# Subsurface vs Ratio Divelogger

The clearest difference is update cadence: Subsurface at every 2 months against Ratio Divelogger's every 9 months. Ratio Divelogger's advantage is iOS requirement (14.2 vs 17). On price, ads, in-app purchases and device support there is nothing between them.

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

Subsurface ships an update every 2 months, Ratio Divelogger every 9 months. The most recent releases landed on November 2, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Subsurface | Ratio Divelogger |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (48 ratings)](https://appshunter.io/ios/app/subsurface-mobile/id1093217161/reviews)** | — |
| Number of ratings | **48** | — |
| Positive reviews | 63.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 9 months |
| Monetization | Free | — |
| Size | 52 MB | 90 MB |
| Requires iOS | 17 | **14.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Dirk Hohndel](https://appshunter.io/developer/1093217160) | [Jiri Prajz](https://appshunter.io/developer/1857249962) |

## 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


### Ratio Divelogger

[App page](https://appshunter.io/ios/app/ratio-divelogger/id6755915911)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Subsurface free?

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

### Is Ratio Divelogger free?

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

### Do Subsurface or Ratio Divelogger have ads?

Neither Subsurface nor Ratio Divelogger shows ads.

### Which is updated more often, Subsurface or Ratio Divelogger?

Subsurface ships an update every 2 months, and Ratio Divelogger every 9 months. Most recently, Subsurface was updated on November 2, 2026 and Ratio Divelogger on November 9, 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.*