# О!Касса vs E

The clearest difference is iOS requirement: О!Касса at 13.0 against E's 15.6. On price, update cadence, ads 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.

О!Касса ships an update every 4 weeks, E every 3 weeks. Both last shipped on October 25, 2026.

## The numbers

| Metric | О!Касса | E |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 3 weeks** |
| Size | 47 MB | 15 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [NUR Telecom LLC](https://appshunter.io/developer/1202124575) | [IBERICA GROUP, TOO](https://appshunter.io/developer/1709317073) |

## What reviewers say

### О!Касса

[App page](https://appshunter.io/ios/app/id1639977551)

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

**In-app purchases:** none


### E

[App page](https://appshunter.io/ios/app/e-kassa/id6467878788)

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

**In-app purchases:** none


## Frequently asked questions

### Is О!Касса free?

О!Касса is free to download, with no in-app purchases.

### Is E free?

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

### Do О!Касса or E have ads?

Neither О!Касса nor E shows ads.

### Which is updated more often, О!Касса or E?

О!Касса ships an update every 4 weeks, and E every 3 weeks. Most recently, О!Касса was updated on October 25, 2026 and E on October 25, 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.*