Subsurface vs Flaska
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.
Flaska
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A scuba tank calculator utility app -- calculates rock bottom air requirements, gas time, and transfills for various tank sizes.
Screenshots
Verdict
The clearest difference is iOS requirement: Flaska at 13.0 against Subsurface's 17. On price, update cadence, ads and in-app purchases 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.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 18, 2026 and September 17, 2026 respectively.
| Parameter | Subsurface | Flaska |
|---|---|---|
| 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 | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17 | 13.0 — better |
| Further details — not scored | ||
| Size | 52 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Dirk Hohndel | Kastelo AB |
In-app purchases
Subsurface
No in-app purchases
Flaska
No in-app purchases
