Comparison

Subsurface vs nDeco

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Mobile dive log management
  • Edit dive data
  • Download from Bluetooth LE dive computers
  • Optional cloud synchronization
  • Open-source and free
Read full description

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.

About

nDeco

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
Read full description

WHAT MAKES nDeco UNIQUE? * Simple and easy Dive Planning: Calculate multi-segment dive profiles * Safety First Approach: Built on U.S. Navy Diving Manual and Bühlmann ZH-L16 decompression models * Easy-to-Use Interface: Plan complex dives with just a few taps * Dynamic dive information * Easy to simulate multi segments dive scenarios KEY FEATURES: * Depth Limit Guidance: Safely plan dives from shallow reefs to deeper explorations * Multi-Segment Dive Planning: Create detailed dive profiles with multiple depth segments * Instant Dive Information: See total dive time, descent/ascent times, and surface intervals * Unit Flexibility: Switch between metric (meters) and imperial (feet) with one tap * Surface Interval Recommendations: Ensures safe intervals between multiple daily dives DESIGNED FOR DIVERS BY DIVERS for the recreational diver- nDeco provides the tools you need to plan safe, enjoyable underwater adventures. SAFETY DISCLAIMER: * Calibrated for sea-level, salt water diving * Designed for compressed air (21% oxygen) * Always dive within your training and certification limits DIVE SAFE. DIVE SMART. DIVE nDeco!

Screenshots

Subsurface4 screens
nDeco4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Subsurface versus nDeco: the parameters behind the verdict, then further details
ParameterSubsurfacenDeco
PriceFreeFree
Rating4.5 (48 ratings) — better2.0 (1 ratings)
Positive reviews63.3% of reviews — better0.0% of reviews
Number of ratings48 — better1
Update frequencyEvery 2 months — betterEvery 7 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad
Requires iOS17 — better17.2
Further details — not scored
Size52 MB73 MB
Age rating4+4+
DeveloperDirk HohndelEyal Vardi

Customer experience

Subsurface

All ratings48 ratings
Positive89.6%
Neutral2.1%
Negative8.3%
Written reviews30 reviews
Positive63.3%
Neutral6.7%
Negative30.0%

nDeco

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Subsurface

No in-app purchases

None

nDeco

No in-app purchases

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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