# Anchor Pro vs Buoyancy Calc

The clearest difference is rating: Anchor Pro at 4.8 against Buoyancy Calc's 3.1. Anchor Pro also leads on review sentiment (79% vs 40%) and ratings volume (3.6K vs 25). Buoyancy Calc's advantage is in-app purchases (none vs 1) and iOS requirement (15.6 vs 17.2). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Anchor Pro sells 1 in-app purchase, starting at $6.99 per year. Buoyancy Calc asks for nothing beyond the download.

Anchor Pro holds the better App Store score, 4.8 against 3.1. That said, the two scores are not equally well evidenced: Anchor Pro has 3.6K ratings behind it against 25, so its average is the more settled of the two. Written reviews point the same way: 79% of Anchor Pro's written reviews are positive against 40% of Buoyancy Calc's.

Anchor Pro ships an update every 2 months, Buoyancy Calc every 3 months. The most recent releases landed on October 27, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Anchor Pro | Buoyancy Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (3.6K ratings)](https://appshunter.io/ios/app/anchor-pro/id1445476850/reviews)** | [3.1 (25 ratings)](https://appshunter.io/ios/app/buoyancy-calc/id1482332472/reviews) |
| Number of ratings | **3.6K** | 25 |
| Positive reviews | **79.0% of reviews** | 40.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 23 MB | 1 MB |
| Requires iOS | 17.2 | **15.6** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [IdeaBoys GmbH](https://appshunter.io/developer/1578331665) | [Eric Hamiter](https://appshunter.io/developer/1482332471) |

## What reviewers say

### Anchor Pro

[App page](https://appshunter.io/ios/app/anchor-pro/id1445476850)

This app helps boaters set and monitor their anchor position in real-time. It allows for defining safe zones, tracking boat movement, and receiving alerts for critical changes. Remote notifications and Apple Watch integration enhance its utility for secure anchoring.

**Highlights:** Set anchor location in real-time or manually, Define custom safe swing zones, Monitor boat movement and track history, Receive real-time alerts for position, GPS, and battery, Remote notifications via Telegram or email, Apple Watch companion app for key metrics

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Anchor Premium | $6.99 | per year |

**What reviewers like**

- 🚀 Reliable anchor alarm
- 👍 Easy to use interface
- 🔒 Works without cell/WiFi
- 💤 Helps user sleep soundly
- 🗺️ Detailed anchor tracking

**What reviewers complain about**

- 🐛 GPS accuracy issues
- 🔋 Drains device battery
- 🔍 Remote monitoring unreliable
- 💰 Subscription required for full features

**Reported bugs**

- App randomly shuts off
- Anchor position tracking glitches

**Requested features**

- Customizable anchor icon/color
- Integration with marine GPS/chartplotter
- Ability to adjust alarm parameters remotely


### Buoyancy Calc

[App page](https://appshunter.io/ios/app/buoyancy-calc/id1482332472)

Calculate the optimal weight for scuba diving based on environmental factors. Input your weight, water type, tank, and exposure suit to get a suggested weight for neutral buoyancy.

**Highlights:** Calculate suggested diving weight, Adjust for water type, Adjust for tank type, Adjust for exposure suit, Supports pounds and kilograms

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Anchor Pro free?

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

### Is Buoyancy Calc free?

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

### Which has better reviews, Anchor Pro or Buoyancy Calc?

Anchor Pro is rated higher. Anchor Pro averages 4.8 out of 5 from 3.6K ratings, while Buoyancy Calc averages 3.1 from 25 ratings.

### Do Anchor Pro or Buoyancy Calc have ads?

Neither Anchor Pro nor Buoyancy Calc shows ads.

### Which is updated more often, Anchor Pro or Buoyancy Calc?

Anchor Pro ships an update every 2 months, and Buoyancy Calc every 3 months. Most recently, Anchor Pro was updated on October 27, 2026 and Buoyancy Calc on October 22, 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.*