iPhone · Apple Health

Your weekly heart-rate zones, clearly.

Just Zones turns the heart-rate data from your Apple Watch workouts in Apple Health into an honest, weekly time-in-zone picture — Zone 2 minutes included, with zones by % max HR, Karvonen (HRR) or LTHR. See how much time you spent in each zone, and how it compares to your usual week (the median of up to four previous weeks) — read more on weekly time in zone and how zones are calculated, or try the heart rate zone calculator.

Download on the App Store

Z1 Recovery → Z5 Max, this week

Just Zones Week screen: time in each heart-rate zone this week

Four things it does. Nothing it doesn't.

Zones per workout

Every workout, every zone — choose % of max HR, Karvonen (heart-rate reserve), LTHR or your own custom bounds, all free, with the zone bounds shown. Add a free weekly target for any zone, such as Zone 2 minutes.

Trends by period

Week, month, or your full history — how your time-in-zone shifts over weeks, not just one workout.

Route map by zone

Runs and rides with GPS get their route coloured by heart-rate zone, with auto splits per kilometre.

Privacy by default

Health data stays on your device. No accounts, no ads. Crash reports, purchase handling, the start point of a route (sent to Apple Maps for place names) and, only if you agree, usage analytics are the only data that leave the phone.

Free is generous. Pro is one thing.

Free

  • Week screen, any week
  • Every workout, full detail, any age
  • Full zone setup, share as image
  • Trends sampler — last 30 days

Pro

  • Trends over your full history — weekly & monthly, week vs week

$9.99 once

One-time purchase, no subscription. Family Sharing included.