# Between The Lines vs CO2

The clearest difference is update cadence: Between The Lines at every 6 months against CO2's every 15 months. CO2's advantage is iOS requirement (12.0 vs 15.0). 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.

Between The Lines ships an update every 6 months, CO2 every 15 months. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Between The Lines | CO2 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 40.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 15 months |
| Monetization | Free | — |
| Size | 3 MB | 39 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Between The Lines e. V.](https://appshunter.io/developer/1181031286) | [Deutsche Gesetzliche Unfallversicherung e.V. (DGUV)](https://appshunter.io/developer/487126969) |

## What reviewers say

### Between The Lines

[App page](https://appshunter.io/ios/app/between-the-lines/id1181031287)

This app provides information and resources for individuals experiencing emotional distress or uncertainty. It offers expert-verified guidance and connects users with relevant support services. The app is free and ad-free, serving as a first point of contact for mental well-being.

**Highlights:** Expert-verified information, Support service directory, Ad-free experience, Free to use, Information for emotional distress

**Features:** macOS Compatibility

**In-app purchases:** none


### CO2

[App page](https://appshunter.io/ios/app/co2-timer/id1482287779)

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

**In-app purchases:** none


## Frequently asked questions

### Is Between The Lines free?

Between The Lines is free to download, with no in-app purchases.

### Is CO2 free?

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

### Do Between The Lines or CO2 have ads?

Neither Between The Lines nor CO2 shows ads.

### Which is updated more often, Between The Lines or CO2?

Between The Lines ships an update every 6 months, and CO2 every 15 months. Most recently, Between The Lines was updated on November 2, 2026 and CO2 on November 7, 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.*