# HD DIFFUSION vs Happystar

HD DIFFUSION and Happystar are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

HD DIFFUSION ships an update every 27 months, Happystar every 23 months. The most recent releases landed on November 7, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | HD DIFFUSION | Happystar |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 27 months | **Every 23 months** |
| Size | 65 MB | 64 MB |
| Requires iOS | 11.0 | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HD DIFFUSION](https://appshunter.io/developer/1569843650) | [HAPPY STAR](https://appshunter.io/developer/1589950793) |

## What reviewers say

### HD DIFFUSION

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Happystar

[App page](https://appshunter.io/ios/app/happystar/id1589950791)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HD DIFFUSION free?

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

### Is Happystar free?

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

### Do HD DIFFUSION or Happystar have ads?

Neither HD DIFFUSION nor Happystar shows ads.

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

HD DIFFUSION ships an update every 27 months, and Happystar every 23 months. Most recently, HD DIFFUSION was updated on November 7, 2026 and Happystar on October 29, 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.*