# Phyto vs EyeOnWater

The clearest difference is rating: Phyto at 4.8 against EyeOnWater's 2.5. Phyto also leads on ratings volume (6 vs 2). EyeOnWater's advantage is update cadence (every 2 months vs every 10 months). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Phyto holds the better App Store score, 4.8 against 2.5. Both are backed by a comparable volume of ratings — 6 and 2 respectively.

Phyto ships an update every 10 months, EyeOnWater every 2 months. The most recent releases landed on October 31, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Phyto | EyeOnWater |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (6 ratings)](https://appshunter.io/ios/app/phyto/id333237649/reviews)** | [2.5 (2 ratings)](https://appshunter.io/ios/app/eyeonwater-colour/id1021542366/reviews) |
| Number of ratings | **6** | 2 |
| Positive reviews | 64.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 81 MB | 31 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gano Technologies LLC](https://appshunter.io/developer/333237652) | [MARIS B.V.](https://appshunter.io/developer/964066073) |

## What reviewers say

### Phyto

[App page](https://appshunter.io/ios/app/phyto/id333237649)

Learn to identify common marine and freshwater phytoplankton with this educational app. It features a comprehensive identification guide, flashcards, and interactive games to aid learning. Developed with support from NOAA, it's designed for both iPhone and iPad.

**Highlights:** Phytoplankton identification guide, Marine and freshwater species, Flash cards for learning, Interactive identification games, Species details and photos, Submit observation results

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

**In-app purchases:** none


### EyeOnWater

[App page](https://appshunter.io/ios/app/eyeonwater-colour/id1021542366)

Contribute to scientific research by measuring and reporting the color of nearby bodies of water. Your data helps scientists track water quality and life within it over time, building on a long-standing scientific observation method.

**Highlights:** Measure water color, Contribute to scientific research, Track water quality, Observe algae presence, Utilize Forel-Ule scale, View data on website

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

**In-app purchases:** none


## Frequently asked questions

### Is Phyto free?

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

### Is EyeOnWater free?

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

### Which has better reviews, Phyto or EyeOnWater?

Phyto is rated higher. Phyto averages 4.8 out of 5 from 6 ratings, while EyeOnWater averages 2.5 from 2 ratings.

### Do Phyto or EyeOnWater have ads?

Neither Phyto nor EyeOnWater shows ads.

### Which is updated more often, Phyto or EyeOnWater?

Phyto ships an update every 10 months, and EyeOnWater every 2 months. Most recently, Phyto was updated on October 31, 2026 and EyeOnWater on November 1, 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.*