# Zero Carbon vs StayValid

The clearest difference is iOS requirement: Zero Carbon at 11.0 against StayValid's 13.0. On price, ads, in-app purchases and device support 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 | Zero Carbon | StayValid |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | — |
| Size | 22 MB | 21 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TheTowerTech](https://appshunter.io/developer/1259751444) | [Brunno Bortolotto](https://appshunter.io/developer/1872277031) |

## What reviewers say

### Zero Carbon

[App page](https://appshunter.io/ios/app/zero-carbon-connect/id6447286723)

**Features:** macOS Compatibility

**In-app purchases:** none


### StayValid

[App page](https://appshunter.io/ios/app/stayvalid/id6758322870)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Zero Carbon free?

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

### Is StayValid free?

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

### Do Zero Carbon or StayValid have ads?

Neither Zero Carbon nor StayValid shows ads.

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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.*