# CO2 vs BGN

The clearest difference is update cadence: CO2 at every 15 months against BGN's every 54 months. CO2 also leads on iOS requirement (12.0 vs 15.6). 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.

CO2 ships an update every 15 months, BGN every 54 months. The most recent releases landed on September 19, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | CO2 | BGN |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 15 months** | Every 54 months |
| Size | 39 MB | 55 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Deutsche Gesetzliche Unfallversicherung e.V. (DGUV)](https://appshunter.io/developer/487126969) | [Berufsgenossenschaft Nahrungsmittel und Gastgewerbe (BGN)](https://appshunter.io/developer/979873922) |

## What reviewers say

### CO2

[App page](https://appshunter.io/ios/app/co2-timer/id1482287779)

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

**In-app purchases:** none


### BGN

[App page](https://appshunter.io/ios/app/bgn-luftungs-app/id1556036903)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CO2 free?

CO2 is free to download, with no in-app purchases.

### Is BGN free?

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

### Do CO2 or BGN have ads?

Neither CO2 nor BGN shows ads.

### Which is updated more often, CO2 or BGN?

CO2 ships an update every 15 months, and BGN every 54 months. Most recently, CO2 was updated on September 19, 2026 and BGN on September 9, 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.*