# CO2 Risk Calculator vs Magnetometer...

The clearest difference is in-app purchases: CO2 Risk Calculator at none against Magnetometer...'s 2. CO2 Risk Calculator also leads on ads (none vs shown) and iOS requirement (11.0 vs 15.0). On price and device support there is nothing between them.

Both are free to download. Magnetometer... sells 2 in-app purchases, starting at $1.99 per month. CO2 Risk Calculator asks for nothing beyond the download.

## The numbers

| Metric | CO2 Risk Calculator | Magnetometer... |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | — |
| Size | 6 MB | 97 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Logico2 International AB](https://appshunter.io/developer/1208875120) | [Olga Ivanova](https://appshunter.io/developer/1733570435) |

## What reviewers say

### CO2 Risk Calculator

[App page](https://appshunter.io/ios/app/co2-risk-calculator/id1019495878)

**In-app purchases:** none


### Magnetometer...

[App page](https://appshunter.io/ios/app/magnetometer/id6808420517)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| magnetometer_by_oliva_subscription | $1.99 | per month |
| magnetometer_by_oliva_donation | $1.99 | one-time |


## Frequently asked questions

### Is CO2 Risk Calculator free?

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

### Is Magnetometer... free?

Magnetometer... is free to download, with in-app purchases available.

### Do CO2 Risk Calculator or Magnetometer... have ads?

Magnetometer... shows ads; CO2 Risk Calculator does not.

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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.*