# Subsurface vs O'Dive

The clearest difference is review sentiment: O'Dive at 100% against Subsurface's 63%. O'Dive also leads on rating (5.0 vs 4.5) and update cadence (monthly vs every 2 months). Subsurface's advantage is ratings volume (48 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

O'Dive holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Subsurface has 48 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 63% of Subsurface's written reviews are positive against 100% of O'Dive's.

Subsurface ships an update every 2 months, O'Dive monthly. The most recent releases landed on September 27, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Subsurface | O'Dive |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (48 ratings)](https://appshunter.io/ios/app/subsurface-mobile/id1093217161/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/odive/id1534593720/reviews)** |
| Number of ratings | **48** | 1 |
| Positive reviews | 63.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | Free |
| Size | 52 MB | 25 MB |
| Requires iOS | 17 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Dirk Hohndel](https://appshunter.io/developer/1093217160) | [AZOTH SYSTEMS](https://appshunter.io/developer/1534593722) |

## What reviewers say

### Subsurface

[App page](https://appshunter.io/ios/app/subsurface-mobile/id1093217161)

This application allows divers to manage their dive logs on their mobile devices. It supports editing dive data and downloading new information from compatible dive computers. Optional cloud synchronization is available for seamless data transfer with desktop versions.

**Highlights:** Mobile dive log management, Edit dive data, Download from Bluetooth LE dive computers, Optional cloud synchronization, Open-source and free

**In-app purchases:** none


### O'Dive

[App page](https://appshunter.io/ios/app/odive/id1534593720)

This app uses patented acoustic sensor technology to analyze gas microbubbles detected after a dive. It helps divers assess their decompression procedures and improve their safety and practice based on personalized acoustic measurements.

**Highlights:** Acoustic sensor technology, Gas microbubble detection, Personalized decompression analysis, Diving practice improvement, Diving safety enhancement, Sensor control interface

**In-app purchases:** none


## Frequently asked questions

### Is Subsurface free?

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

### Is O'Dive free?

O'Dive is free to download, with no in-app purchases.

### Which has better reviews, Subsurface or O'Dive?

O'Dive is rated higher. Subsurface averages 4.5 out of 5 from 48 ratings, while O'Dive averages 5.0 from 1 ratings.

### Do Subsurface or O'Dive have ads?

Neither Subsurface nor O'Dive shows ads.

### Which is updated more often, Subsurface or O'Dive?

Subsurface ships an update every 2 months, and O'Dive monthly. Most recently, Subsurface was updated on September 27, 2026 and O'Dive on September 17, 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.*