      Requires watchOS 26.5 or later.
    Location
    • This app may use your location even when it isn’t open, which can decrease device battery life.
    Languages
    English and 3 more
    • English, Japanese, Korean, Simplified Chinese
    Age Rating
    9+
    In-App Purchases
    Yes
    Copyright
    • © 2026 blueCode
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More

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