# iDeco Pro vs Subsurface

The clearest difference is price: Subsurface at Free against iDeco Pro's $8.99. Subsurface also leads on rating (4.5 vs 3.9) and update cadence (every 2 months vs every 18 months). iDeco Pro's advantage is iOS requirement (7.0 vs 17). On ads, in-app purchases and device support there is nothing between them.

Subsurface is free to download; iDeco Pro costs $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Subsurface holds the better App Store score, 4.5 against 3.9. Both are backed by a comparable volume of ratings — 10 and 48 respectively. Written reviews point the same way: 52% of iDeco Pro's written reviews are positive against 63% of Subsurface's.

iDeco Pro ships an update every 18 months, Subsurface every 2 months. The most recent releases landed on November 10, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | iDeco Pro | Subsurface |
| --- | --- | --- |
| Price | $8.99 | **Free** |
| Rating | [3.9 (10 ratings)](https://appshunter.io/ios/app/ideco-pro/id329772936/reviews) | **[4.5 (48 ratings)](https://appshunter.io/ios/app/subsurface-mobile/id1093217161/reviews)** |
| Number of ratings | 10 | **48** |
| Positive reviews | 52.0% of reviews | **63.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 3 MB | 52 MB |
| Requires iOS | **7.0** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [B2 Prototech LLC](https://appshunter.io/developer/1575972363) | [Dirk Hohndel](https://appshunter.io/developer/1093217160) |

## What reviewers say

### iDeco Pro

[App page](https://appshunter.io/ios/app/ideco-pro/id329772936)

This app is a comprehensive dive planner for technical divers, supporting both open circuit and closed-circuit rebreather (CCR) diving. It calculates decompression stops, gas usage, CNS and OTU exposure, and surface intervals. The app also includes a gas mixer for planning custom gas blends.

**Highlights:** Open Circuit and CCR dive planning, Decompression stop calculation, Gas usage and CNS/OTU tracking, Surface interval tracking, Gas fill/mixer functionality, Bailout planning for overhead environments, Configurable settings within the app

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is iDeco Pro free?

iDeco Pro costs $8.99, with no in-app purchases.

### Is Subsurface free?

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

### Which has better reviews, iDeco Pro or Subsurface?

Subsurface is rated higher. iDeco Pro averages 3.9 out of 5 from 10 ratings, while Subsurface averages 4.5 from 48 ratings.

### Do iDeco Pro or Subsurface have ads?

Neither iDeco Pro nor Subsurface shows ads.

### Which is updated more often, iDeco Pro or Subsurface?

iDeco Pro ships an update every 18 months, and Subsurface every 2 months. Most recently, iDeco Pro was updated on November 10, 2026 and Subsurface on November 2, 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.*