# CO2 Modeller vs Climate Change Explorer

The clearest difference is iOS requirement: CO2 Modeller at 12.1 against Climate Change Explorer's 15.0. 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.

CO2 Modeller ships an update every 36 months, Climate Change Explorer every 50 months. The most recent releases landed on October 2, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | CO2 Modeller | Climate Change Explorer |
| --- | --- | --- |
| 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** | Every 50 months |
| Monetization | Free | — |
| Size | 9 MB | 1017 MB |
| Requires iOS | **12.1** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alex Rogers](https://appshunter.io/developer/346832869) | [Historic Environment Scotland](https://appshunter.io/developer/1240194863) |

## 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


### Climate Change Explorer

[App page](https://appshunter.io/ios/app/climate-change-explorer/id1588762276)

**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 Climate Change Explorer free?

Climate Change Explorer is free to download, with no in-app purchases.

### Do CO2 Modeller or Climate Change Explorer have ads?

Neither CO2 Modeller nor Climate Change Explorer shows ads.

### Which is updated more often, CO2 Modeller or Climate Change Explorer?

CO2 Modeller ships an update every 36 months, and Climate Change Explorer every 50 months. Most recently, CO2 Modeller was updated on October 2, 2026 and Climate Change Explorer on October 7, 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.*