Subsurface vs Simple Nitrox
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.
Simple Nitrox
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Simple Nitrox provides an easy to use and very visible calculation of Maximum Operating Depth for scuba diving. The most appropriate nitrox mix can also be calculated for a planned depth. Widgets can be added to the Home Screen for up to 5 tanks for easy access to the values for previously analysed tanks and the application. Supports metric and imperial, and o2 up to 99%.
Screenshots
Verdict
The clearest difference is in-app purchases: Subsurface at none against Simple Nitrox's 1. Subsurface also leads on update cadence (every 2 months vs every 29 months). On price, ads, device support and iOS requirement 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. Simple Nitrox sells 1 one-off in-app purchase. Subsurface asks for nothing beyond the download.
Subsurface ships an update every 2 months, Simple Nitrox every 29 months. The most recent releases landed on September 18, 2026 and September 12, 2026 respectively.
| Parameter | Subsurface | Simple Nitrox |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (48 ratings) — better | — |
| Positive reviews | 63.3% of reviews | — |
| Number of ratings | 48 — better | — |
| Update frequency | Every 2 months — better | Every 29 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17 | 16.0 — better |
| Further details — not scored | ||
| Size | 52 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Dirk Hohndel | Simon Chivers |
In-app purchases
Subsurface
No in-app purchases
Simple Nitrox
- Simple Nitrox Full Access$0.99
Questions
Is Subsurface free?
Is Simple Nitrox free?
Do Subsurface or Simple Nitrox have ads?
Which is updated more often, Subsurface or Simple Nitrox?
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