# Scuba Dive Signals vs AWU2UDDF

The clearest difference is update cadence: AWU2UDDF at every 14 months against Scuba Dive Signals's every 42 months. Scuba Dive Signals's advantage is device support (3 vs 1). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Scuba Dive Signals against 5.0 for AWU2UDDF. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Scuba Dive Signals ships an update every 42 months, AWU2UDDF every 14 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Scuba Dive Signals | AWU2UDDF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/scuba-dive-signals/id1483856571/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/awu2uddf/id1661616210/reviews) |
| Number of ratings | **3** | 2 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 42 months | **Every 14 months** |
| Monetization | Free | Free |
| Size | 3 MB | 1 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Eric Hamiter](https://appshunter.io/developer/1482332471) | [Douglas Junkins](https://appshunter.io/developer/1661616212) |

## 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


### AWU2UDDF

[App page](https://appshunter.io/ios/app/awu2uddf/id1661616210)

Export underwater depth and temperature data from your Apple Watch to a standard UDDF XML file. This file can then be imported into popular diving log software for comprehensive record-keeping. It seamlessly integrates with the Health App and HealthKit.

**Highlights:** Export underwater depth and temperature data, Standard Universal Dive Data Format (UDDF) XML output, Import into Macdive or Subsurface, Integrates with Health App and HealthKit

**In-app purchases:** none


## Frequently asked questions

### Is Scuba Dive Signals free?

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

### Is AWU2UDDF free?

AWU2UDDF is free to download, with no in-app purchases.

### Which has better reviews, Scuba Dive Signals or AWU2UDDF?

Scuba Dive Signals and AWU2UDDF are both rated 5.0 out of 5 on the App Store, from 3 and 2 ratings respectively.

### Do Scuba Dive Signals or AWU2UDDF have ads?

Neither Scuba Dive Signals nor AWU2UDDF shows ads.

### Which is updated more often, Scuba Dive Signals or AWU2UDDF?

Scuba Dive Signals ships an update every 42 months, and AWU2UDDF every 14 months. Most recently, Scuba Dive Signals was updated on November 3, 2026 and AWU2UDDF 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.*