# CO2 Modeller vs Factory 4.0 Project

The clearest difference is update cadence: Factory 4.0 Project at every 2 months against CO2 Modeller's every 36 months. Factory 4.0 Project also leads on review sentiment (100% vs 75%). On price, ads, in-app purchases and monetization model 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, Factory 4.0 Project every 2 months. Both last shipped on October 2, 2026.

## The numbers

| Metric | CO2 Modeller | Factory 4.0 Project |
| --- | --- | --- |
| 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 | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 36 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 9 MB | 206 MB |
| Requires iOS | 12.1 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alex Rogers](https://appshunter.io/developer/346832869) | [Pavla S.A.](https://appshunter.io/developer/543486341) |

## 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


### Factory 4.0 Project

[App page](https://appshunter.io/ios/app/factory-40-project/id1539870974)

This app offers short micro-modules on Industry 4.0 skills for manufacturing professionals. It covers digitalization, collaborative work, and production planning through quizzes and exercises. Subtitles are available for non-English videos.

**Highlights:** Industry 4.0 micro-modules, Digitalization training, Collaborative work modules, Production planning overview, Multiple choice quizzes, Video subtitles

**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 Factory 4.0 Project free?

Factory 4.0 Project is free to download, with no in-app purchases.

### Do CO2 Modeller or Factory 4.0 Project have ads?

Neither CO2 Modeller nor Factory 4.0 Project shows ads.

### Which is updated more often, CO2 Modeller or Factory 4.0 Project?

CO2 Modeller ships an update every 36 months, and Factory 4.0 Project every 2 months. Most recently, CO2 Modeller was updated on October 2, 2026 and Factory 4.0 Project on October 2, 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.*