# ATMOS vs HARD

The clearest difference is rating: HARD at 3.0 against ATMOS's 1.7. HARD also leads on update cadence (fortnightly vs every 6 weeks) and iOS requirement (11.0 vs 15.0). ATMOS's advantage is ratings volume (23 vs 6). On price, review sentiment, ads and in-app purchases there is nothing between them.

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

HARD holds the better App Store score, 3.0 against 1.7. Both are backed by a comparable volume of ratings — 23 and 6 respectively. Written reviews point the same way: 8% of ATMOS's written reviews are positive against 14% of HARD's.

ATMOS ships an update every 6 weeks, HARD fortnightly. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | ATMOS | HARD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.7 (23 ratings)](https://appshunter.io/ios/app/atmos-diving-logbooks/id1448666557/reviews) | **[3.0 (6 ratings)](https://appshunter.io/ios/app/hard/id1475606673/reviews)** |
| Number of ratings | **23** | 6 |
| Positive reviews | 7.7% of reviews | **13.9% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Fortnightly** |
| Monetization | Free | Free |
| Size | 119 MB | 181 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ATMOS CO., LTD.](https://appshunter.io/developer/1448666556) | [Qianhai Walnut Technology Co.,Ltd](https://appshunter.io/developer/1294078241) |

## 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


### HARD

[App page](https://appshunter.io/ios/app/hard/id1475606673)

This app syncs with smart devices to track daily activity like steps, distance, and calories. It also monitors heart rate, sleep patterns, and records exercise routes. Receive reminders for messages, alarms, and hydration.

**Highlights:** Activity tracking (steps, distance, calories), Exercise recording with GPS tracking, Heart rate monitoring and analysis, Sleep pattern analysis, Message and reminder notifications, HealthKit integration

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ATMOS free?

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

### Is HARD free?

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

### Which has better reviews, ATMOS or HARD?

HARD is rated higher. ATMOS averages 1.7 out of 5 from 23 ratings, while HARD averages 3.0 from 6 ratings.

### Do ATMOS or HARD have ads?

Neither ATMOS nor HARD shows ads.

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

ATMOS ships an update every 6 weeks, and HARD fortnightly. Most recently, ATMOS was updated on November 2, 2026 and HARD 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.*