Marine Ranger vs COSEA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Marine Ranger
Read full descriptionHide full description
BECOME A MARINE RANGER! Share your findings with others, learn more about the marine environment and the interaction of marine mammals with fishermen and boaters. Contribute to the scientific research and conservation efforts of the Mediterranean sea. LEARN ABOUT MARINE MAMMALS The Mediterranean is home to 12 and and an occasional destination to 17 more marine mammal species. Become an expert at recognising them at sea, learn how to identify their different behaviours and how you should behave to make the most of the encounter without disturbing the animals. CONTRIBUTE TO SCIENTIFIC RESEARCH There are only so many marine biologists and researchers in the Mediterranean sea, with only so many boats. With your help, and the help of your friends you invite to download this app, you can contribute significantly to better understanding of the Mediterranean sea, the whales, dolphins and other animals who inhabit it.
COSEA
Document marine environments, coastal habitats, and species. Report on pollution, infrastructure, and the blue economy. Contribute data and photos to a collaborative map to help scientists understand marine factors and foster a healthy relationship between humans and the sea.
- Observe marine environments
- Document coastal habitats and species
- Report on pollution and infrastructure
- Add photos and data to a collaborative map
- Interact with the user community
- Build an environment notebook
Read full descriptionHide full description
With COSEA you can observe your marine environment, document coastal habitats or species, do activities, and report on pollution, infrastructure, and the blue economy. COSEA is a collaborative, participatory, and community-driven project. With your contributions on the map and your activity in the app, you help scientists better understand the impacts and drivers of marine factors to protect and foster healthy relationship between humans and our seas. What can you do? In COSEA you can add your photos and data, aka "Spots, on the map. By submitting your observations and documentation, you can build up an environment notebook in your user profile and map your area. You can also interact, comment, and exchange with others in the user community, or simply respond to the contribution of a friend in the app with a heart & like. We all share a deep care for our seas and their resilience in changing times. With COSEA you can help strengthen a healthy relationship between humans and our oceans and learn more about marine protection, social impacts and sustainable use of natural resources. Open Project COSEA is an open project. We invite actors, stakeholders, environment groups, associations, youth projects, and others to co-use the COSEA App for observations, data collection, and community building. During the course of the projects, we will build innovative tools for you to enable independent and self-governed usage of COSEA for your marine and coastal activities. The COSEA App is running on the SPOTTERON Citizen Science Platform at www.spotteron.net
Screenshots
Verdict
The clearest difference is device support: COSEA at 3 against Marine Ranger's 1. COSEA also leads on iOS requirement (12.0 vs 16.0). On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Marine Ranger ships an update every 2 months, COSEA every 5 weeks. The most recent releases landed on October 25, 2026 and October 7, 2026 respectively.
| Parameter | Marine Ranger | COSEA |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 62 MB | 206 MB |
| Age rating | 4+ | 4+ |
| Developer | Blue World Institute | SPOTTERON Gmbh |
In-app purchases
Marine Ranger
No in-app purchases
COSEA
No in-app purchases








