ZoneLock

Train smarter. Stay in your zone.

ZoneLock is a heart rate zone training app built for athletes who train with intent. Connect your chest strap or Apple Watch, pick your zone, and get real-time alerts the moment you push too hard or need to work harder.

Apple Watch and chest strap support, free No subscription needed to train. Use your Apple Watch as your live heart rate source, or connect a Polar H9, H10, or any Bluetooth chest strap. Start a session on your watch and leave your phone behind. Everything syncs automatically, even if your phone was closed during the workout.

Real-time zone alerts Audio and haptic cues the moment you drift above or below target, with a different pattern for each, so you know which way you went without looking at your screen.

Personalised heart rate zones Set up your five training zones using the Karvonen method, refined by a guided submaximal fitness test. ZoneLock calculates your exact BPM ranges and remembers them so every session starts in seconds.

ZoneSignal daily readiness Before every session, ZoneSignal reads your sleep, HRV, resting heart rate, and recent training load to tell you whether to go hard or ease off. No guessing. Just a clear daily signal backed by your own data.

Session history Every session is saved with your time in zone, average BPM, max BPM, and a full breakdown of time spent below, in, and above your target zone.

Built for serious training Zone 1 through Zone 5. Dark mode. Share your session summary. Designed to be readable at arm's length mid-workout.

ZoneLock is free to download and free to train with. Pro unlocks full session history, session stats and trends, and ZoneSignal readiness scoring.

ZoneLock Pro — auto-renewable subscription • Monthly: $2.99 per month • Annual: $19.99 per year

Each plan begins with a 7-day free trial. Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel anytime in your iPhone Settings.

Privacy Policy: https://zonelock.app/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/