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The Best Zone 2 Apps for Apple Watch, Garmin and Android (2026)

Short answer: if you only want to see heart rate zones, the apps already on your watch are free and good enough. If you want a Zone 2 range built from your own numbers and a clear answer on whether a workout counted, you need a dedicated app. Below is every serious option for Apple Watch, Garmin and Android, what each one is best at, and what it costs.

How we judged them

Zone 2 is narrow and personal. The question that matters is not how pretty the chart is, but three things:

1. Where the range comes from. A percentage of an age-estimated maximum, a heart rate reserve calculation that uses your resting heart rate, or your own measured numbers.
2. Whether it works during the workout. A screen on your wrist that tells you to slow down is worth more than a report afterwards.
3. Whether it tells you the session counted. Time-in-zone bars do not say whether those minutes were one continuous block or scattered across a ride.

The quick comparison

App	Works with	Best at	Price (US)
Apple Workout app	Apple Watch	Free live zones	Free
Garmin heart rate zones	Garmin	Free, configurable zones	Free
Zone2AI	Apple Watch, Garmin, Android	Personal range and a verdict per workout	$3.99/week, $24.99/year or $39.99 once
Athlytic	Apple Watch	Recovery and strain scores	$4.99/month or $29.99/year
Whoop	Whoop band	24/7 recovery tracking	Membership from $199/year
Zones for Training	Apple Watch	Cheap custom zone display	$7.99 one time (Pro)
HeartWatch	Apple Watch	Deep heart rate history	$8.99 one time
Training Today	Apple Watch	A daily train-or-rest call	$2.95/month, $29.99/year or $59.99 lifetime

1. Apple's Workout app (free)

Every Apple Watch since watchOS 9 shows five heart rate zones live during a workout. Apple's own support page describes the zones as a percentage of your maximum heart rate, personalized from your health data, and they need your date of birth. You can also set them by hand in the Watch app.

Best for: anyone starting out. The catch: the maximum behind the zones is estimated, and if it is off, every zone moves with it. Apple shows time in each zone but does not tell you whether the session was a real Zone 2 session. We wrote about this in why your Apple Watch Zone 2 can be wrong.

2. Garmin's built-in zones (free)

Garmin lets you set zones by beats per minute, percent of maximum heart rate, percent of heart rate reserve or percent of lactate threshold, and different zones per sport. That is more control than any other watch maker gives you, for free.

Best for: Garmin owners who know their real maximum or lactate threshold. The catch: the defaults start from your profile's age-based maximum, sport-specific zones can quietly override the general ones, and few people ever change either. If your Zone 2 feels too easy or too hard on a Garmin, that is usually why.

3. Zone2AI (Apple Watch, Garmin, Android)

Zone2AI builds a Zone 2 range with the heart rate reserve method from three inputs: the highest heart rate seen in your own workouts, your resting heart rate, and how hard each session felt, which nudges the range by about 1 percent per session within a 5 percent cap. After every workout it reports the continuous minutes you spent inside that range, warm-up excluded, and whether the session counted toward your weekly goal.

It runs as a watch app on Apple Watch and on Garmin through Connect IQ, and on Android phones through Health Connect (Galaxy Watch, Pixel Watch, Fitbit and Garmin). More than half of Zone2AI users wear a Garmin. There is no account and no login, and a $39.99 lifetime option sits beside the weekly and yearly plans.

Best for: people who want to know whether their Zone 2 was real Zone 2, on whatever watch they already own. The catch: it is a focused Zone 2 and VO2 max coach, not a 24/7 sleep and recovery tracker, and the personal range sharpens over the first weeks as it sees your workouts.

4. Athlytic (Apple Watch)

Athlytic turns Apple Watch data into recovery, exertion and sleep scores, with live heart rate zones during workouts. It is one of the most polished recovery apps on the App Store.

Best for: Apple Watch owners who want a Whoop-style recovery score without a new band. The catch: it is built around recovery and strain, not around a Zone 2 verdict, and it is Apple only, so Garmin and Android users are out. See our Athlytic alternative for Zone 2 page for a direct comparison.

5. Whoop (its own band)

Whoop is a screenless band with a membership, currently from $199 a year for the base tier. Its heart rate zones use heart rate reserve, and its strength is round-the-clock recovery, strain and sleep tracking.

Best for: people who want 24/7 recovery data and do not mind a second device. The catch for Zone 2: there is no screen, so it cannot keep you in zone during the session unless you watch your phone. If you already own an Apple Watch or Garmin, you are paying for a sensor you already wear.

6. Zones for Training (Apple Watch)

A simple, low-cost app that shows custom heart rate zones on Apple Watch, with a $7.99 one-time Pro upgrade. You set the zones; it shows them clearly.

Best for: people who already know their numbers. The catch: the zones are only as good as the maximum you type in.

7. HeartWatch (Apple Watch)

A long-running heart rate analytics app, $8.99 up front with no subscription. Excellent for looking back at resting heart rate, daily patterns and workout heart rate.

Best for: data lovers on Apple Watch. The catch: analysis, not coaching. It will not tell you what to do next.

8. Training Today (Apple Watch)

Training Today gives a single daily read on whether to train hard or easy, based on heart rate variability, at $2.95 a month, $29.99 a year or $59.99 lifetime.

Best for: deciding which days should be easy. The catch: it answers "how hard today", not "was that real Zone 2".

Which one should you pick?

• Just starting, any watch: use the free zones on your watch and the talk test for a month.
• You want a recovery score: Athlytic on Apple Watch, or Whoop if you want a dedicated band.
• You know your real maximum or threshold: Garmin custom zones or Zones for Training.
• You want your Zone 2 from your own numbers and a verdict after every workout, on Apple Watch, Garmin or Android: Zone2AI.

Whatever you choose, the minutes matter more than the app. Three or more sessions a week, held at a pace where you can talk but would rather not, is what builds the engine. If you want to sanity-check your range first, try our free Zone 2 heart rate by age calculator.