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