l'orange

Train smarter. Live longer. Your heart knows the way.

l'orange transforms your Apple Watch into a precision heart rate training tool, guiding you to spend time in the "Orange Zone" — the 84-91% max heart rate sweet spot where cardiovascular magic happens.

WHY THE ORANGE ZONE?

Research shows that consistent training in this zone delivers exceptional benefits: improved VO₂ max, lower resting heart rate, enhanced heart rate variability, and reduced cardiovascular disease risk. Each 1 mL/kg/min increase in VO₂ max is associated with a 10-15% reduction in all-cause mortality. The Orange Zone is where fitness meets longevity.

REAL-TIME WATCH APP

Your Apple Watch displays live heart rate with instant zone feedback. Know exactly when you're in the zone, when to push harder, and when to ease back. Works independently — no phone required during workouts.

COMPREHENSIVE ANALYTICS

The companion iPhone app delivers professional-grade training insights:

• Readiness Score — Daily training readiness based on HRV, sleep, and recovery
• TRIMP Analysis — Banister's Training Impulse quantifies your training load
• ACWR Monitoring — Acute:Chronic Workload Ratio tracks injury risk
• Heart Rate Recovery — Post-exercise HR drop indicates autonomic health
• Cardiac Drift & Aerobic Decoupling — Efficiency metrics for endurance training
• Fitness-Fatigue Model — Predict performance with CTL/ATL/TSB tracking
• Sleep Integration — See how sleep quality impacts your recovery
• Cardiovascular Risk Profile — 8-factor assessment of heart health
• Training Phase Detection — Periodization support for optimal progression
• Personalized HR Zones — Calculated from your lactate threshold heart rate

INSIGHTS THAT MATTER

Weekly summaries, trend analysis, and actionable recommendations help you understand your body's response to training. Set reminders for workouts, track consistency, and celebrate personal bests.

EXPORT YOUR DATA

Your data belongs to you. Export in JSON, CSV, Markdown, or Apple Notes format anytime.

PRIVACY FIRST

l'orange reads your health data directly from Apple HealthKit — and that's where it stays. No accounts. No cloud uploads. No tracking. No ads. Your heart rate data never leaves your devices. We believe health data is deeply personal, and we've built l'orange to respect that completely.

ONE PURCHASE. FOREVER YOURS.

$9.99 unlocks everything. No subscriptions. No in-app purchases. No premium tiers. Every feature, every update, every improvement — included for life. We believe fitness apps shouldn't require ongoing fees to access your own health insights.

REQUIREMENTS

• Apple Watch with heart rate sensor
• iPhone with iOS 18+
• HealthKit permissions for heart rate, workouts, and sleep

Start your Orange Zone journey today. Your future self will thank you.