Subsurface vs O'Dive
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Subsurface
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.
- Mobile dive log management
- Edit dive data
- Download from Bluetooth LE dive computers
- Optional cloud synchronization
- Open-source and free
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Subsurface-mobile is an iOS dive log application based on Subsurface, the best free open source dive log application available on Windows, Mac and Linux. Subsurface-mobile allows you to access your dive log on your tablet or phone, edit the data and even download new dive information from many Bluetooth LE enabled dive computers. Using a free Subsurface Cloud Storage account you can synchronize your dive data with the Subsurface desktop application (while significantly increasing the usefulness, the cloud account is not required to use Subsurface-mobile). To get support from the developers, please use the in-app menu entry "Ask for support" Please check out the Subsurface-mobile user manual: https://subsurface-divelog.org/documentation/subsurface-mobile-v3-user-manual (also available from within the app) Subsurface-mobile is free and open source. No ads, no commercial anything. And it comes with free cloud storage (if you decide to use that - it's optional). Your data aren't used for anything, nothing gets monetized.
O'Dive
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.
- Acoustic sensor technology
- Gas microbubble detection
- Personalized decompression analysis
- Diving practice improvement
- Diving safety enhancement
- Sensor control interface
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O'Dive's unique and patented technology includes an acoustic sensor connected to a smartphone app and a server with specialised analysis capabilities. O'Dive's objectives are: - Indicating to divers, by taking into consideration gas microbubbles detected, the adequation of their decompression procedures with their own person and diving practice; - Help them improve their practice and safety. The personalization of the diving procedure is based on the acoustic measurement of circulating gas microbubbles detected post-dive in the divers' venous system. O'Dive app allows to control the sensor by being the interface between the sensor, the server and the user. O'Dive is a technological innovation developped by AZOTH SYSTEMS.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Subsurface | O'Dive |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (48 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 63.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 48 — better | 1 |
| Update frequency | Every 2 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17 | 13.0 — better |
| Further details — not scored | ||
| Size | 52 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Dirk Hohndel | AZOTH SYSTEMS |
Customer experience
Subsurface
O'Dive
In-app purchases
Subsurface
No in-app purchases
O'Dive
No in-app purchases
