# Net Zero Challenge vs Footprint Challenge

The clearest difference is iOS requirement: Footprint Challenge at 11.4 against Net Zero Challenge's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on August 4, 2026 and December 21, 2025 respectively.

## The numbers

| Metric | Net Zero Challenge | Footprint Challenge |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 55 MB | 44 MB |
| Requires iOS | 15.1 | **11.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Green Rewards Ltd](https://appshunter.io/developer/909021443) | [E-vontuur](https://appshunter.io/developer/1589927962) |

## What reviewers say

### Net Zero Challenge

[App page](https://appshunter.io/ios/app/net-zero-challenge/id1541830052)

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

**In-app purchases:** none


### Footprint Challenge

[App page](https://appshunter.io/ios/app/footprint-challenge/id1643148300)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Net Zero Challenge free?

Net Zero Challenge is free to download, with no in-app purchases.

### Is Footprint Challenge free?

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

### Do Net Zero Challenge or Footprint Challenge have ads?

Neither Net Zero Challenge nor Footprint Challenge shows ads.

### Which is updated more often, Net Zero Challenge or Footprint Challenge?

Net Zero Challenge ships an update every 2 months, and Footprint Challenge every 2 months. Most recently, Net Zero Challenge was updated on August 4, 2026 and Footprint Challenge on December 21, 2025.

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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.*