# Wow Height vs HDLC

The clearest difference is update cadence: Wow Height at every 2 weeks against HDLC's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Wow Height sells 2 in-app purchases, starting at $1.99 per month and HDLC sells 5 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Wow Height ships an update every 2 weeks, HDLC every 3 weeks. The most recent releases landed on June 4, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Wow Height | HDLC |
| --- | --- | --- |
| 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** | Every 3 weeks |
| Monetization | Freemium | — |
| Size | 10 MB | 70 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Haijian Yan](https://appshunter.io/developer/1767976220) | [玉钊 蓝](https://appshunter.io/developer/1822284648) |

## 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 |


### HDLC

[App page](https://appshunter.io/ios/app/hdlc-personalized-data-center/id6747672905)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1个月会员订阅 | $0.99 | per month |
| 3个月会员订阅 | $1.99 | per 3 months |
| 6个月会员订阅 | $3.99 | per 6 months |
| 12个月会员订阅 | $7.99 | per year |
| 永久会员 | $19.99 | one-time |


## Frequently asked questions

### Is Wow Height free?

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

### Is HDLC free?

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

### Do Wow Height or HDLC have ads?

Neither Wow Height nor HDLC shows ads.

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

Wow Height ships an update every 2 weeks, and HDLC every 3 weeks. Most recently, Wow Height was updated on June 4, 2026 and HDLC on September 10, 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.*