Heart rate zone tracker · iOS 26

Your heart rate zone, where you can actually see it.

Zonas keeps your live zone on the Lock Screen, in the Dynamic Island, and floating over any app. Start a workout, put your phone away, and still know your effort at a glance.

47 workout types · five zones · no app account, no app cloud

RUNNING 24:18
Zone 3 · Steady 148bpm

Start here

Four ways in

The one it solves

The number that never disappears

Every other zone app has the same flaw. Open music, check a message, follow a workout video, and your heart rate is gone. Zonas floats a small overlay over any app, so your effort stays in view the whole time.

How Picture-in-Picture works
Music · Now Playing
162 Hard
Always visible

Live on the Lock Screen and Dynamic Island

Your zone updates in real time through Live Activities. On iPhones with Dynamic Island, the current zone sits at the top of the screen while you do anything else. Glance down, read it, move on.

See the always-on surfaces
140 · Aerobic
Honest math

Zones that match the science

Zonas uses heart rate reserve (Karvonen) when it knows your resting heart rate, and percent of max heart rate when it does not. It estimates max with the Tanaka formula and never invents data it does not have.

Read the methodology
Max HR (Tanaka)187
Resting HR60
Zone 3 · Steady148–160
Built on real guidance

Not made up. Sourced.

Karvonen & Tanaka

Zone math follows established formulas, with truncation that matches the app to the beat.

WHO weekly goals

Weekly cardio uses 150–300 moderate-equivalent minutes, the way public-health guidance is written.

On your device

Every calculation runs locally. No server reads your heart rate to make any of this work.

Privacy

No app account. No app cloud. No health-data tracking.

Your heart rate and workouts live in Apple Health on your device. Zonas has no server for your health data, no app analytics, and no login. Payments are handled by Apple. That is not a feature bolted on — it is how the app is built.

Read the privacy policy

Keep your zone in view.

Zonas is an iOS 26 app for iPhone, with an Apple Watch companion.

Download on the App Store