CadioWatch vs Target Zone Keeper
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CadioWatch
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.
- Heart rate monitoring
- Oxygen saturation tracking
- Data sharing via QR code
- Historical health data viewing
- Intuitive app design
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Introducing CardioWatch for Apple Watch - the ultimate heart health companion! With our advanced heart rate and oxygen saturation monitoring technology, you can now track your beats per minute and oxygen level, and easily share your data with others. Simply scan the QR code generated by the app to share your heart rate and oxygen saturation chart with your doctor, personal trainer, or loved ones. Our intuitive app design also makes it easy to view your heart rate and oxygen saturation history. Download CardioWatch today and take control of your heart and lung health!
Target Zone Keeper
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.
- Maintains target heart rate zone
- Minimal wrist interaction required
- Simple, intuitive setup
- Customizable, non-disruptive alerts
- Personalized heart rate zones
- Apple Health integration
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Want to improve your endurance and cardiovascular fitness? Boosting your VO2 max - the amount of oxygen your body uses during intense exercise - is the key. Target Zone Keeper helps you achieve this by keeping your heart rate in the optimal zone. With a simple, intuitive interface (no complex setup!), it offers visual cues and haptic feedback to keep you focused without interrupting your flow, even when you’re wearing a gloves or simply can’t turn your wrist! Key features - Keeps you in the target heart rate zone with minimal to none wrist interaction - Simple, intuitive setup for easy use right out of the box - Non-disruptive, customizable alerts - Personalized heart rate zones focused on VO2 max improvement - Seamless integration with Apple Health for workout tracking Benefits - Get instant feedback without disrupting your workout flow - Optimize your training specifically for VO2 max improvement
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | CadioWatch | Target Zone Keeper |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | 1 |
| Update frequency | Every 5 days — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, Apple Watch |
| Requires iOS | 16.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 8 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | OAXON INC. | Margarita Bliznikova |
Customer experience
CadioWatch
Target Zone Keeper
In-app purchases
CadioWatch
No in-app purchases
Target Zone Keeper
No in-app purchases
Questions
Is CadioWatch free?
Is Target Zone Keeper free?
Which has better reviews, CadioWatch or Target Zone Keeper?
Do CadioWatch or Target Zone Keeper have ads?
Which is updated more often, CadioWatch or Target Zone Keeper?
Other comparisons
