# Secchi

> Secchi (iPhone/iPad app by The Secchi Disk Foundation.)

- Source: https://appshunter.io/ios/app/secchi/id1524837284 (this page in markdown: same URL + `.md`)
- Developer: [The Secchi Disk Foundation](https://appshunter.io/developer/1487320010)
- Category: Education
- Price: Free
- Age rating: 4+
- Requires: iOS 15.6 · 45 MB
- Languages: English
- Released: 2020-07-29
- Data updated: 2026-05-31
- User reviews in markdown: https://appshunter.io/ios/app/secchi/id1524837284/reviews.md

## What is Secchi?

Climate change is threatening the phytoplankton that underpins the marine food chain. We must understand why before it's too late. Secchi enables you to take part in the Secchi Disk citizen science study and help collect essential data on the phytoplankton.


## Version history (last 5 releases)

### 1.6.0 — 2026-05-26

Internal improvements to prepare for iOS 27

### 1.5.8 — 2025-12-16

App compliance. Updated age ratings.

### 1.5.7 — 2024-07-29

- Improves image compression

### 1.5.6 — 2024-05-06

Fixes a bug that caused a crash when submitting data

### 1.5.5 — 2024-04-09

- Changed contact email address

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| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [PADI AWARE](https://appshunter.io/ios/app/padi-aware/id1260943783) | — | Free | Education |
| [iNaturalist](https://appshunter.io/ios/app/inaturalist/id6475737561) | 3.9 (495) | Free | Education |
| [Seek by iNaturalist](https://appshunter.io/ios/app/seek-by-inaturalist/id1353224144) | 4.8 (30,737) | Free | Education |
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| [Star Walk：Find Stars & Planets](https://appshunter.io/ios/app/star-walkfind-stars-and-planets/id295430577) | 4.7 (25,013) | Free | Education |
| [My Study Life - School Planner](https://appshunter.io/ios/app/my-study-life-school-planner/id910639339) | 4.5 (6,139) | Free | Education |

## Related topics

[mini secchi](https://appshunter.io/ios/topics/mini-secchi) · [plankton](https://appshunter.io/ios/topics/plankton)

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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 2026-05-31.*