# CadioWatch vs Target Zone Keeper

The clearest difference is update cadence: CadioWatch at every 5 days against Target Zone Keeper's every 7 months. CadioWatch also leads on ratings volume (4 vs 1). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for CadioWatch against 5.0 for Target Zone Keeper. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

CadioWatch ships an update every 5 days, Target Zone Keeper every 7 months. The most recent releases landed on September 30, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | CadioWatch | Target Zone Keeper |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/cadiowatch/id1662184405/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/target-zone-keeper/id6673919937/reviews) |
| Number of ratings | **4** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 7 months |
| Monetization | Free | Free |
| Size | 8 MB | 2 MB |
| Requires iOS | **16.0** | 17.6 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [OAXON INC.](https://appshunter.io/developer/1164814009) | [Margarita Bliznikova](https://appshunter.io/developer/1765769948) |

## What reviewers say

### CadioWatch

[App page](https://appshunter.io/ios/app/cadiowatch/id1662184405)

Monitor your heart rate and blood oxygen levels with this companion app for Apple Watch. Easily share your health data charts with doctors, trainers, or family. View your historical health metrics with an intuitive interface.

**Highlights:** Heart rate monitoring, Oxygen saturation tracking, Data sharing via QR code, Historical health data viewing, Intuitive app design

**Features:** macOS Compatibility

**In-app purchases:** none


### Target Zone Keeper

[App page](https://appshunter.io/ios/app/target-zone-keeper/id6673919937)

This app helps improve cardiovascular fitness by guiding users to maintain their heart rate within an optimal zone for VO2 max enhancement. It offers non-disruptive alerts and visual cues, requiring minimal wrist interaction for seamless workout integration.

**Highlights:** Maintains target heart rate zone, Minimal wrist interaction required, Simple, intuitive setup, Customizable, non-disruptive alerts, Personalized heart rate zones, Apple Health integration

**In-app purchases:** none


## Frequently asked questions

### Is CadioWatch free?

CadioWatch is free to download, with no in-app purchases.

### Is Target Zone Keeper free?

Target Zone Keeper is free to download, with no in-app purchases.

### Which has better reviews, CadioWatch or Target Zone Keeper?

CadioWatch and Target Zone Keeper are both rated 5.0 out of 5 on the App Store, from 4 and 1 ratings respectively.

### Do CadioWatch or Target Zone Keeper have ads?

Neither CadioWatch nor Target Zone Keeper shows ads.

### Which is updated more often, CadioWatch or Target Zone Keeper?

CadioWatch ships an update every 5 days, and Target Zone Keeper every 7 months. Most recently, CadioWatch was updated on September 30, 2026 and Target Zone Keeper on October 9, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*