# ASM Vessel Tracker vs ISN Observer App

The clearest difference is iOS requirement: ASM Vessel Tracker at 9.0 against ISN Observer App's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ASM Vessel Tracker ships an update monthly, ISN Observer App every 3 weeks. The most recent releases landed on October 3, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | ASM Vessel Tracker | ISN Observer App |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Size | 33 MB | 152 MB |
| Requires iOS | **9.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [MariApps Marine Solutions Pvt. Ltd.](https://appshunter.io/developer/1040404561) | [Aleut Community of St. Paul Island Tribal Government](https://appshunter.io/developer/1329178887) |

## What reviewers say

### ASM Vessel Tracker

[App page](https://appshunter.io/ios/app/asm-vessel-tracker/id1254326853)

**In-app purchases:** none


### ISN Observer App

[App page](https://appshunter.io/ios/app/isn-observer-app/id6502642318)

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

**In-app purchases:** none


## Frequently asked questions

### Is ASM Vessel Tracker free?

ASM Vessel Tracker is free to download, with no in-app purchases.

### Is ISN Observer App free?

ISN Observer App is free to download, with no in-app purchases.

### Do ASM Vessel Tracker or ISN Observer App have ads?

Neither ASM Vessel Tracker nor ISN Observer App shows ads.

### Which is updated more often, ASM Vessel Tracker or ISN Observer App?

ASM Vessel Tracker ships an update monthly, and ISN Observer App every 3 weeks. Most recently, ASM Vessel Tracker was updated on October 3, 2026 and ISN Observer App 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.*