# Ostaz vs C.S.A.

The clearest difference is device support: C.S.A. at 3 against Ostaz's —. Ostaz's advantage is iOS requirement (12.0 vs 15.6). On price and in-app purchases there is nothing between them.

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

## The numbers

| Metric | Ostaz | C.S.A. |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | — | Every 3 months |
| Size | 61 MB | 54 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mohammed Elmahdy](https://appshunter.io/developer/1575092250) | [DataRays](https://appshunter.io/developer/1175740339) |

## What reviewers say

### Ostaz

[App page](https://appshunter.io/ios/app/ostaz/id6584520592)

**In-app purchases:** none


### C.S.A.

[App page](https://appshunter.io/ios/app/csa/id6717588190)

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

**In-app purchases:** none


## Frequently asked questions

### Is Ostaz free?

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

### Is C.S.A. free?

C.S.A. is free to download, with no in-app purchases.

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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.*