# Target Zone Keeper vs Strength Balance

The clearest difference is in-app purchases: Target Zone Keeper at none against Strength Balance's 1. Strength Balance's advantage is update cadence (every 3 weeks vs every 7 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Strength Balance sells 1 one-off in-app purchase. Target Zone Keeper asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Target Zone Keeper against 5.0 for Strength Balance. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

Target Zone Keeper ships an update every 7 months, Strength Balance every 3 weeks. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Target Zone Keeper | Strength Balance |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/target-zone-keeper/id6673919937/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/strength-balance/id6757344250/reviews) |
| Number of ratings | 1 | **2** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 2 MB | 1 MB |
| Requires iOS | **17.6** | 18.6 |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Margarita Bliznikova](https://appshunter.io/developer/1765769948) | [James Panter](https://appshunter.io/developer/1862807051) |

## What reviewers say

### 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


### Strength Balance

[App page](https://appshunter.io/ios/app/strength-balance/id6757344250)

This app helps strength athletes identify and correct muscle imbalances by tracking key lifts and analyzing strength ratios. It provides insights to focus training and build proportional strength across all major movement patterns.

**Highlights:** Track major compound lifts, Automatic strength ratio calculations, Identify muscle imbalances, Personal record tracking, Distraction-free interface, Private on-device data storage

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support The Developer | $2.99 | one-time |


## Frequently asked questions

### Is Target Zone Keeper free?

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

### Is Strength Balance free?

Strength Balance is free to download, with in-app purchases available.

### Which has better reviews, Target Zone Keeper or Strength Balance?

Target Zone Keeper and Strength Balance are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do Target Zone Keeper or Strength Balance have ads?

Neither Target Zone Keeper nor Strength Balance shows ads.

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

Target Zone Keeper ships an update every 7 months, and Strength Balance every 3 weeks. Most recently, Target Zone Keeper was updated on October 30, 2026 and Strength Balance on November 5, 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.*