# SEAiq vs app4sail

The clearest difference is price: SEAiq at Free against app4sail's $4.99. SEAiq also leads on update cadence (every 3 weeks vs every 3 months). app4sail's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.

SEAiq is free to download; app4sail costs $4.99 up front. SEAiq sells 2 in-app purchases, starting at $15.00 per year. app4sail asks for nothing beyond the download.

SEAiq ships an update every 3 weeks, app4sail every 3 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | SEAiq | app4sail |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.7 (194 ratings)](https://appshunter.io/ios/app/seaiq/id529514298/reviews)** | — |
| Number of ratings | **194** | — |
| Positive reviews | 61.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Free with in-app purchases | — |
| Size | 54 MB | 8 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sakhalin](https://appshunter.io/developer/517213477) | [anton van oosten](https://appshunter.io/developer/641322651) |

## What reviewers say

### 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


### app4sail

[App page](https://appshunter.io/ios/app/app4sail/id641578574)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SEAiq free?

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

### Is app4sail free?

app4sail costs $4.99, with no in-app purchases.

### Do SEAiq or app4sail have ads?

Neither SEAiq nor app4sail shows ads.

### Which is updated more often, SEAiq or app4sail?

SEAiq ships an update every 3 weeks, and app4sail every 3 months. Most recently, SEAiq was updated on October 23, 2026 and app4sail on October 24, 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.*