# Zero CO2 vs Bookers

The clearest difference is in-app purchases: Bookers at none against Zero CO2's 1. Bookers also leads on ads (none vs shown). Zero CO2's advantage is update cadence (every 3 days vs weekly). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Zero CO2 sells 1 one-off in-app purchase. Bookers asks for nothing beyond the download.

Zero CO2 ships an update every 3 days, Bookers weekly. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Zero CO2 | Bookers |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/zero-co2-get-climate-neutral/id1534365588/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | Free with in-app purchases | — |
| Size | 40 MB | 50 MB |
| Requires iOS | 15.5 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [Caramba App Development](https://appshunter.io/developer/349530108) | [Bookers: бронирование услуг](https://appshunter.io/developer/1846106438) |

## What reviewers say

### Zero CO2

[App page](https://appshunter.io/ios/app/zero-co2-get-climate-neutral/id1534365588)

This app tracks your phone's carbon footprint from data usage and helps you offset emissions by planting trees. Monitor your CO2 output and see how your reforestation efforts compensate for it, receiving certificates for each planted tree.

**Highlights:** Monitors phone carbon footprint, Tracks CO2 emissions from data usage, Compensates emissions by planting trees, Visualizes CO2 emissions and tree compensation, Provides certificates for planted trees

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plant your tree | $0.99 | one-time |


### Bookers

[App page](https://appshunter.io/ios/app/bookers/id6503646200)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Zero CO2 free?

Zero CO2 is free to download, with in-app purchases available.

### Is Bookers free?

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

### Do Zero CO2 or Bookers have ads?

Zero CO2 shows ads; Bookers does not.

### Which is updated more often, Zero CO2 or Bookers?

Zero CO2 ships an update every 3 days, and Bookers weekly. Most recently, Zero CO2 was updated on November 3, 2026 and Bookers on November 4, 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.*