Phone + chest strap only
Pair a Bluetooth heart-rate strap directly to your iPhone or Android phone. No Apple Watch, Garmin watch, or account setup required.
From the maker of Should I Train
Strap Zone
No watch? Train in live heart-rate zones with your chest strap and phone.
Connect any Bluetooth heart-rate strap, see your BPM and Zone 2 in real time, and finish with a clean time-in-zone summary. No account, no cloud, no subscription.
Free to download. Optional lifetime Pro. Works on iPhone and Android.
Any BLE chest strapLive BPMZone 2 trainingAudio alertsTCX exportNo subscription
Built for the gap
Most zone apps assume you bought a watch. Strap Zone assumes you already have the accurate sensor.
Live zones you can read mid-workout
Big BPM numbers, color-coded Z1-Z5 zones, and a clear Zone 2 display for treadmill, cycling, gym, rowing, and indoor sessions.
Audio and haptic zone alerts
Stay in your target zone without staring at your screen. Alerts tell you when you drift out and when you are back on target.
Optional GPS and TCX export
Keep workouts simple, or record route, distance, pace splits, and export a TCX file for Garmin Connect, Strava, or TrainingPeaks.
Compatibility
Works with the chest strap you probably already own.
Strap Zone reads the standard Bluetooth Low Energy Heart Rate Service, so it is not locked to one device brand.
Need strap-specific setup notes? Read the heart-rate zone app compatibility guide.
Polar H10 / H9 / OH1
Garmin HRM-Pro / HRM-Dual / HRM-Run
Wahoo TICKR / TICKR X / TICKR FIT
COOSPO, Magene, Scosche, and standard BLE straps
Workout flow
Pair the strap. Pick your zone. Finish with useful data.
- 1Put on your Bluetooth chest strap.
- 2Open Strap Zone and scan for devices.
- 3Start a free workout or structured zone session.
- 4Review time in Z1-Z5 and export TCX when you need it.
Need the full setup details? Read the chest strap app guide.
Different tool, same training philosophy
Have a Garmin watch? Use Should I Train. No watch? Use Strap Zone.
Should I Train reads your Garmin recovery data and tells you what to do today. Strap Zone is for athletes who still want clean heart-rate zone training with only a phone and chest strap.
Strap Zone FAQ
Do I need a smartwatch for Strap Zone?
No. Strap Zone is built for people who have a Bluetooth chest strap and a phone, but no smartwatch. The app connects directly to the strap.
Which chest straps work with Strap Zone?
Any standard Bluetooth Low Energy heart-rate strap should work, including Polar H10, Garmin HRM-Pro, Wahoo TICKR, COOSPO, Magene, Scosche, and similar BLE monitors.
Is Strap Zone free?
Strap Zone is free to download. It also offers an optional one-time lifetime Pro upgrade for power-user features. There is no subscription.
Is GPS required?
No. GPS is optional and can be turned off. Heart-rate zone training works with only your chest strap and phone.
No watch. No account. Just zones.
Download Strap Zone, connect your chest strap, and start your next Zone 2 session from your phone.