# Dive Calculator vs Scuba Dive Signals

The clearest difference is in-app purchases: Scuba Dive Signals at none against Dive Calculator's 2. Scuba Dive Signals also leads on rating (5.0 vs 4.7). Dive Calculator's advantage is update cadence (every 12 months vs every 42 months) and ratings volume (26 vs 3). On price, review sentiment, ads and monetization model there is nothing between them.

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

Scuba Dive Signals holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Dive Calculator has 26 ratings behind it against 3, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

Dive Calculator ships an update every 12 months, Scuba Dive Signals every 42 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Dive Calculator | Scuba Dive Signals |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (26 ratings)](https://appshunter.io/ios/app/dive-calculator/id831751437/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/scuba-dive-signals/id1483856571/reviews)** |
| Number of ratings | **26** | 3 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 12 months** | Every 42 months |
| Monetization | Free | Free |
| Size | 7 MB | 3 MB |
| Requires iOS | **6.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Zanthic Automation Inc.](https://appshunter.io/developer/574695320) | [Eric Hamiter](https://appshunter.io/developer/1482332471) |

## What reviewers say

### 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 |


### Scuba Dive Signals

[App page](https://appshunter.io/ios/app/scuba-dive-signals/id1483856571)

Access a comprehensive list of underwater hand signals for safe scuba diving communication. Includes a quiz feature to test your knowledge of signals recognized by major training agencies.

**Highlights:** List of recognized dive hand signals, Signals from PADI, NAUI, SSI, Quiz feature to test knowledge, Safety communication focus, Creative Commons licensed images

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Dive Calculator free?

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

### Is Scuba Dive Signals free?

Scuba Dive Signals is free to download, with no in-app purchases.

### Which has better reviews, Dive Calculator or Scuba Dive Signals?

Scuba Dive Signals is rated higher. Dive Calculator averages 4.7 out of 5 from 26 ratings, while Scuba Dive Signals averages 5.0 from 3 ratings.

### Do Dive Calculator or Scuba Dive Signals have ads?

Neither Dive Calculator nor Scuba Dive Signals shows ads.

### Which is updated more often, Dive Calculator or Scuba Dive Signals?

Dive Calculator ships an update every 12 months, and Scuba Dive Signals every 42 months. Most recently, Dive Calculator was updated on November 6, 2026 and Scuba Dive Signals on November 3, 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.*