# helfu vs Target Zone Keeper

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.

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.

## The numbers

| Metric | helfu | Target Zone Keeper |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/target-zone-keeper/id6673919937/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 7 months** |
| Monetization | — | Free |
| Size | 74 MB | 2 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [vitizine](https://appshunter.io/developer/1718838678) | [Margarita Bliznikova](https://appshunter.io/developer/1765769948) |

## What reviewers say

### helfu

[App page](https://appshunter.io/ios/app/helfu/id6544794218)

**Features:** macOS Compatibility, Vision Pro support

**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 helfu free?

helfu 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.

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

Neither helfu nor Target Zone Keeper shows ads.

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

helfu ships an update every 14 months, and Target Zone Keeper every 7 months. Most recently, helfu was updated on September 13, 2026 and Target Zone Keeper on September 7, 2026.

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