# CO₂ AR vs Folens Library

The clearest difference is iOS requirement: CO₂ AR at 11.0 against Folens Library's 13.0. On price, ads, in-app purchases and device support there is nothing between them.

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

## The numbers

| Metric | CO₂ AR | Folens Library |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Daily | — |
| Size | 95 MB | 1 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ekkehard Petzold](https://appshunter.io/developer/1156102927) | [Folens Publishing Company](https://appshunter.io/developer/510958206) |

## What reviewers say

### CO₂ AR

[App page](https://appshunter.io/ios/app/co-ar/id1296287523)

**Features:** macOS Compatibility

**In-app purchases:** none


### Folens Library

[App page](https://appshunter.io/ios/app/folens-library/id6742751194)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CO₂ AR free?

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

### Is Folens Library free?

Folens Library is free to download, with no in-app purchases.

### Do CO₂ AR or Folens Library have ads?

Neither CO₂ AR nor Folens Library shows ads.

---

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