Question 1

What is ZoneLock?

Accepted Answer

ZoneLock is a free heart rate zone training app for iOS and Android. It connects to Bluetooth chest straps like the Polar H9 and H10 and alerts you through your earphones when your heart rate drifts above or below your target zone.

Question 2

What does ZoneLock do?

Accepted Answer

ZoneLock reads your live heart rate from a connected chest strap or Apple Watch. When you drift outside your target zone it plays an audio cue through your earphones. When you return to the zone it goes silent. No phone checking needed during your workout.

Question 3

How does ZoneLock work?

Accepted Answer

Before your session you set a target heart rate zone by BPM range. ZoneLock connects to your Bluetooth heart rate monitor and reads your live BPM throughout the session. The zone engine uses 8 seconds of hysteresis to avoid false alerts from single stray readings. After your session you see a summary showing time in zone, above zone, and below zone.

Question 4

Does ZoneLock work with Polar H9 and H10?

Accepted Answer

Yes. ZoneLock works with the Polar H9, Polar H10, and any standard Bluetooth LE heart rate monitor that broadcasts on the standard heart rate service UUID 0x180D.

Question 5

Is ZoneLock free?

Accepted Answer

Yes. ZoneLock is free to download and the core features are free, including live heart rate monitoring, zone alerts, and the Apple Watch app. ZoneLock Pro unlocks unlimited session history, session stats and trends, and ZoneSignal daily training readiness for $2.99 per month or $19.99 per year with a 7-day free trial.

Question 6

Does ZoneLock have an Apple Watch app?

Accepted Answer

Yes, and it is free. ZoneLock includes a standalone Apple Watch companion app that runs a full session without your phone present and syncs the session back to your phone automatically.

Question 7

Who is ZoneLock for?

Accepted Answer

ZoneLock is for any athlete who trains with heart rate zones. Runners, cyclists, swimmers, triathletes, and court sport players all benefit from real-time zone alerts. Anyone doing Zone 2 base training will get the most out of it.