# Wow Height vs PerformanceX

The clearest difference is update cadence: Wow Height at every 2 weeks against PerformanceX's monthly. On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Wow Height sells 2 in-app purchases, starting at $1.99 per month and PerformanceX sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Wow Height ships an update every 2 weeks, PerformanceX monthly. The most recent releases landed on June 4, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Wow Height | PerformanceX |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/wow-height/id6740035196/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | Freemium | Free with in-app purchases |
| Size | 10 MB | 119 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Haijian Yan](https://appshunter.io/developer/1767976220) | [顽石运动智能科技(北京)有限公司](https://appshunter.io/developer/1112625269) |

## What reviewers say

### Wow Height

[App page](https://appshunter.io/ios/app/wow-height/id6740035196)

This app helps parents scientifically track and analyze their child's growth from infancy to adolescence. It allows for recording measurements, viewing growth percentiles, and predicting future height based on current data and genetics. It's designed to provide professional insights into children's health and development trends.

**Highlights:** Child growth monitoring, Height and weight tracking, Growth percentile analysis, Future height prediction, Genetic factor integration, Development milestone tracking

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Membership | $1.99 | per month |
| Yearly Membership | $6.99 | per year |


### PerformanceX

[App page](https://appshunter.io/ios/app/performancex/id6745584273)

This app uses advanced video analysis and biomechanical algorithms to provide precise jump performance testing and data analysis for athletes and coaches. It offers various jump tests, strength-speed relationship analysis, and functional strength assessments, with detailed biomechanical parameter calculations.

**Highlights:** Vertical jump testing (CMJ, SJ, DJ), Strength-speed relationship analysis, Functional strength testing (Nordic Hamstring), Automatic biomechanical parameter calculation, Video analysis with high frame rate support, Athlete and team data management, CSV data export

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度会员 | $2.99 | per month |
| 年度会员 | $24.99 | per year |
| 终身会员 | $59.99 | one-time |


## Frequently asked questions

### Is Wow Height free?

Wow Height is free to download, with in-app purchases available.

### Is PerformanceX free?

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

### Do Wow Height or PerformanceX have ads?

Neither Wow Height nor PerformanceX shows ads.

### Which is updated more often, Wow Height or PerformanceX?

Wow Height ships an update every 2 weeks, and PerformanceX monthly. Most recently, Wow Height was updated on June 4, 2026 and PerformanceX on September 15, 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.*