# CO2 Modeller vs Relativistic Space

The clearest difference is rating: Relativistic Space at 3.0 against CO2 Modeller's 2.5. Relativistic Space also leads on review sentiment (100% vs 75%). CO2 Modeller's advantage is update cadence (every 36 months vs every 75 months). On price, ratings volume, 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.

Relativistic Space holds the better App Store score, 3.0 against 2.5. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews point the same way: 75% of CO2 Modeller's written reviews are positive against 100% of Relativistic Space's.

CO2 Modeller ships an update every 36 months, Relativistic Space every 75 months. The most recent releases landed on October 2, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | CO2 Modeller | Relativistic Space |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.5 (2 ratings)](https://appshunter.io/ios/app/co2-modeller/id1037101261/reviews) | **[3.0 (2 ratings)](https://appshunter.io/ios/app/relativistic-space-time/id1463093650/reviews)** |
| Number of ratings | 2 | 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 75 months |
| Monetization | Free | Free |
| Size | 9 MB | 52 MB |
| Requires iOS | **12.1** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alex Rogers](https://appshunter.io/developer/346832869) | [Thieberson Gomes](https://appshunter.io/developer/1434771806) |

## 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


### Relativistic Space

[App page](https://appshunter.io/ios/app/relativistic-space-time/id1463093650)

This educational tool simulates the behavior of space and time at high speeds. Developed as part of a master's dissertation, it focuses on relativistic effects without considering acceleration.

**Highlights:** Relativistic velocity simulation, Space-time behavior visualization, Pedagogical tool, Master's dissertation project

**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 Relativistic Space free?

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

### Which has better reviews, CO2 Modeller or Relativistic Space?

Relativistic Space is rated higher. CO2 Modeller averages 2.5 out of 5 from 2 ratings, while Relativistic Space averages 3.0 from 2 ratings.

### Do CO2 Modeller or Relativistic Space have ads?

Neither CO2 Modeller nor Relativistic Space shows ads.

### Which is updated more often, CO2 Modeller or Relativistic Space?

CO2 Modeller ships an update every 36 months, and Relativistic Space every 75 months. Most recently, CO2 Modeller was updated on October 2, 2026 and Relativistic Space on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*