# OpenSeaMap vs WWF Nautical Chart

The clearest difference is review sentiment: WWF Nautical Chart at 100% against OpenSeaMap's 38%. WWF Nautical Chart also leads on in-app purchases (none vs 1) and iOS requirement (14.0 vs 18.6). OpenSeaMap's advantage is update cadence (every 2 months vs every 6 months). On price, ads and device support there is nothing between them.

Both are free to download. OpenSeaMap sells 1 one-off in-app purchase. WWF Nautical Chart asks for nothing beyond the download.

OpenSeaMap ships an update every 2 months, WWF Nautical Chart every 6 months. Both last shipped on October 12, 2026.

## The numbers

| Metric | OpenSeaMap | WWF Nautical Chart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/openseamap/id495210783/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 38.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 13 MB | 263 MB |
| Requires iOS | 18.6 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [appdoctors UG](https://appshunter.io/developer/961029450) | [WWF Deutschland](https://appshunter.io/developer/579576854) |

## What reviewers say

### OpenSeaMap

[App page](https://appshunter.io/ios/app/openseamap/id495210783)

This app provides a free, worldwide nautical chart with detailed sea information, including lights, weather data, and harbor details. It offers chartplotting, waypoint management, and offline map caching for navigation. Users can mark locations, enter coordinates, and adjust chart zoom for optimal viewing.

**Highlights:** Free worldwide sea chart, Chartplotting with tracking, Waypoint creation and export, Offline map caching, Mark and search locations, Adjustable chart zoom

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OpenSeaMap Professional | $1.99 | one-time |


### 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 OpenSeaMap free?

OpenSeaMap is free to download, with in-app purchases available.

### Is WWF Nautical Chart free?

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

### Do OpenSeaMap or WWF Nautical Chart have ads?

Neither OpenSeaMap nor WWF Nautical Chart shows ads.

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

OpenSeaMap ships an update every 2 months, and WWF Nautical Chart every 6 months. Most recently, OpenSeaMap was updated on October 12, 2026 and WWF Nautical Chart on October 12, 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.*