# Zayed Green Challenge vs Tummyfish

The clearest difference is rating: Zayed Green Challenge at 4.5 against Tummyfish's 3.8. Tummyfish's advantage is ratings volume (8 vs 2). 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.

Zayed Green Challenge holds the better App Store score, 4.5 against 3.8. Both are backed by a comparable volume of ratings — 2 and 8 respectively.

Zayed Green Challenge ships an update every 2 months, Tummyfish every 3 months. The most recent releases landed on October 8, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Zayed Green Challenge | Tummyfish |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/zayed-green-challenge/id1013437617/reviews)** | [3.8 (8 ratings)](https://appshunter.io/ios/app/tummyfish/id1139166275/reviews) |
| Number of ratings | 2 | **8** |
| Positive reviews | — | 85.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free | Free |
| Size | 46 MB | 274 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SHEIKH ZAYED INTERNATIONAL PRIZE FOR THE ENVIRONMENT EST.](https://appshunter.io/developer/1303382587) | [Nestlé](https://appshunter.io/developer/451455699) |

## What reviewers say

### Zayed Green Challenge

[App page](https://appshunter.io/ios/app/zayed-green-challenge/id1013437617)

This application aims to raise environmental awareness by promoting sustainable development goals. It was founded by the Zayed International Foundation for the Environment to recognize and encourage environmental achievements.

**Highlights:** Environmental awareness, Sustainable development goals, Promotes environmental achievements, Founded by Zayed International Foundation

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

**In-app purchases:** none


### Tummyfish

[App page](https://appshunter.io/ios/app/tummyfish/id1139166275)

This virtual friend encourages children to drink more water through interactive games and rewards. Parents can set reminders and track progress, while kids engage with their virtual companion in a lively environment.

**Highlights:** Virtual friend to encourage water intake, Interactive games and rewards, Parental notifications for hydration, Track water consumption statistics, Learn benefits of drinking water, Unlock toys and mini-games

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Zayed Green Challenge free?

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

### Is Tummyfish free?

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

### Which has better reviews, Zayed Green Challenge or Tummyfish?

Zayed Green Challenge is rated higher. Zayed Green Challenge averages 4.5 out of 5 from 2 ratings, while Tummyfish averages 3.8 from 8 ratings.

### Do Zayed Green Challenge or Tummyfish have ads?

Neither Zayed Green Challenge nor Tummyfish shows ads.

### Which is updated more often, Zayed Green Challenge or Tummyfish?

Zayed Green Challenge ships an update every 2 months, and Tummyfish every 3 months. Most recently, Zayed Green Challenge was updated on October 8, 2026 and Tummyfish on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*