Marnoba vs Global Alert
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Marnoba
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MARNOBA is a mobile application which allows citizens and entities to send information about marine litter that is being found on their coasts and seas. This app is designed as a field notebook, it avoid carrying paper during the monitoring and helps collecting, saving and sending the obtained information about it (categories, objects and quantities) to a online free viewer on the internet leaving access for any interested person (scientist, technicians or citizens).
Global Alert
Report trash hot-spots in waterways and coastlines to help combat plastic pollution. Your submissions aid community cleanup efforts and the placement of waste catchment devices, contributing to healthier oceans. Download public data for research and awareness campaigns.
- Map trash hot-spots with photos and data
- Connect with community cleanup organizations
- Download public trash data
- Contribute to ocean health initiatives
- Report plastic waste in rivers, lakes, and coastlines
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Be part of the solution! Help stop plastic pollution in our waters and ocean. Global Alert is a trash-reporting app that lets you map out trash hot-spots in our waterways, with a main focus on plastic waste in rivers, streams, lakes, and coastlines. The information you submit to the Global Alert map will help groups in your community to better decide where cleanups should take place, and where long-term catchment devices can be placed. Imagine rivers and streams to be like blood vessels that go to your heart, and your heart is the ocean. If we can stop plastic waste from “flowing through” our blood vessels, we will all be a lot healthier as a result. You can be part of this worldwide effort to remove plastic waste from our waters, resulting in all kinds of good news for our communities, and of course the ocean, which is downstream to everything. - Map trash sites on the public Global Alert map by uploading photos and data. - Make a difference. Connect with community steward organizations or cleanup teams anywhere you go. Even if you can’t help with a cleanup and just want to report trash hot-spots, your information is a huge help to other stakeholders who can help to make improvements once they know where those sites are! - Download public data. Use the map of trash hot-spots for science, school projects, raising awareness, or working with local governments to create cleaner waters. - Free to use, log in and start reporting! Officially endorsed by the World Bank’s Global Partnership for Oceans as the official trash hot-spot reporting app! Global Alert was developed through funding provided by the Global Partnership for Oceans (GPO), and under the strategic objectives of the Plastic Waste Management Program, as part of the GPO Pollution Component.
Screenshots
Verdict
The clearest difference is iOS requirement: Global Alert at 7.0 against Marnoba's 15.1. 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.
Marnoba ships an update every 6 weeks, Global Alert every 2 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.
| Parameter | Marnoba | Global Alert |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 6 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.1 | 7.0 — better |
| Further details — not scored | ||
| Size | 66 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | ASOC VERTIDOS CERO PARA LA PREVENCION MINIMIZACION Y ELIMINACION DE LOS VERTIDOS | Ocean Recovery Alliance Inc |
In-app purchases
Marnoba
No in-app purchases
Global Alert
No in-app purchases









