Heart Rate Zones Trainer

Turn your age and resting pulse into five precise heart-rate zones — and know the exact BPM to hit for fat loss, endurance, or your next race.

Turn your age and resting pulse into five precise heart-rate training zones — so every run, ride, and workout finally has a purpose instead of a guess.

Most people train at the wrong intensity: too hard on easy days, too easy on hard days. HeartZone fixes that. It calculates your personal beats-per-minute ranges using proven sports-science formulas (Fox and Tanaka for max HR, plus the Karvonen heart-rate-reserve method), then guides you to stay in the zone that matches your goal. Live sessions read your heart rate from Apple Watch, so you can see your time-in-zone build in real time.

WHAT YOU GET

• Five personalized zones — Recovery, Aerobic Base, Aerobic, Threshold, and Maximum — with exact BPM ranges for your body
• A clear target BPM for any goal: burn fat, build endurance, raise your threshold, or stay healthy
• Guided live sessions that track time-in-zone from Apple Watch heart rate in real time
• Full session history with time-in-zone charts and your resting-heart-rate trend over time
• Two max-HR formulas (Fox, Tanaka) and two zone models (%HRmax, Karvonen) you can switch anytime
• A plain-English Learn library explaining what each zone trains, with cited scientific sources

PERFECT FOR

• Runners and cyclists who want to train by heart rate, not just pace
• Beginners building an aerobic base and finally understanding Zone 2
• Anyone chasing fat loss who needs the right fat-burning intensity
• Athletes doing threshold and VO2 max intervals who need precise targets

WHY NOT JUST USE A GENERIC FITNESS APP Most apps show your heart rate but never tell you what to do with it. HeartZone translates the number into meaning: which zone you're in, what it trains, and the exact range to hit for today's goal — with the science to back it up.

PRIVACY Every session, profile, and reading stays on your device. No accounts, no ads, no tracking.

FULL ACCESS HeartZone Premium unlocks guided live sessions, unlimited session history with resting-HR trends, and all target and zone tools. Choose the plan that fits:

• Weekly subscription
• Yearly subscription
• Lifetime (one-time purchase)

Start with your resting heart rate and see your five zones in under a minute.

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