helfu vs Target Zone Keeper
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
helfu
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help for your health Check your health habits with Hellfu. Main functions Find the information you need to stay healthy Find the products you need to stay healthy Please seek the advice of your physician before using this app or making any medical decisions.
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: Target Zone Keeper at every 7 months against helfu's every 14 months. helfu's advantage is iOS requirement (14.0 vs 17.6). On price, ads, in-app purchases and device support 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.
helfu ships an update every 14 months, Target Zone Keeper every 7 months. The most recent releases landed on September 13, 2026 and September 7, 2026 respectively.
| Parameter | helfu | Target Zone Keeper |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 14 months | Every 7 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, Apple Watch |
| Requires iOS | 14.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 74 MB | 2 MB |
| Age rating | 12+ | 4+ |
| Developer | vitizine | Margarita Bliznikova |
In-app purchases
helfu
No in-app purchases
Target Zone Keeper
No in-app purchases
