# GhostNetZero vs Claud CO2

The clearest difference is in-app purchases: GhostNetZero at none against Claud CO2's 7. GhostNetZero also leads on iOS requirement (14.0 vs 18.5). Claud CO2's advantage is update cadence (every 2 days vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Claud CO2 sells 7 in-app purchases, starting at $1.99 per month. GhostNetZero asks for nothing beyond the download.

GhostNetZero ships an update every 4 months, Claud CO2 every 2 days. The most recent releases landed on September 12, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | GhostNetZero | Claud CO2 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 days** |
| Size | 69 MB | 3 MB |
| Requires iOS | **14.0** | 18.5 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [WWF Deutschland](https://appshunter.io/developer/579576854) | [Giuseppe Pio Cosenza](https://appshunter.io/developer/1774193971) |

## What reviewers say

### GhostNetZero

[App page](https://appshunter.io/ios/app/ghostnetzero/id1636278213)

**In-app purchases:** none


### Claud CO2

[App page](https://appshunter.io/ios/app/claud-co2/id6748361581)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Claud+ | $1.99 | per month |
| Claud+ Family | $3.99 | per month |
| Claud+ | $4.99 | per 7 days |
| Claud+ | $19.99 | per year |
| Claud+ Family | $39.99 | per year |
| Claud CO2 Lifetime | $34.99 | one-time |
| Claud CO2 Family Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is GhostNetZero free?

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

### Is Claud CO2 free?

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

### Do GhostNetZero or Claud CO2 have ads?

Neither GhostNetZero nor Claud CO2 shows ads.

### Which is updated more often, GhostNetZero or Claud CO2?

GhostNetZero ships an update every 4 months, and Claud CO2 every 2 days. Most recently, GhostNetZero was updated on September 12, 2026 and Claud CO2 on September 9, 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.*