# Just Zones: Heart Rate Zone 2 — Weekly cardio minutes & trends

> Analyze Apple Health heart rate zone data and workout trends. (iPhone/iPad app by Guinea Pig Software Development Inc..)

- Source: https://appshunter.io/ios/app/just-zones-heart-rate-zone-2/id6812169998 (this page in markdown: same URL + `.md`)
- Developer: [Guinea Pig Software Development Inc.](https://appshunter.io/developer/1895295065)
- Category: Health & Fitness
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 26.0 · 14 MB
- Languages: American English
- Released: 2026-09-24
- Data updated: 2026-11-10
- Monetization: free with in-app purchases

## What is Just Zones?

Just Zones turns the workouts you already record in Apple Health into an honest, weekly picture of time spent in each heart-rate zone.

WHAT IT DOES
• Week view: time in each zone this week, compared with last week and your usual (median of your last 4 weeks)
• Every workout, in full detail: heart-rate curve, minutes per zone, histogram, best sustained heart rate over rolling windows, and zone-change count
• Runs and rides with GPS: route map coloured by heart-rate zone, with auto splits
• Effort and recovery: elevated-effort intervals and recovery phases inferred from your heart-rate curve, for any workout type
• Strength, swimming and 50+ other workout types each get the detail HealthKit actually provides — the app tells you plainly when Apple Watch doesn't record something (e.g. reps or weight for strength workouts), instead of guessing
• Zone model shown, not hidden: uses Apple's own recorded zones when a workout has them, otherwise a clearly labelled heart-rate-reserve (Karvonen) estimate — with the exact BPM bounds and inputs always visible
• Manual zone settings: adjust max heart rate, resting heart rate, LTHR and age yourself if you don't want the app's estimate

TRENDS (PRO)
See your last 30 days of trends for free — weekly intensity mix, when you train, and more. Just Zones Pro extends Trends to your full history — one-time purchase, Family Sharing included, no subscription. Everything else in the app — Week, every workout at any age, and sharing a workout as an image — stays free, always.

PRIVACY
Just Zones reads workouts and heart-rate data from Apple Health — read-only, it never writes anything back. Your health data is processed and stored on your device. The app has no accounts and no backend of its own. It sends anonymous crash reports and handles purchases through third-party services; your health data is never included in either.

REQUIREMENTS
Requires an iPhone with workout and heart-rate data in Apple Health — recorded by Apple Watch, the Workout app, or another app that writes to Health. Just Zones does not record its own workouts and has no Apple Watch app.

## Key features

- Weekly heart rate zone analysis
- Detailed workout metrics
- Route maps colored by zone
- Effort and recovery phase detection
- Customizable heart rate zone models
- Privacy-focused on-device processing

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Just Zones Pro | $9.99 | one-time |


## Is Just Zones safe?

Not enough ratings yet to assess Just Zones.

## Is Just Zones legit?

Just Zones: Heart Rate Zone 2 appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Just Zones is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Frequently asked questions about Just Zones

### What is Just Zones?

Just Zones analyzes your heart rate zone data from workouts logged in Apple Health. It provides weekly summaries, detailed workout breakdowns, and insights into effort and recovery phases, all processed on your device.

### Does Just Zones record workouts?

No, Just Zones does not record its own workouts. It reads data from Apple Health, which can be generated by the Apple Watch, the Workout app, or other compatible apps.

### How does Just Zones calculate heart rate zones?

Just Zones uses Apple's recorded zones when available. If not, it provides a heart-rate-reserve (Karvonen) estimate, with the BPM bounds and inputs always visible. You can also manually set your max heart rate, resting heart rate, and LTHR.

### Is my health data safe with Just Zones?

Yes, Just Zones prioritizes privacy. It reads data from Apple Health read-only, never writes back, and processes all health data on your device. The app has no accounts or backend, and anonymous crash reports do not include health data.

### What are the 'Trends (Pro)' features in Just Zones?

The free version shows 30 days of trends for weekly intensity mix and training times. Just Zones Pro, a one-time purchase, extends these trends to your full history and includes Family Sharing.

### What devices is Just Zones compatible with?

Just Zones requires an iPhone with workout and heart-rate data in Apple Health. It does not have an Apple Watch app.

### How often is Just Zones updated?

The latest version is 1.3.1, released on November 4, 2026. The app was last updated on November 4, 2026, indicating regular updates.

### What is the age rating for Just Zones?

Just Zones has an age rating of 4+, making it suitable for users of all ages who meet the device requirements.

## Version history (last 5 releases)

### 1.3.1 — 2026-11-04

Fixes a rare crash on the route screen.

### 1.3.0 — 2026-11-02

New in 1.3.0:
• Resting heart rate trend on Trends, free: from Apple Health, by day, week, month, 6 months, year or all time.
• Resting heart rate on each Week day card.
• Your resting heart rate in Zone Setup.

### 1.2.2 — 2026-10-26

New in 1.2.2:
• See why Just Zones and Health can place the same heart rate in different zones.
• Route summaries read more naturally with on-device intelligence on supported devices.

### 1.2.1 — 2026-10-17

New in 1.2.1:
• Pace by zone for runs.
• Workouts: month headers with the year for older workouts.
• 3D route relief now starts at the route's lowest point.
• Fixes for the Week chart, Trends totals and the full-screen map.
• Optional usage analytics. After setup, Just Zones asks once whether you want to share usage data: which screens and features you use, never any Health data. It stays off unless you say yes, and you can change your answer any time in Settings › Data & privacy.

### 1.2 — 2026-10-13

New in 1.2:
• iPhone Duo: two-column layouts on the inner display.
• 3D route relief, coloured by heart-rate zone.
• Route map at the top of every workout with a route.
• Place names beside workout dates.
• Swipe between workouts and days.
• Trends follow the selected period, with two new charts.
• Walking and more workout-type filters, with redesigned chips.
• Dates now include the year.
• Faster 3D and many fixes.

## Apps similar to Just Zones

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Zone 2 Training Coach](https://appshunter.io/ios/app/zone-2-training-coach/id6762536918) | 5.0 (1) | Free | Health & Fitness |
| [HR Zones Weekly](https://appshunter.io/ios/app/hr-zones-weekly/id6766235464) | — | Free | Health & Fitness |
| [ZoneView: Heart Rate Zones](https://appshunter.io/ios/app/zoneview-heart-rate-zones/id6786846242) | 1.0 (1) | Free | Health & Fitness |
| [Cadence: Heart Rate Zones](https://appshunter.io/ios/app/cadence-heart-rate-zones/id6759876311) | 5.0 (1) | Free | Health & Fitness |
| [Zonometry](https://appshunter.io/ios/app/zonometry/id6813688959) | — | Free | Health & Fitness |
| [Heart Rate Zones: Underdog](https://appshunter.io/ios/app/heart-rate-zones-underdog/id6758392759) | — | Free | Health & Fitness |

## More apps by Guinea Pig Software Development Inc.

- [Bouncer: Jump Rope Counter](https://appshunter.io/ios/app/bouncer-jump-rope-counter/id6763396174)
- [Nyamly: AI Calorie Counter](https://appshunter.io/ios/app/nyamly-ai-calorie-counter/id6806109078)

All apps by Guinea Pig Software Development Inc.: https://appshunter.io/developer/1895295065

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-10.*