# AWU2UDDF vs ZDive

The clearest difference is update cadence: ZDive at every 4 days against AWU2UDDF's every 14 months. ZDive also leads on 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 AWU2UDDF against 5.0 for ZDive. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

AWU2UDDF ships an update every 14 months, ZDive every 4 days. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | AWU2UDDF | ZDive |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/awu2uddf/id1661616210/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/zdive/id6742788878/reviews) |
| Number of ratings | 2 | **3** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 4 days** |
| Monetization | Free | Free |
| Size | 1 MB | 17 MB |
| Requires iOS | **16.0** | 17.6 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Douglas Junkins](https://appshunter.io/developer/1661616212) | [ZYORK SOFTWARE LLC](https://appshunter.io/developer/1799979057) |

## What reviewers say

### 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


### ZDive

[App page](https://appshunter.io/ios/app/zdive/id6742788878)

This app transforms your Apple Watch into a professional dive companion, offering real-time tracking, decompression algorithms, and advanced analytics. Plan your dives, optimize gas mixtures, and manage your diver profile with comprehensive tools for both recreational and technical diving.

**Highlights:** Real-time dive tracking, Decompression algorithms, Dive planning suite, Breathing trainer, Live Activities & Widgets, CloudKit backup and sync

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

**In-app purchases:** none


## Frequently asked questions

### Is AWU2UDDF free?

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

### Is ZDive free?

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

### Which has better reviews, AWU2UDDF or ZDive?

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

### Do AWU2UDDF or ZDive have ads?

Neither AWU2UDDF nor ZDive shows ads.

### Which is updated more often, AWU2UDDF or ZDive?

AWU2UDDF ships an update every 14 months, and ZDive every 4 days. Most recently, AWU2UDDF was updated on November 3, 2026 and ZDive on November 4, 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.*