# Viewport 3D vs Stable Diffusion

The clearest difference is in-app purchases: Viewport 3D at none against Stable Diffusion's 5. Stable Diffusion's advantage is update cadence (every 6 days vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Stable Diffusion sells 5 in-app purchases, starting at $5.99 per 7 days. Viewport 3D asks for nothing beyond the download.

Viewport 3D ships an update every 2 weeks, Stable Diffusion every 6 days. The most recent releases landed on October 5, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Viewport 3D | Stable Diffusion |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 6 days** |
| Size | 47 MB | 15 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 9+ |
| Developer | [Amar Shinde](https://appshunter.io/developer/1896335477) | [Glayzer LLC](https://appshunter.io/developer/1775914442) |

## What reviewers say

### Viewport 3D

[App page](https://appshunter.io/ios/app/viewport-3d/id6777973275)

**In-app purchases:** none


### Stable Diffusion

[App page](https://appshunter.io/ios/app/stable-diffusion-3d-creator/id6799762479)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3D Studio Weekly | $5.99 | per 7 days |
| 3D Studio Annual | $299.99 | per year |
| 100 Credits | $4.99 | one-time |
| 300 Credits | $14.99 | one-time |
| 800 Credits | $39.99 | one-time |


## Frequently asked questions

### Is Viewport 3D free?

Viewport 3D is free to download, with no in-app purchases.

### Is Stable Diffusion free?

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

### Do Viewport 3D or Stable Diffusion have ads?

Neither Viewport 3D nor Stable Diffusion shows ads.

### Which is updated more often, Viewport 3D or Stable Diffusion?

Viewport 3D ships an update every 2 weeks, and Stable Diffusion every 6 days. Most recently, Viewport 3D was updated on October 5, 2026 and Stable Diffusion on October 7, 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.*