# Open Sea OpenSeaMap Browser vs WWF Nautical Chart

The clearest difference is review sentiment: WWF Nautical Chart at 100% against Open Sea OpenSeaMap Browser's 29%. WWF Nautical Chart also leads on update cadence (every 6 months vs every 102 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Open Sea OpenSeaMap Browser ships an update every 102 months, WWF Nautical Chart every 6 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Open Sea OpenSeaMap Browser | WWF Nautical Chart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.2 (5 ratings)](https://appshunter.io/ios/app/open-sea-openseamap-browser/id1028248846/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 28.6% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 102 months | **Every 6 months** |
| Monetization | Free | Free |
| Size | 1 MB | 263 MB |
| Requires iOS | 15.5 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mobile Geographics](https://appshunter.io/developer/286844996) | [WWF Deutschland](https://appshunter.io/developer/579576854) |

## What reviewers say

### Open Sea OpenSeaMap Browser

[App page](https://appshunter.io/ios/app/open-sea-openseamap-browser/id1028248846)

This app provides access to nautical chart data and map image tiles generated by a collaborative open-source mapping project. It serves as a browser for freely usable marine navigation information.

**Highlights:** Nautical chart data access, Map image tile generation, Open-source mapping project browser, Freely usable marine navigation info

**Features:** Vision Pro support

**In-app purchases:** none


### WWF Nautical Chart

[App page](https://appshunter.io/ios/app/wwf-nautical-chart/id1536633469)

This app helps users navigate Wismar Bay and the Bay of Greifswald, highlighting sensitive areas and boating rules within Natura 2000 zones. It provides information on protected areas, fishing regulations, and bird species to promote harmonious coexistence between people and nature.

**Highlights:** Pinpoint location in Wismar Bay and Greifswald Bay, Shows sensitive areas and boating rules, Identifies protected Natura 2000 areas, Provides information on nature and regulations, Includes fishing and bird information, Routing function with waypoints

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Open Sea OpenSeaMap Browser free?

Open Sea OpenSeaMap Browser is free to download, with no in-app purchases.

### Is WWF Nautical Chart free?

WWF Nautical Chart is free to download, with no in-app purchases.

### Do Open Sea OpenSeaMap Browser or WWF Nautical Chart have ads?

Neither Open Sea OpenSeaMap Browser nor WWF Nautical Chart shows ads.

### Which is updated more often, Open Sea OpenSeaMap Browser or WWF Nautical Chart?

Open Sea OpenSeaMap Browser ships an update every 102 months, and WWF Nautical Chart every 6 months. Most recently, Open Sea OpenSeaMap Browser was updated on November 1, 2026 and WWF Nautical Chart on November 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*