ZoneSteady

ZoneSteady turns your Apple Watch into a powerful heart rate zone training tool — completely free, no subscription required.

* Apple Watch is required.

Start a workout on your Apple Watch and instantly see your real-time heart rate mirrored on your iPhone with a color-coded zone display. Whether you're warming up in Zone 1 or pushing your limits in Zone 5, ZoneSteady makes it effortless to train at the right intensity.


REAL-TIME HEART RATE ZONES
• Live heart rate streaming from Apple Watch to iPhone
• 5 color-coded training zones calculated using the Karvonen formula
• Full-screen zone display with bold, glanceable design
• Signal detection alerts you when heart rate data is lost


CUSTOMIZABLE ZONES
• Personalize your zone boundaries with Manual Override
• Adjust individual zone BPM thresholds to match your training plan
• Cascading logic ensures zones never overlap or leave gaps
• Percentages update in real-time as you fine-tune each zone
• Custom zones sync automatically to your Apple Watch
• Reset to scientifically-calculated defaults anytime


17 WORKOUT TYPES
• Running, cycling, swimming, hiking, strength training, HIIT, yoga, rowing, and more
• Start from your Watch or your iPhone — your choice

WORKOUT HISTORY
• Every session saved automatically with duration, calories, distance, and zone breakdown
• Visual zone timeline shows how your effort shifted throughout each workout
• Share workout summary cards with friends and training partners


BUILT FOR APPLE WATCH
• Native watchOS companion app with real-time zone display
• Works with Apple HealthKit for accurate, sensor-level heart rate data
• Landscape and portrait support on iPhone

100% FREE
• No subscription. No paywall. No trials.
• Professional-grade training tools available to everyone.


REQUIREMENTS
• Apple Watch Series 3 or later with watchOS 10+
• iPhone with iOS 17+
• Apple Health app with heart rate permissions enabled