# Sleepmax vs HeightGPT

The clearest difference is rating: Sleepmax at 5.0 against HeightGPT's 4.4. Sleepmax also leads on review sentiment (100% vs 83%). HeightGPT's advantage is device support (3 vs 1). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Sleepmax sells 1 in-app purchase, starting at $3.99 per 7 days and HeightGPT sells 2 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Sleepmax holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 8 and 15 respectively. Written reviews point the same way: 100% of Sleepmax's written reviews are positive against 83% of HeightGPT's.

Both ship on a similar rhythm, roughly weekly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Sleepmax | HeightGPT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (8 ratings)](https://appshunter.io/ios/app/sleepmax-sleep-better/id6737427388/reviews)** | [4.4 (15 ratings)](https://appshunter.io/ios/app/heightgpt/id6741367617/reviews) |
| Number of ratings | 8 | **15** |
| Positive reviews | **100.0% of reviews** | 83.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | Freemium | Free with in-app purchases |
| Size | 33 MB | 56 MB |
| Requires iOS | 16.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nine Lives LLC](https://appshunter.io/developer/1775815755) | [Boulevard Legacy LLC](https://appshunter.io/developer/1788132576) |

## What reviewers say

### Sleepmax

[App page](https://appshunter.io/ios/app/sleepmax-sleep-better/id6737427388)

Effortlessly track your sleep patterns and gain insights to improve your rest. Simply place your phone near your pillow and let the app do the work. Wake up to detailed results and suggestions for better sleep.

**Highlights:** Easy sleep tracking, Sleep analysis results, Performance optimization, Personalized suggestions, Subscription for full analysis

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SleepMax Access | $3.99 | per 7 days |


### HeightGPT

[App page](https://appshunter.io/ios/app/heightgpt/id6741367617)

This AI-powered app helps you track and optimize your height growth. It offers personalized training, habit optimization, and predictive analytics based on various factors like genetics and lifestyle. Visualize your progress and achieve your growth potential.

**Highlights:** AI-powered height predictions, Growth visualizations, Personalized training plans, Growth habit optimization, Parental and genetics analysis, Smart to-do list for growth

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $3.99 | per 7 days |
| One Time | $29.99 | one-time |


## Frequently asked questions

### Is Sleepmax free?

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

### Is HeightGPT free?

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

### Which has better reviews, Sleepmax or HeightGPT?

Sleepmax is rated higher. Sleepmax averages 5.0 out of 5 from 8 ratings, while HeightGPT averages 4.4 from 15 ratings.

### Do Sleepmax or HeightGPT have ads?

Neither Sleepmax nor HeightGPT shows ads.

### Which is updated more often, Sleepmax or HeightGPT?

Sleepmax ships an update weekly, and HeightGPT weekly. Most recently, Sleepmax was updated on October 24, 2026 and HeightGPT on October 24, 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.*