# S4DX Samples vs Stopa

The clearest difference is in-app purchases: S4DX Samples at none against Stopa's 2. S4DX Samples also leads on iOS requirement (15.5 vs 26.0). Stopa's advantage is update cadence (monthly vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Stopa sells 2 in-app purchases, starting at $5.99 per month. S4DX Samples asks for nothing beyond the download.

S4DX Samples ships an update every 3 months, Stopa monthly. The most recent releases landed on October 7, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | S4DX Samples | Stopa |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Size | 80 MB | 23 MB |
| Requires iOS | **15.5** | 26.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [S4DX GmbH](https://appshunter.io/developer/1530214621) | [Peter Buchlak](https://appshunter.io/developer/1896636698) |

## What reviewers say

### S4DX Samples

[App page](https://appshunter.io/ios/app/s4dx-samples/id1530214619)

**In-app purchases:** none


### Stopa

[App page](https://appshunter.io/ios/app/stopa-ai-training-plans/id6776153318)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stopa Pro (Monthly) | $5.99 | per month |
| Stopa Pro (Annual) | $49.99 | per year |


## Frequently asked questions

### Is S4DX Samples free?

S4DX Samples is free to download, with no in-app purchases.

### Is Stopa free?

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

### Do S4DX Samples or Stopa have ads?

Neither S4DX Samples nor Stopa shows ads.

### Which is updated more often, S4DX Samples or Stopa?

S4DX Samples ships an update every 3 months, and Stopa monthly. Most recently, S4DX Samples was updated on October 7, 2026 and Stopa on October 16, 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.*