# Anchor Alarm vs CMSAP

The clearest difference is in-app purchases: CMSAP at none against Anchor Alarm's 1. CMSAP also leads on iOS requirement (11.0 vs 16.0). Anchor Alarm's advantage is update cadence (every 2 weeks vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Anchor Alarm sells 1 in-app purchase, starting at $2.99 per month. CMSAP asks for nothing beyond the download.

Anchor Alarm ships an update every 2 weeks, CMSAP every 3 months. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Anchor Alarm | CMSAP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (11 ratings)](https://appshunter.io/ios/app/anchor-alarm-boat-tracker/id6448241324/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 months |
| Monetization | Free | — |
| Size | 18 MB | 68 MB |
| Requires iOS | 16.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Serdar Percin](https://appshunter.io/developer/1143186597) | [Sailti](https://appshunter.io/developer/960712124) |

## What reviewers say

### Anchor Alarm

[App page](https://appshunter.io/ios/app/anchor-alarm-boat-tracker/id6448241324)

This app provides real-time updates on your anchor's location and sends instant notifications if it drifts beyond set parameters. It offers detailed stay analysis, location tracking, and a history of anchoring trips, all within a user-friendly interface.

**Highlights:** Real-time anchor location updates, Instant drift notifications, Customizable distance and time settings, Detailed anchor stay analysis, Location history tracking, Anchor trip history, User-friendly interface

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $2.99 | per month |


### CMSAP

[App page](https://appshunter.io/ios/app/cmsap/id6459410170)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Anchor Alarm free?

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

### Is CMSAP free?

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

### Do Anchor Alarm or CMSAP have ads?

Neither Anchor Alarm nor CMSAP shows ads.

### Which is updated more often, Anchor Alarm or CMSAP?

Anchor Alarm ships an update every 2 weeks, and CMSAP every 3 months. Most recently, Anchor Alarm was updated on October 24, 2026 and CMSAP on October 27, 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.*