# greenApes vs Zero CO2

The clearest difference is rating: Zero CO2 at 5.0 against greenApes's 4.5. Zero CO2 also leads on update cadence (every 3 days vs every 2 weeks) and review sentiment (100% vs 77%). greenApes's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, ratings volume and device support there is nothing between them.

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

Zero CO2 holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 4 respectively. Written reviews point the same way: 77% of greenApes's written reviews are positive against 100% of Zero CO2's.

greenApes ships an update every 2 weeks, Zero CO2 every 3 days. The most recent releases landed on October 1, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | greenApes | Zero CO2 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (2 ratings)](https://appshunter.io/ios/app/greenapes/id597932602/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/zero-co2-get-climate-neutral/id1534365588/reviews)** |
| Number of ratings | 2 | **4** |
| Positive reviews | 77.3% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 37 MB | 40 MB |
| Requires iOS | 18.0 | **15.5** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [greenApes](https://appshunter.io/developer/597932605) | [Caramba App Development](https://appshunter.io/developer/349530108) |

## What reviewers say

### greenApes

[App page](https://appshunter.io/ios/app/greenapes/id597932602)

Earn digital currency by performing sustainable actions and completing challenges. Use your earnings to support environmental and social initiatives, and unlock rewards. Connect with other apps to automatically track eco-friendly activities.

**Highlights:** Earn TWIN coins for sustainable actions, Support environmental and social initiatives, Unlock rewards and surprises, Connect with Apple Health to track activity, Complete fun challenges, Share stories and ideas

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is greenApes free?

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

### Is Zero CO2 free?

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

### Which has better reviews, greenApes or Zero CO2?

Zero CO2 is rated higher. greenApes averages 4.5 out of 5 from 2 ratings, while Zero CO2 averages 5.0 from 4 ratings.

### Do greenApes or Zero CO2 have ads?

Zero CO2 shows ads; greenApes does not.

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

greenApes ships an update every 2 weeks, and Zero CO2 every 3 days. Most recently, greenApes was updated on October 1, 2026 and Zero CO2 on September 30, 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.*