# Z dive log vs Thalos

The clearest difference is in-app purchases: Z dive log at none against Thalos's 2. Thalos's advantage is update cadence (daily vs every 4 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Thalos sells 2 in-app purchases, starting at $2.99 per month. Z dive log asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Z dive log against 5.0 for Thalos. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

Z dive log ships an update every 4 months, Thalos daily. The most recent releases landed on October 6, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Z dive log | Thalos |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/z-dive-log/id1202116382/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/thalos/id6761337227/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 58.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Daily** |
| Monetization | **Free** | Subscription |
| Size | 40 MB | 41 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SCUBAPRO ASIA LTD.](https://appshunter.io/developer/1202116381) | [JOHN WALLIS YOUNGBLOOD](https://appshunter.io/developer/1888980268) |

## What reviewers say

### Z dive log

[App page](https://appshunter.io/ios/app/z-dive-log/id1202116382)

Easily manage your SCUBAPRO Z1 dive computer logs and settings. Download dive data via Bluetooth, add details like location and photos, and configure your dive computer's preferences.

**Highlights:** Download dive logs via Bluetooth, Enter and edit dive log details, Add photos to dive logs, View dive statistics at a glance, Configure Z1 dive computer settings, Save and share depth graph images

**In-app purchases:** none


### Thalos

[App page](https://appshunter.io/ios/app/thalos/id6761337227)

This comprehensive dive app offers a robust dive logbook, detailed dive site information with emergency plans, and multiple dive calculators. It includes features for instructors to manage students and courses, and a social feed for divers to connect and share experiences. The app works fully offline, ensuring critical data is always accessible.

**Highlights:** Offline dive logbook, Dive site database with emergency plans, 9 essential dive calculators, Instructor module for course management, Social feed and community features, Emergency mode for critical access

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Thalos | $2.99 | per month |
| Thalos | $19.99 | per year |


## Frequently asked questions

### Is Z dive log free?

Z dive log is free to download, with no in-app purchases.

### Is Thalos free?

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

### Which has better reviews, Z dive log or Thalos?

Z dive log and Thalos are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do Z dive log or Thalos have ads?

Neither Z dive log nor Thalos shows ads.

### Which is updated more often, Z dive log or Thalos?

Z dive log ships an update every 4 months, and Thalos daily. Most recently, Z dive log was updated on October 6, 2026 and Thalos on October 13, 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.*