# EyeOnWater - Colour

> Citizen science app for measuring and reporting water color for scientific research. (iPhone/iPad app by Maris B.V..)

- Source: https://appshunter.io/ios/app/eyeonwater-colour/id1021542366 (this page in markdown: same URL + `.md`)
- Developer: [Maris B.V.](https://appshunter.io/developer/964066073)
- Category: Education
- Price: Free
- Rating: 2.50/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 14.0 · 29 MB
- Languages: English
- Released: 2015-09-03
- Data updated: 2026-06-25
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/eyeonwater-colour/id1021542366/reviews.md

## What is EyeOnWater?

The EyeOnWater concept consists of an App and a website. The app allows you as user to make a contribution to science and supply information about the water colour of fresh- as well as saline waters (lakes, rivers, coastal waters, seas and oceans) near your location or elsewhere. The measurement is sent to the central server, validated and stored, after which it is visible via the EyeOnWater website: www.eyeonwater.org 

What is it you measure? Water colour is an indication for life (e.g. algae) in the water. Scientists have been measuring this in marine waters via the Forel-Ule scale for more than 200 years. Your measurements will contribute to this long term observation and continue the timeseries.

The EyeOnWater concept has been developed by NIOZ (scientific background), Veerder (Design), and MARIS (Technical development), with assistance from other partners in the EU funded project Citclops: www.citclops.eu 

Join us!

## Key features

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


## Frequently asked questions about EyeOnWater

### What is EyeOnWater used for?

EyeOnWater is a citizen science app that allows users to measure and report the color of fresh and saline waters. This data contributes to long-term scientific observation of water quality and the presence of life like algae.

### How does EyeOnWater help science?

By measuring water color using the Forel-Ule scale, users contribute to a continuous timeseries of data that scientists have been collecting for over 200 years. This helps track changes in marine and freshwater ecosystems.

### What devices does EyeOnWater support?

EyeOnWater is available for iPhone, iPad, and iPod devices, making it accessible to a wide range of Apple users interested in contributing to environmental research.

### Is EyeOnWater free to use?

Yes, EyeOnWater is completely free to download and use. There are no in-app purchases or subscription fees required to contribute your water color measurements.

### What is the age rating for EyeOnWater?

EyeOnWater has an age rating of 4+, making it suitable for children and adults alike to participate in citizen science and learn about water environments.

### How often is EyeOnWater updated?

The latest version of EyeOnWater is 2.6.5, and it was last updated on May 20, 2026. This indicates a commitment to maintaining and improving the application.

### Where can I see the data collected by EyeOnWater?

All measurements submitted through the EyeOnWater app are sent to a central server, validated, and stored. This data then becomes visible on the official EyeOnWater website: www.eyeonwater.org.

### Does EyeOnWater have ads?

No, EyeOnWater does not contain advertisements. The app is designed to provide a seamless experience for users focused on contributing to scientific data collection.

## Version history (last 5 releases)

### 2.6.5 — 2026-05-20

Minor bugfixes and improvements

### 2.6.2 — 2025-06-17

Fixed a bug where the user couldn't start an observation if there was no internet connection present.

### 2.6.1 — 2024-06-04

General Maintenance: Addressed various bugs and improved system stability.
Implemented New Camera Module: Integrated advanced camera features for better image capture and processing.

### 2.5.8 — 2024-04-17

Added French language option
Added option to edit the measurement location before submitting

### 2.5.6 — 2024-03-18

Updated French translation & GIF's in "how to use app".

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## More apps by Maris B.V.

- [Wandelnetwerk Noord-Holland](https://appshunter.io/ios/app/wandelnetwerk-noord-holland/id964066074)
- [SeaMobile: Cyprus](https://appshunter.io/ios/app/seamobile-cyprus/id1001981401)
- [OGEL & TDM Law Journals](https://appshunter.io/ios/app/ogel-and-tdm-law-journals/id1322320911)
- [EyeOnWater - Australia](https://appshunter.io/ios/app/eyeonwater-australia/id1370964492)

All apps by Maris B.V.: https://appshunter.io/developer/964066073

## Related topics

[eyeonwater](https://appshunter.io/ios/topics/eyeonwater) · [eyes on water](https://appshunter.io/ios/topics/eyes-on-water) · [ieyeonwater](https://appshunter.io/ios/topics/ieyeonwater) · [see through water](https://appshunter.io/ios/topics/see-through-water)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-25.*