# OpenSeaMap vs SeaBase

The clearest difference is rating: SeaBase at 5.0 against OpenSeaMap's 1.0. SeaBase also leads on in-app purchases (none vs 1) and update cadence (every 6 days vs every 2 months). On price, ratings volume, ads and device support there is nothing between them.

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

SeaBase holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

OpenSeaMap ships an update every 2 months, SeaBase every 6 days. The most recent releases landed on October 21, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | OpenSeaMap | SeaBase |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/openseamap/id495210783/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/seabase/id6786122931/reviews)** |
| Number of ratings | 1 | **2** |
| Positive reviews | 38.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 days** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 13 MB | 80 MB |
| Requires iOS | 18.6 | **16.6** |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [appdoctors UG](https://appshunter.io/developer/961029450) | [Yeoman Ventures LLC](https://appshunter.io/developer/6785116999) |

## 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 |


### SeaBase

[App page](https://appshunter.io/ios/app/seabase/id6786122931)

This offline-first sailing companion provides essential tools for life on the water. It includes an anchor alarm, nautical charts, GPS navigation, tide information, and a logbook, all functioning without a cellular signal. Enjoy a comprehensive suite of features with a single, one-time purchase.

**Highlights:** Offline nautical charts, Anchor alarm with drift detection, GPS navigation and route planning, Offline tide predictions, Harbor and anchorage finder, Auto-tracking logbook, Reference guides and emergency tools

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is OpenSeaMap free?

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

### Is SeaBase free?

SeaBase is free to download, with no in-app purchases.

### Which has better reviews, OpenSeaMap or SeaBase?

SeaBase is rated higher. OpenSeaMap averages 1.0 out of 5 from 1 ratings, while SeaBase averages 5.0 from 2 ratings.

### Do OpenSeaMap or SeaBase have ads?

Neither OpenSeaMap nor SeaBase shows ads.

### Which is updated more often, OpenSeaMap or SeaBase?

OpenSeaMap ships an update every 2 months, and SeaBase every 6 days. Most recently, OpenSeaMap was updated on October 21, 2026 and SeaBase on September 30, 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.*