# carbonTracker vs ProtAct17

The clearest difference is update cadence: carbonTracker at every 2 months against ProtAct17's every 9 months. 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.

carbonTracker ships an update every 2 months, ProtAct17 every 9 months. The most recent releases landed on September 21, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | carbonTracker | ProtAct17 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 9 months |
| Size | 83 MB | 187 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BASF Digital Solutions GmbH](https://appshunter.io/developer/1482373796) | [KIDS interactive GmbH](https://appshunter.io/developer/731500021) |

## What reviewers say

### carbonTracker

[App page](https://appshunter.io/ios/app/carbontracker/id1586104781)

**Features:** macOS Compatibility

**In-app purchases:** none


### ProtAct17

[App page](https://appshunter.io/ios/app/protact17/id6446908812)

**In-app purchases:** none


## Frequently asked questions

### Is carbonTracker free?

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

### Is ProtAct17 free?

ProtAct17 is free to download, with no in-app purchases.

### Do carbonTracker or ProtAct17 have ads?

Neither carbonTracker nor ProtAct17 shows ads.

### Which is updated more often, carbonTracker or ProtAct17?

carbonTracker ships an update every 2 months, and ProtAct17 every 9 months. Most recently, carbonTracker was updated on September 21, 2026 and ProtAct17 on September 13, 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.*