# Carnet 4 vs CZSO

The clearest difference is iOS requirement: CZSO at 13.0 against Carnet 4's 15.1. 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.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on September 30, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Carnet 4 | CZSO |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Size | 43 MB | 8 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [FleetCor Deutschland GmbH](https://appshunter.io/developer/1090470381) | [Cesky statisticky urad](https://appshunter.io/developer/805764166) |

## What reviewers say

### Carnet 4

[App page](https://appshunter.io/ios/app/carnet-4/id1584794808)

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

**In-app purchases:** none


### CZSO

[App page](https://appshunter.io/ios/app/czso/id1604362113)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Carnet 4 free?

Carnet 4 is free to download, with no in-app purchases.

### Is CZSO free?

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

### Do Carnet 4 or CZSO have ads?

Neither Carnet 4 nor CZSO shows ads.

### Which is updated more often, Carnet 4 or CZSO?

Carnet 4 ships an update monthly, and CZSO monthly. Most recently, Carnet 4 was updated on September 30, 2026 and CZSO on October 5, 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.*