Your Watch Knows
More Than You

We translate.

Your Apple Watch collects stride length, ground contact, vertical oscillation. Apple shows you numbers. We tell you what to do with them.

Beta open. Be among the first to unlock your Apple Watch.

Join Beta→
What Apple ignoresCatch up with Garmin

Like Texting
Your Coach

"Should I run today?" "Why are my legs heavy?" Ask anything. Get answers based on YOUR data, not generic advice.

  • AI trained on your 200+ runs from HealthKit
  • Understands stride length, oscillation, ground contact
  • Predicts your race times based on real data
  • Works offline, right on your wrist

Built for
Apple Watch

Not a port. Not compatible. Built from scratch for Apple sensors.

Data → Coaching

Ground contact time up 15ms? We detect fatigue and adjust your pace. Your Watch measures. We interpret.

Pro metrics, translated

HRV-Based Recovery

We read your Heart Rate Variability. Bad night? Your plan adapts before you even ask.

Real-Time on Wrist

Live coaching during your run. No phone needed. Like having a coach running next to you.

Running Power

Apple Watch measures running power. Other apps ignore it. We use it to pace you perfectly.

Your Garmin Friends Have Plans

Now you do too. Adaptive training plans that rival Garmin Coach. Without switching watches.

From Apple Watch
To PR

Runners who stopped envying their Garmin friends

"I missed Garmin Coach so much. Heyfox gave me everything back—and more. The AI actually understands my data. 3:42 marathon."

Alex

Switched from Garmin

"My Watch collected running power for 2 years. I had no idea what to do with it. Now I do. Finally broke 2 hours."

Sam

Sub-2 half marathon

"Bought the Ultra for running. Then realized the software sucked. Heyfox is the app Apple should have built."

Jordan

Apple Watch Ultra owner