# Subsurface vs nDeco

The clearest difference is review sentiment: Subsurface at 63% against nDeco's 0%. Subsurface also leads on rating (4.5 vs 2.0) and 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.

Subsurface holds the better App Store score, 4.5 against 2.0. 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 0% of nDeco's.

Subsurface ships an update every 2 months, nDeco every 7 months. The most recent releases landed on October 6, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Subsurface | nDeco |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (48 ratings)](https://appshunter.io/ios/app/subsurface-mobile/id1093217161/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/ndeco/id6741527911/reviews) |
| Number of ratings | **48** | 1 |
| Positive reviews | **63.3% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 7 months |
| Monetization | Free | Free |
| Size | 52 MB | 73 MB |
| Requires iOS | **17** | 17.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dirk Hohndel](https://appshunter.io/developer/1093217160) | [Eyal Vardi](https://appshunter.io/developer/988684101) |

## 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


### nDeco

[App page](https://appshunter.io/ios/app/ndeco/id6741527911)

Plan multi-segment dives with ease using U.S. Navy and Bühlmann decompression models. Get instant dive information, depth limit guidance, and surface interval recommendations for safe underwater adventures.

**Highlights:** Multi-segment dive planning, U.S. Navy & Bühlmann decompression models, Depth limit guidance, Instant dive information, Surface interval recommendations, Metric/imperial unit flexibility

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Subsurface free?

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

### Is nDeco free?

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

### Which has better reviews, Subsurface or nDeco?

Subsurface is rated higher. Subsurface averages 4.5 out of 5 from 48 ratings, while nDeco averages 2.0 from 1 ratings.

### Do Subsurface or nDeco have ads?

Neither Subsurface nor nDeco shows ads.

### Which is updated more often, Subsurface or nDeco?

Subsurface ships an update every 2 months, and nDeco every 7 months. Most recently, Subsurface was updated on October 6, 2026 and nDeco on September 27, 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.*