# EyeOnWater vs Mini Secchi

EyeOnWater and Mini Secchi are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

EyeOnWater ships an update every 2 months, Mini Secchi every 5 weeks. The most recent releases landed on October 11, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | EyeOnWater | Mini Secchi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (2 ratings)](https://appshunter.io/ios/app/eyeonwater-colour/id1021542366/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | Free | — |
| Size | 31 MB | 22 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [MARIS B.V.](https://appshunter.io/developer/964066073) | [DDQ](https://appshunter.io/developer/418328467) |

## What reviewers say

### 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


### Mini Secchi

[App page](https://appshunter.io/ios/app/mini-secchi/id1587116779)

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

**In-app purchases:** none


## Frequently asked questions

### Is EyeOnWater free?

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

### Is Mini Secchi free?

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

### Do EyeOnWater or Mini Secchi have ads?

Neither EyeOnWater nor Mini Secchi shows ads.

### Which is updated more often, EyeOnWater or Mini Secchi?

EyeOnWater ships an update every 2 months, and Mini Secchi every 5 weeks. Most recently, EyeOnWater was updated on October 11, 2026 and Mini Secchi on October 30, 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.*