# CD4 Hunter vs The Weather Layer

The clearest difference is update cadence: CD4 Hunter at every 3 months against The Weather Layer's every 64 months. CD4 Hunter also leads on iOS requirement (7.0 vs 11.0). 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.

CD4 Hunter ships an update every 3 months, The Weather Layer every 64 months. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | CD4 Hunter | The Weather Layer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (17 ratings)](https://appshunter.io/ios/app/cd4-hunter/id1186846022/reviews)** | — |
| Number of ratings | **17** | — |
| Positive reviews | 92.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 64 months |
| Monetization | Free | — |
| Size | 178 MB | 65 MB |
| Requires iOS | **7.0** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Drexel University](https://appshunter.io/developer/410950254) | [Science Education Institute](https://appshunter.io/developer/1439710468) |

## What reviewers say

### CD4 Hunter

[App page](https://appshunter.io/ios/app/cd4-hunter/id1186846022)

Engage in a fast-paced educational game where you embody an HIV virion. Infect target cells, grow your viral population, and evade the immune system to learn about viral replication. Designed for higher education biomedical science curricula.

**Highlights:** Simulate HIV-1 virion behavior, Infect target cells in the bloodstream, Grow and control viral population, Evade immune system attacks, Learn HIV-1 replication cycle, Interactive gameplay for science education

**In-app purchases:** none


### The Weather Layer

[App page](https://appshunter.io/ios/app/the-weather-layer/id1439731258)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CD4 Hunter free?

CD4 Hunter is free to download, with no in-app purchases.

### Is The Weather Layer free?

The Weather Layer is free to download, with no in-app purchases.

### Do CD4 Hunter or The Weather Layer have ads?

Neither CD4 Hunter nor The Weather Layer shows ads.

### Which is updated more often, CD4 Hunter or The Weather Layer?

CD4 Hunter ships an update every 3 months, and The Weather Layer every 64 months. Most recently, CD4 Hunter was updated on October 24, 2026 and The Weather Layer on October 28, 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.*