# CO2 Modeller vs Atmospheric Model

The clearest difference is rating: Atmospheric Model at 5.0 against CO2 Modeller's 2.5. Atmospheric Model also leads on review sentiment (100% vs 75%). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Atmospheric Model holds the better App Store score, 5.0 against 2.5. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews point the same way: 75% of CO2 Modeller's written reviews are positive against 100% of Atmospheric Model's.

Both ship on a similar rhythm, roughly every 36 months. The most recent releases landed on October 2, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | CO2 Modeller | Atmospheric Model |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.5 (2 ratings)](https://appshunter.io/ios/app/co2-modeller/id1037101261/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/atmospheric-model/id1299565883/reviews)** |
| Number of ratings | **2** | 1 |
| Positive reviews | 75.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 36 months | Every 36 months |
| Monetization | Free | Free |
| Size | 9 MB | 12 MB |
| Requires iOS | 12.1 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alex Rogers](https://appshunter.io/developer/346832869) | [Richard Loda](https://appshunter.io/developer/1291794366) |

## 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


### Atmospheric Model

[App page](https://appshunter.io/ios/app/atmospheric-model/id1299565883)

Explore planetary atmospheres with a radiative transfer model. Calculate emission temperatures and flux densities, then modify parameters like albedo and solar constant to simulate atmospheric changes and their effects on climate.

**Highlights:** Radiative transfer model for planetary atmospheres, Calculates emission temperature and flux densities, Adjustable parameters: albedo, distance from sun, extinction coefficients, Supports 9 solar system planets or custom planets, Generates flux diagrams of incoming and outgoing radiation, Saves and compares two model run results, Exports data to CSV for spreadsheet analysis

**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 Atmospheric Model free?

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

### Which has better reviews, CO2 Modeller or Atmospheric Model?

Atmospheric Model is rated higher. CO2 Modeller averages 2.5 out of 5 from 2 ratings, while Atmospheric Model averages 5.0 from 1 ratings.

### Do CO2 Modeller or Atmospheric Model have ads?

Neither CO2 Modeller nor Atmospheric Model shows ads.

### Which is updated more often, CO2 Modeller or Atmospheric Model?

CO2 Modeller ships an update every 36 months, and Atmospheric Model every 36 months. Most recently, CO2 Modeller was updated on October 2, 2026 and Atmospheric Model on October 10, 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.*