# CO2 Modeller vs CO₂ AR

The clearest difference is update cadence: CO₂ AR at daily against CO2 Modeller's every 36 months. 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 Modeller ships an update every 36 months, CO₂ AR daily. The most recent releases landed on October 2, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | CO2 Modeller | CO₂ AR |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (2 ratings)](https://appshunter.io/ios/app/co2-modeller/id1037101261/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 36 months | **Daily** |
| Monetization | Free | — |
| Size | 9 MB | 95 MB |
| Requires iOS | 12.1 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alex Rogers](https://appshunter.io/developer/346832869) | [Ekkehard Petzold](https://appshunter.io/developer/1156102927) |

## What reviewers say

### CO2 Modeller

[App page](https://appshunter.io/ios/app/co2-modeller/id1037101261)

Simulate the impact of reducing carbon emissions on climate change. This app generates projections for atmospheric CO2 concentration, global warming, sea level rise, and ocean acidification.

**Highlights:** Model carbon emission reductions, Simulate climate change effects, Project CO2 concentration, Estimate global warming, Predict sea level rise, Analyze ocean acidification

**Features:** macOS Compatibility

**In-app purchases:** none


### CO₂ AR

[App page](https://appshunter.io/ios/app/co-ar/id1296287523)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CO2 Modeller free?

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

### Is CO₂ AR free?

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

### Do CO2 Modeller or CO₂ AR have ads?

Neither CO2 Modeller nor CO₂ AR shows ads.

### Which is updated more often, CO2 Modeller or CO₂ AR?

CO2 Modeller ships an update every 36 months, and CO₂ AR daily. Most recently, CO2 Modeller was updated on October 2, 2026 and CO₂ AR on September 30, 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.*