Strap Zone: HR Zone 2 Training

Turtle Tunes Studio

In-app purchases

About this app

Strap Zone connects your Bluetooth heart rate chest strap directly to your phone — no smartwatch required. See your heart rate zones in real-time and train smarter.

Strap Zone Pro starts with a 7-day annual trial. Prefer paying once? A lifetime unlock is available too.

SIMPLE HEART RATE ZONE TRAINING
Just heart rate zones and workouts, with optional GPS route export when you want it. No social features, no complicated coaching. Connect your chest strap, start your workout, done. The simplest heart rate monitor app for your phone.

LIVE HEART RATE MONITOR
Big, readable BPM display that's easy to see during any workout. Watch your heart rate update in real-time with color-coded zone backgrounds.

HEART RATE ZONES (Z1–Z5)
See your current training zone instantly:
• Zone 1 — Recovery
• Zone 2 — Endurance & Fat Burning
• Zone 3 — Tempo
• Zone 4 — Threshold
• Zone 5 — VO2 Max

Perfect for zone 2 training, the science-backed method for building aerobic endurance, burning fat, and improving longevity. Stay in your target heart rate zone with audio alerts.

STRUCTURED WORKOUTS
Build custom workouts with target heart rate zones, timed segments, and repeat blocks. Ideal for HIIT heart rate training, threshold intervals, or guided zone 2 cardio sessions.

TIME-IN-ZONE TRACKING
See exactly how long you spent in each heart rate zone during and after your workout. Track your fat burning zone time, endurance zone time, and more.

WORKOUT HISTORY
Review past sessions with detailed zone breakdowns and heart rate data.

OPTIONAL HEALTH CONNECT EXPORT
Off by default. If you opt in, Strap Zone can write your completed workouts and the recorded data you select to Health Connect: heart rate, estimated active energy, distance and GPS route, when system permissions allow. Strap Zone never imports health data from other apps.

GPS ROUTE + TCX EXPORT
Optionally record route, distance, pace splits, and export a complete TCX file for platforms like Strava, Garmin Connect, and TrainingPeaks. GPS can be turned off anytime in Settings.

WORKS WITH ALL BLUETOOTH CHEST STRAPS
Compatible with any BLE heart rate strap:
• Polar H10, H9, OH1
• Garmin HRM-Pro, HRM-Dual, HRM-Run
• Wahoo TICKR, TICKR X, TICKR FIT
• COOSPO, Magene, Scosche
• And any other standard Bluetooth heart rate monitor

No smartwatch needed. Connect your heart rate strap directly to your phone.

CUSTOMIZABLE HEART RATE ZONES
Set your personal HR Max for accurate zone calculations. Editable zone boundaries let you customize for your fitness level and training goals.

PRIVACY FIRST
No account required. No heart-rate or GPS route data leaves your device unless you explicitly enable an export.

Perfect for runners, cyclists, gym workouts, indoor cycling, treadmill training, rowing, CrossFit, or any activity where you want to monitor your heart rate zones without wearing a smartwatch.

Train in your zones. Train smarter.

What’s new

New in Strap Zone:

* A clearer Strap Zone Pro screen explains the 7-day free trial and when billing starts.
* Lifetime access remains available as a one-time purchase.
* Small polish and stability improvements.