# SeaNav NP vs iStreams Solent

The clearest difference is price: iStreams Solent at Free against SeaNav NP's $27.99. iStreams Solent also leads on update cadence (every 3 months vs every 7 months). SeaNav NP's advantage is device support (4 vs 2) and iOS requirement (11.0 vs 18.2). On ads, in-app purchases and monetization model there is nothing between them.

iStreams Solent is free to download; SeaNav NP costs $27.99 up front. SeaNav NP sells 10 in-app purchases, starting at $5.49 per year and iStreams Solent sells 6 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

SeaNav NP ships an update every 7 months, iStreams Solent every 3 months. The most recent releases landed on October 24, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | SeaNav NP | iStreams Solent |
| --- | --- | --- |
| Price | $27.99 | **Free** |
| Rating | **[2.7 (3 ratings)](https://appshunter.io/ios/app/seanav-np/id1209754367/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 months** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 63 MB | 38 MB |
| Requires iOS | **11.0** | 18.2 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Pocket Mariner Ltd.](https://appshunter.io/developer/719592131) | [Navtech Software](https://appshunter.io/developer/355517263) |

## What reviewers say

### SeaNav NP

[App page](https://appshunter.io/ios/app/seanav-np/id1209754367)

This app offers real-time maritime navigation with high-resolution digital charts and powerful route planning. It includes free navigation tools, offline chart support, and weather information. Advanced features like live AIS and augmented reality views are available via in-app purchases.

**Highlights:** Real-time navigation, High-resolution digital charts, Route planning and tracking, Offline chart support, Live AIS and AR views (IAP), Weather, tide, and sun/moon times, Apple Watch app

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Wind and Waves | $5.49 | per year |
| Pro Features | $14.49 | per year |
| New Zealand Charts | $16.99 | per year |
| Portuguese Charts | $19.99 | per year |
| US & Great Lakes | $24.99 | per year |
| Norwegian Charts | $24.99 | per year |
| UK & IE Charts | $25.99 | per year |
| Spanish Charts | $26.99 | per year |
| French Charts (N & W) | $29.99 | per year |
| Canadian Charts | $30.99 | per year |


### iStreams Solent

[App page](https://appshunter.io/ios/app/istreams-solent/id1454510704)

This app provides real-time Solent tidal stream data, displaying hourly charts and tools to measure tide set and interpolated rates. It functions offline and allows for future planning by selecting different dates.

**Highlights:** Real-time Solent tidal stream charts, Offline functionality, Tide set and rate measurement tools, Automatic Portsmouth HW time selection, Date selection for future planning, Zoomable charts, Boat position display on chart

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock 'Set' tool | $1.99 | one-time |
| Portsmouth Tides 2019 | $2.99 | one-time |
| 6 Month Subscription | $2.99 | one-time |
| 1 Month Subscription | $2.99 | one-time |
| Unlock CTS tool | $3.99 | one-time |
| 1 Year Subscription | $5.99 | one-time |


## Frequently asked questions

### Is SeaNav NP free?

SeaNav NP costs $27.99, and also offers in-app purchases.

### Is iStreams Solent free?

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

### Do SeaNav NP or iStreams Solent have ads?

Neither SeaNav NP nor iStreams Solent shows ads.

### Which is updated more often, SeaNav NP or iStreams Solent?

SeaNav NP ships an update every 7 months, and iStreams Solent every 3 months. Most recently, SeaNav NP was updated on October 24, 2026 and iStreams Solent 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.*