# Alert Diver vs Dive Calculator

The clearest difference is review sentiment: Dive Calculator at 100% against Alert Diver's 25%. Dive Calculator also leads on rating (4.6 vs 4.0) and ratings volume (24 vs 4). Alert Diver's advantage is in-app purchases (none vs 2) and update cadence (every 6 months vs every 12 months). On price, ads and device support there is nothing between them.

Both are free to download. Dive Calculator sells 2 one-off in-app purchases. Alert Diver asks for nothing beyond the download.

Dive Calculator holds the better App Store score, 4.6 against 4.0. That said, the two scores are not equally well evidenced: Dive Calculator has 24 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 25% of Alert Diver's written reviews are positive against 100% of Dive Calculator's.

Alert Diver ships an update every 6 months, Dive Calculator every 12 months. The most recent releases landed on October 14, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Alert Diver | Dive Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/alert-diver/id480608662/reviews) | **[4.6 (24 ratings)](https://appshunter.io/ios/app/dive-calculator/id831751437/reviews)** |
| Number of ratings | 4 | **24** |
| Positive reviews | 25.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 12 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 92 MB | 7 MB |
| Requires iOS | 11.0 | **6.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Divers Alert Network](https://appshunter.io/developer/1482122935) | [Zanthic Automation Inc.](https://appshunter.io/developer/574695320) |

## What reviewers say

### Alert Diver

[App page](https://appshunter.io/ios/app/alert-diver/id480608662)

Explore dive industry insights, research, and safety information. Discover underwater photography, travel destinations, and marine environmental topics. This app provides valuable content for divers and enthusiasts.

**Highlights:** Dive industry research, Medical information, Dive safety guidelines, Underwater photography, Dive travel guides, Marine environmental topics

**Features:** macOS Compatibility

**In-app purchases:** none


### Dive Calculator

[App page](https://appshunter.io/ios/app/dive-calculator/id831751437)

This app provides comprehensive scuba diving calculations, including basic, nitrox, and trimix gas mixes. It supports both metric and imperial units, and allows for gas volume and cost calculations for blending and top-ups. Results can be easily copied for documentation.

**Highlights:** Basic, Nitrox, and Trimix calculations, Gas volume and cost calculations, Top-up and bleed down mix calculations, Metric and imperial unit support, Oxygen narcotic/non-narcotic selection, Copy results to clipboard

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EANx Calculations | $0.99 | one-time |
| Trimix Calculations | $0.99 | one-time |


## Frequently asked questions

### Is Alert Diver free?

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

### Is Dive Calculator free?

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

### Which has better reviews, Alert Diver or Dive Calculator?

Dive Calculator is rated higher. Alert Diver averages 4.0 out of 5 from 4 ratings, while Dive Calculator averages 4.6 from 24 ratings.

### Do Alert Diver or Dive Calculator have ads?

Neither Alert Diver nor Dive Calculator shows ads.

### Which is updated more often, Alert Diver or Dive Calculator?

Alert Diver ships an update every 6 months, and Dive Calculator every 12 months. Most recently, Alert Diver was updated on October 14, 2026 and Dive Calculator on October 8, 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.*