Jellywatch vs W2O
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Jellywatch
This app serves as a global database for monitoring ocean conditions, focusing on jellyfish populations. It empowers citizen scientists to submit observations and photos, contributing to freely accessible data on blooms, red tides, and general marine environments. Species identification is also offered for submitted images.
- Ocean condition monitoring
- Jellyfish population tracking
- Citizen science reporting
- Global data submission
- Species identification
- Free data access
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Jellywatch is a database for monitoring ocean conditions, especially jellyfish populations. Citizen scientists are encouraged to submit reports from around the world. The data will be freely available to download or browse. Report jellyfish blooms, red tides, and even clean “normal” conditions you observe. If you submit a photo, we can identify the species for you as well.
W2O
Access a wealth of ocean-related content, including weekly radio episodes, blog posts on policy and action, and a digital magazine exploring ocean culture and solutions. Stay informed about initiatives and join a global community dedicated to ocean health and sustainability.
- Weekly radio episodes on ocean issues
- Blog on ocean policy and action
- Digital magazine on ocean culture
- Monthly newsletter updates
- Global community for ocean conservation
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The World Ocean Observatory app brings the major programs and features of the W2O to your mobile device. - Listen to weekly episodes of WORLD OCEAN RADIO, our 5-minute audio feature on a wide range of ocean issues from science and education to advocacy and exemplary projects, brought to you by long-time host Peter Neill. - Read the latest from WORLD OCEAN FORUM, our blog dedicated to proposals for change in ocean policy and action worldwide, linking unexpected people with unexpected ideas and offering a knowledgeable outlet for research, opinion and storytelling. - Read WORLD OCEAN JOURNAL, a digital magazine on ocean culture and solutions to today’s ocean issues. Each volume, focused on a particular theme, includes essays, articles, interviews, art, exhibits, and performances profiling the vital impacts of the ocean on our lives. - Read our monthly newsletter to stay engaged with our making waves initiatives. ABOUT THE W2O World Ocean Observatory is a leading organization advocating for the health and sustainability of the ocean through an accessible worldwide network of communication. Through education, partnership, information exchange, public connection, and relentless communications, W2O is committed to building an expansive global community of Citizens of the Ocean to promote and conserve marine resources for the future of all mankind.
Screenshots
Verdict
The clearest difference is update cadence: Jellywatch at every 3 months against W2O's every 24 months. W2O's advantage is review sentiment (100% vs 91%) and ratings volume (3 vs 1). On price, rating, 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.
On the App Store both sit at effectively the same score — 5.0 for Jellywatch against 5.0 for W2O. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews are what separate them: 91% of Jellywatch's written reviews are positive against 100% of W2O's.
Jellywatch ships an update every 3 months, W2O every 24 months. The most recent releases landed on October 5, 2026 and September 20, 2026 respectively.
| Parameter | Jellywatch | W2O |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (3 ratings) |
| Positive reviews | 90.9% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 3 months — better | Every 24 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 14.0 — better | 14.1 |
| Further details — not scored | ||
| Size | 6 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Monterey Bay Aquarium Research Institute | Bjorn Grigholm |
Customer experience
Jellywatch
W2O
In-app purchases
Jellywatch
No in-app purchases
W2O
No in-app purchases
