# Postboxes vs iStreams Channel Islands

The clearest difference is in-app purchases: Postboxes at none against iStreams Channel Islands's 7. Postboxes also leads on update cadence (every 5 weeks vs every 3 months) and iOS requirement (13.0 vs 18.2). iStreams Channel Islands's advantage is ads (none vs shown). On price, review sentiment, monetization model and device support there is nothing between them.

Both are free to download. iStreams Channel Islands sells 7 one-off in-app purchases. Postboxes asks for nothing beyond the download.

Postboxes ships an update every 5 weeks, iStreams Channel Islands every 3 months. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Postboxes | iStreams Channel Islands |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/postboxes/id403838645/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 44.0% of reviews | **50.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 5 weeks** | Every 3 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 141 MB | 56 MB |
| Requires iOS | **13.0** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Software101](https://appshunter.io/developer/381972019) | [Navtech Software](https://appshunter.io/developer/355517263) |

## What reviewers say

### Postboxes

[App page](https://appshunter.io/ios/app/postboxes/id403838645)

Locate nearby postboxes and post offices across the UK using your phone's GPS. The app utilizes OpenStreetMap data and allows users to contribute updates for missing or incorrect information. Filter results to see only postboxes, post offices, or both.

**Highlights:** Locate nearby postboxes and post offices, Uses GPS for accurate positioning, Leverages OpenStreetMap data, Allows user contributions for data updates, Filter by postboxes, post offices, or both, Map clustering for better visualization

**Features:** Vision Pro support

**In-app purchases:** none


### iStreams Channel Islands

[App page](https://appshunter.io/ios/app/istreams-channel-islands/id1223503159)

This app provides real-time Channel Islands tidal stream data, functioning offline. It offers tools for measuring tide set and rate, and calculating Course to Steer. Plan your voyages with hourly charts and precise navigational information.

**Highlights:** Hourly tidal stream atlas, Offline functionality, Tide set and rate measurement, Course to Steer calculation, Local and UTC time options, Boat position display on chart, Zoomable charts

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Set tool | $1.99 | one-time |
| Dover Tides 2018 | $2.99 | one-time |
| Dover 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 Postboxes free?

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

### Is iStreams Channel Islands free?

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

### Do Postboxes or iStreams Channel Islands have ads?

Postboxes shows ads; iStreams Channel Islands does not.

### Which is updated more often, Postboxes or iStreams Channel Islands?

Postboxes ships an update every 5 weeks, and iStreams Channel Islands every 3 months. Most recently, Postboxes was updated on October 28, 2026 and iStreams Channel Islands 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.*