# 2zero Climathon vs BrianApp

The clearest difference is update cadence: 2zero Climathon at every 2 weeks against BrianApp's every 17 months. 2zero Climathon also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, 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.

2zero Climathon ships an update every 2 weeks, BrianApp every 17 months. The most recent releases landed on October 5, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | 2zero Climathon | BrianApp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/2zero-climathon/id1458584431/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 47.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 17 months |
| Monetization | Free | — |
| Size | 89 MB | 2 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [2zero GmbH](https://appshunter.io/developer/1624455527) | [James Attersley](https://appshunter.io/developer/1708969739) |

## What reviewers say

### 2zero Climathon

[App page](https://appshunter.io/ios/app/2zero-climathon/id1458584431)

This app helps you actively reduce your carbon footprint through a CO2 calculator and various challenges. Join communities or Klimathons to compete and earn rewards for your climate protection efforts. It's designed for a CO2-neutral future.

**Highlights:** CO2 calculator, Climate challenges, Sustainability rewards, Team competitions, News and tips, Community participation

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

**In-app purchases:** none


### BrianApp

[App page](https://appshunter.io/ios/app/brianapp/id6470937176)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 2zero Climathon free?

2zero Climathon is free to download, with no in-app purchases.

### Is BrianApp free?

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

### Do 2zero Climathon or BrianApp have ads?

Neither 2zero Climathon nor BrianApp shows ads.

### Which is updated more often, 2zero Climathon or BrianApp?

2zero Climathon ships an update every 2 weeks, and BrianApp every 17 months. Most recently, 2zero Climathon was updated on October 5, 2026 and BrianApp on October 8, 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.*