# Scuba Dive Signals vs Simple Nitrox

The clearest difference is in-app purchases: Scuba Dive Signals at none against Simple Nitrox's 1. Scuba Dive Signals also leads on device support (3 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. Simple Nitrox sells 1 one-off in-app purchase. Scuba Dive Signals asks for nothing beyond the download.

Scuba Dive Signals ships an update every 42 months, Simple Nitrox every 29 months. The most recent releases landed on October 8, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Scuba Dive Signals | Simple Nitrox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/scuba-dive-signals/id1483856571/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 42 months | **Every 29 months** |
| Monetization | Free | — |
| Size | 3 MB | 2 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Eric Hamiter](https://appshunter.io/developer/1482332471) | [Simon Chivers](https://appshunter.io/developer/1698955737) |

## What reviewers say

### 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


### Simple Nitrox

[App page](https://appshunter.io/ios/app/simple-nitrox/id6463395880)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Simple Nitrox Full Access | $0.99 | one-time |


## Frequently asked questions

### Is Scuba Dive Signals free?

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

### Is Simple Nitrox free?

Simple Nitrox is free to download, with in-app purchases available.

### Do Scuba Dive Signals or Simple Nitrox have ads?

Neither Scuba Dive Signals nor Simple Nitrox shows ads.

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

Scuba Dive Signals ships an update every 42 months, and Simple Nitrox every 29 months. Most recently, Scuba Dive Signals was updated on October 8, 2026 and Simple Nitrox on September 12, 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.*