Made by one person, on purpose
Zonas is an independent app with a simple opinion: during a workout, your heart rate zone should stay where you can see it.
Most heart rate apps make you keep the app open. Zonas was built because that felt wrong. If the point is real-time feedback, the feedback should survive the moment you open music, maps, messages, or a workout video.
The app is iOS 26 only. That keeps the code focused on the current HealthKit workout model instead of carrying old platform paths. It supports Bluetooth heart rate monitors, Apple Watch, 47 workout types, Live Activities, Dynamic Island, Picture-in-Picture, and Apple Health.
It is also local-first. The app has no Zonas account, cloud sync, app analytics, or health-data tracking layer. Heart rate and workout data stay on your device and in Apple Health.
Why The Website Exists
The app needs a place for the details that do not belong inside a workout screen: calculation methods, device setup, privacy, support, and change notes. This site is that place.
It should read like clear product documentation, not a growth funnel. The app either helps you train with less friction or it does not. The site should make that easy to judge.
Sources
- AVPictureInPictureController
Zonas uses the system Picture-in-Picture API for its floating heart rate overlay.
- Displaying live data with Live Activities
Live Activities are the system feature behind Lock Screen and Dynamic Island workout surfaces.
- startMirroringToCompanionDevice
Zonas Apple Watch support uses HealthKit workout session mirroring.