# H vs HD DIFFUSION

The clearest difference is update cadence: H at every 4 months against HD DIFFUSION's every 27 months. 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.

H ships an update every 4 months, HD DIFFUSION every 27 months. The most recent releases landed on September 17, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | H | HD DIFFUSION |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 27 months |
| Size | 64 MB | 65 MB |
| Requires iOS | 11.0 | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [H-3](https://appshunter.io/developer/1450275159) | [HD DIFFUSION](https://appshunter.io/developer/1569843650) |

## What reviewers say

### H

[App page](https://appshunter.io/ios/app/h-3/id1078140711)

**Features:** macOS Compatibility

**In-app purchases:** none


### HD DIFFUSION

[App page](https://appshunter.io/ios/app/hd-diffusion/id1569843648)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is H free?

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

### Is HD DIFFUSION free?

HD DIFFUSION is free to download, with no in-app purchases.

### Do H or HD DIFFUSION have ads?

Neither H nor HD DIFFUSION shows ads.

### Which is updated more often, H or HD DIFFUSION?

H ships an update every 4 months, and HD DIFFUSION every 27 months. Most recently, H was updated on September 17, 2026 and HD DIFFUSION 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.*