# OpenSeaMap vs SEAiq

The clearest difference is rating: SEAiq at 4.7 against OpenSeaMap's 1.0. SEAiq also leads on ratings volume (194 vs 1) and review sentiment (61% vs 38%). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. OpenSeaMap sells 1 one-off in-app purchase and SEAiq sells 2 in-app purchases, starting at $15.00 per year. Whichever you choose, the download price is not the number that matters.

SEAiq holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: SEAiq has 194 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 38% of OpenSeaMap's written reviews are positive against 61% of SEAiq's.

OpenSeaMap ships an update every 2 months, SEAiq every 3 weeks. The most recent releases landed on October 21, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | OpenSeaMap | SEAiq |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/openseamap/id495210783/reviews) | **[4.7 (194 ratings)](https://appshunter.io/ios/app/seaiq/id529514298/reviews)** |
| Number of ratings | 1 | **194** |
| Positive reviews | 38.3% of reviews | **61.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 13 MB | 54 MB |
| Requires iOS | 18.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [appdoctors UG](https://appshunter.io/developer/961029450) | [Sakhalin](https://appshunter.io/developer/517213477) |

## 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 |


### SEAiq

[App page](https://appshunter.io/ios/app/seaiq/id529514298)

This marine navigation app offers comprehensive charting capabilities, allowing users to load various standard chart formats and download NOAA charts. It includes essential navigation tools like waypoints, routes, and an anchor alarm, along with weather overlays and NMEA/AIS integration.

**Highlights:** Load custom S-57, S-63, iENC, BSB, KAP charts, Automatic NOAA chart downloads, Waypoints, routes, and tracks, Anchor alarm, Automatic weather downloads, NMEA and AIS integration

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Annual | $15.00 | per year |
| Upgrade for Premium Features | $49.99 | one-time |

**What reviewers like**

- 👍 Highly reliable navigation app
- 💡 Tons of features
- ✨ Clean and sensical interface
- 🚀 Versatile for plotting routes/waypoints
- 📊 Estimating AIS target crossing range

**What reviewers complain about**

- 😩 Tedious to plot a course
- 🔧 Complicated chart setup initially
- 🤔 Not user friendly
- 📚 Instructions not very helpful
- ⏳ Time wasted on simple things

**Reported bugs**

- No access to premium features after payment
- Chart downloads fail if app is not on screen
- App freezes when trying to delete
- App crashes

**Requested features**

- Simplify course plotting
- Add support for .MBTiles
- Add VMG feature
- Add support for .MBTiles
- Add support for .MBTiles


## Frequently asked questions

### Is OpenSeaMap free?

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

### Is SEAiq free?

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

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

SEAiq is rated higher. OpenSeaMap averages 1.0 out of 5 from 1 ratings, while SEAiq averages 4.7 from 194 ratings.

### Do OpenSeaMap or SEAiq have ads?

Neither OpenSeaMap nor SEAiq shows ads.

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

OpenSeaMap ships an update every 2 months, and SEAiq every 3 weeks. Most recently, OpenSeaMap was updated on October 21, 2026 and SEAiq on October 29, 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.*