Your heart rate
drives your trainer.
Zone Pedal watches your heart rate and adjusts your smart trainer's resistance in real time. Not fixed watts — your body's actual response controls the ride. It learns how your heart responds, so every ride gets more precise. All you need is a Bluetooth heart rate monitor and a smart trainer. $29.99 once. No subscription.
Pair devices. Pick a workout. Pedal.
Pair devices
Connect your Bluetooth heart rate monitor and smart trainer. Chest strap recommended for the fastest control response. Zone Pedal talks directly to both devices on your phone.
Pick a workout
Choose from 13 workouts across four categories. Each one is built specifically for HR-guided control, from calibration and threshold testing to endurance and high intensity.
Pedal
The math runs on your phone, estimates the right power, and trims resistance in real time to keep the session where it belongs.
Your workout stays in zone. Even when you don't.
Fixed ERG Workout
Cardiac drift and fatigue push the session away from the intended zone.
Zone Pedal
The control loop trims resistance to keep heart rate in range as the ride changes.
The math runs on your phone: feedforward sets the starting load, heart rate feedback keeps the workout honest.
Built to compensate for cardiac drift as the ride progresses, with warmup readiness checks before intervals begin.
Your Body, clearly.
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Builds your baseline
After 3 interval workouts, the Your Body tab starts showing your cardiac fitness trend with honest change from your own baseline.
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Estimates your aerobic threshold
The Threshold Finder workout uses DFA alpha1 — fractal analysis of your RR intervals — to estimate where your aerobic threshold sits, without a lab test. Track how it changes over time.
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Estimates your VO2max
Your Bayesian cardiac model (built from interval workouts) feeds a VO2max estimate with confidence intervals and a fitness category based on age- and sex-adjusted norms.
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Checks readiness first
With a compatible heart rate strap, warmup readiness builds a 5-ride baseline and flags the day as Ready, Moderate, or Recovery Day.
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Eases off on off days
On Moderate or Recovery days, interval targets can ease slightly to match how you are showing up, and you can always override it.
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Follow your ride from the Lock Screen
Live Activity shows your current zone, heart rate, and power on the Lock Screen and Dynamic Island without unlocking your phone.
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Turns history into insight
After each ride, you get clear post-ride insights including cardiac response, recovery quality, and precision improvement. Interval workouts build your fitness trend over time.
13 Workouts, 4 Categories
Start Here
- Discover Your Cardiac Response — a guided 20-minute ride that reveals how your heart responds to effort, with real-time learning messages as the system measures you
- Threshold Finder — 35-minute stepped ramp that estimates your aerobic threshold from DFA alpha1 fractal analysis of your heart rate variability
Endurance
- Zone 2 Aerobic Base — 30 to 90 minutes of steady aerobic work with adaptive resistance trimming
- Tempo Ride — sustained Zone 3 effort, podcast-friendly
- Recovery Ride — easy spinning that stays safely below Zone 2
- Steady Zone — pick any zone (1–5) and duration, and the trainer holds you there
Threshold
- Sweet Spot — long effort right below your limit
- Threshold Intervals — sustained hard efforts at your limit with recovery between (2x20 or 3x15)
High Intensity
- Norwegian 4x4 — 4 x 4 min hard / 3 min easy
- Seiler 4x8 — 4 x 8 min hard / 5 min easy
- Tabata — 8 x 20s max effort / 10s rest
- Billat 30/30 — 3 sets of 10 x 30s on / 30s off
- Rønnestad 30/15 — 3 sets of 13 x 30s on / 15s off
Start with Discover Your Cardiac Response. One 20-minute session reveals how your heart responds to effort, and that knowledge makes your Zone 2 rides more precise.
Import Any Zwift Workout
Open any .zwo file and Zone Pedal makes it heart-rate-adaptive. Thousands of existing Zwift workouts, upgraded with real-time HR control. Preview the structure before you ride.
All data stays on your device.
Zone Pedal stores your profile and ride history locally on your phone. If you enable Apple Health, completed workout summaries are written there too.
No account. No analytics. No server.
One purchase. Full app.
One-Time Purchase
- All 13 workouts included
- HR-adaptive trainer control
- No subscription and no account
Available on the App Store.
$29.99 iPhone app. No recurring billing, no cloud tier, no unlock flow.
Heart rate monitor plus smart trainer.
Bluetooth HR Monitor
Any Bluetooth heart rate monitor works. A chest strap is recommended for the fastest and cleanest control response.
Most Smart Trainers
Zone Pedal directly controls FTMS-compatible smart trainers over Bluetooth for real-time resistance changes during the ride.
Tacx Neo and Legacy Trainers
Some Tacx trainers use FE-C over BLE, and Cycling Power Service telemetry is supported when available for tighter ride feedback.