# Anchor Sentry vs Galvanic Sailing

The clearest difference is price: Galvanic Sailing at Free against Anchor Sentry's $3.99. Galvanic Sailing also leads on update cadence (daily vs every 3 weeks). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Galvanic Sailing is free to download; Anchor Sentry costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Anchor Sentry ships an update every 3 weeks, Galvanic Sailing daily. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Anchor Sentry | Galvanic Sailing |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/anchor-sentry/id1422478182/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 73.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Daily** |
| Monetization | Paid | — |
| Size | 91 MB | 155 MB |
| Requires iOS | **15** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Michael Dieter Konz](https://appshunter.io/developer/1422478181) | [Galvanic Works S.L.](https://appshunter.io/developer/1874253171) |

## What reviewers say

### Anchor Sentry

[App page](https://appshunter.io/ios/app/anchor-sentry/id1422478182)

This app monitors your ship's position while anchored, alerting you if the anchor drags and the vessel moves outside a set perimeter. It offers advanced features like distance circles, prohibited zone alerts, and background operation for continuous monitoring.

**Highlights:** Anchor drag and perimeter breach alerts, Map display with Google Maps or Navionics, Prohibited zone setup with alerts, Background operation, Multi-device sync functionality, GPX track saving, Favorite anchoring place saving

**In-app purchases:** none


### Galvanic Sailing

[App page](https://appshunter.io/ios/app/galvanic-sailing/id6758662475)

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

**In-app purchases:** none


## Frequently asked questions

### Is Anchor Sentry free?

Anchor Sentry costs $3.99, with no in-app purchases.

### Is Galvanic Sailing free?

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

### Do Anchor Sentry or Galvanic Sailing have ads?

Neither Anchor Sentry nor Galvanic Sailing shows ads.

### Which is updated more often, Anchor Sentry or Galvanic Sailing?

Anchor Sentry ships an update every 3 weeks, and Galvanic Sailing daily. Most recently, Anchor Sentry was updated on October 29, 2026 and Galvanic Sailing on October 25, 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.*