# ATMOS vs U

The clearest difference is update cadence: U at every 2 weeks against ATMOS's every 6 weeks. ATMOS's advantage is iOS requirement (15.0 vs 26.4). On price, ads, in-app purchases and device support there is nothing between them.

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

ATMOS ships an update every 6 weeks, U every 2 weeks. The most recent releases landed on November 2, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | ATMOS | U |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.7 (23 ratings)](https://appshunter.io/ios/app/atmos-diving-logbooks/id1448666557/reviews)** | — |
| Number of ratings | **23** | — |
| Positive reviews | 7.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 119 MB | 10 MB |
| Requires iOS | **15.0** | 26.4 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [ATMOS CO., LTD.](https://appshunter.io/developer/1448666556) | [Yao YungTai](https://appshunter.io/developer/6805562795) |

## What reviewers say

### ATMOS

[App page](https://appshunter.io/ios/app/atmos-diving-logbooks/id1448666557)

Easily sync and manage your dive logs wirelessly from compatible dive computers. View device information, edit log details, and export your data in UDDF format. Integrates with HealthKit to share dive-related health metrics.

**Highlights:** Wireless dive log syncing, Dive computer information, Edit dive log details, Export logs to UDDF, HealthKit integration

**In-app purchases:** none


### U

[App page](https://appshunter.io/ios/app/u-dive/id6805562793)

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

**In-app purchases:** none


## Frequently asked questions

### Is ATMOS free?

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

### Is U free?

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

### Do ATMOS or U have ads?

Neither ATMOS nor U shows ads.

### Which is updated more often, ATMOS or U?

ATMOS ships an update every 6 weeks, and U every 2 weeks. Most recently, ATMOS was updated on November 2, 2026 and U on October 29, 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.*