heart-rate zone training where you can actually see it.

an iphone and apple watch app for heart-rate zone training. it shows your live zone on the lock screen, dynamic island, and as a picture-in-picture overlay, so you can keep training without keeping the app open.

• shows real-time heart rate zones during workouts.
• works with apple watch and bluetooth heart-rate monitors.
• keeps your zone visible via live activities, dynamic island, and pip.
• saves workout data to apple health.

built for visible cardio training

zonas is for workouts where seeing your current effort matters. start a session, connect an apple watch or bluetooth heart-rate monitor, and keep your zone visible while you train, change music, follow a route, or use another app.

heart-rate sources and apple health

zonas reads heart-rate data from apple watch or standard bluetooth low energy heart-rate monitors such as chest straps and arm bands. with your permission, it can read and write workout data through apple health.

health and accuracy

heart-rate zones are training estimates. they depend on your sensor, your permissions, your settings, and the calculation method used by the app. zonas is not medical advice, diagnosis, treatment, or a substitute for professional care.

privacy and subscriptions

no account system, no developer-run cloud service. workout and heart-rate data stay on your device and in apple health. payments, subscriptions, renewals, and refunds are handled by apple through the app store.