# CH16 vs TradeOnSea

The clearest difference is in-app purchases: TradeOnSea at none against CH16's 2. TradeOnSea also leads on ads (none vs shown) and update cadence (every 11 days vs every 2 months). CH16's advantage is iOS requirement (13.0 vs 15.1). On price and device support there is nothing between them.

Both are free to download. CH16 sells 2 in-app purchases, starting at $0.99 per month. TradeOnSea asks for nothing beyond the download.

CH16 ships an update every 2 months, TradeOnSea every 11 days. The most recent releases landed on October 2, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | CH16 | TradeOnSea |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 11 days** |
| Monetization | Free with in-app purchases | — |
| Size | 80 MB | 100 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Global SAR Hub](https://appshunter.io/developer/1888797457) | [JEROME LABARTHE](https://appshunter.io/developer/6778753926) |

## What reviewers say

### CH16

[App page](https://appshunter.io/ios/app/ch16/id6761360179)

This maritime safety app provides instant access to global rescue coordination centers and features tools for generating distress messages and planning voyages. It offers real-time location tracking for man overboard situations and works offline, ensuring safety at sea.

**Highlights:** Global maritime rescue center directory, Interactive SRR zone map, GMDSS-compliant distress message generator, Man Overboard (MOB) mode with GPS tracking, Passage Plan for voyage declaration, Offline functionality, Multilingual support

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CH16 Pro | $0.99 | per month |
| CH16 Pro Lifetime | $4.99 | one-time |


### TradeOnSea

[App page](https://appshunter.io/ios/app/tradeonsea/id6778753924)

**In-app purchases:** none


## Frequently asked questions

### Is CH16 free?

CH16 is free to download, with in-app purchases available.

### Is TradeOnSea free?

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

### Do CH16 or TradeOnSea have ads?

CH16 shows ads; TradeOnSea does not.

### Which is updated more often, CH16 or TradeOnSea?

CH16 ships an update every 2 months, and TradeOnSea every 11 days. Most recently, CH16 was updated on October 2, 2026 and TradeOnSea on October 14, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*