# Dive Calculator vs Subsurface

Dive Calculator and Subsurface both sit at 4.6 stars, but that hides the real split: 100% of Dive Calculator's written reviews are positive against 63% of Subsurface's. Dive Calculator also leads on iOS requirement (6.0 vs 17). Subsurface's advantage is in-app purchases (none vs 2) and update cadence (every 2 months vs every 12 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Dive Calculator sells 2 one-off in-app purchases. Subsurface asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for Dive Calculator against 4.5 for Subsurface. Both are backed by a comparable volume of ratings — 24 and 48 respectively. Written reviews are what separate them: 100% of Dive Calculator's written reviews are positive against 63% of Subsurface's.

Dive Calculator ships an update every 12 months, Subsurface every 2 months. The most recent releases landed on June 7, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Dive Calculator | Subsurface |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (24 ratings)](https://appshunter.io/ios/app/dive-calculator/id831751437/reviews)** | [4.5 (48 ratings)](https://appshunter.io/ios/app/subsurface-mobile/id1093217161/reviews) |
| Number of ratings | 24 | **48** |
| Positive reviews | **100.0% of reviews** | 63.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 7 MB | 52 MB |
| Requires iOS | **6.0** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Zanthic Automation Inc.](https://appshunter.io/developer/574695320) | [Dirk Hohndel](https://appshunter.io/developer/1093217160) |

## What reviewers say

### Dive Calculator

[App page](https://appshunter.io/ios/app/dive-calculator/id831751437)

This app provides comprehensive scuba diving calculations, including basic, nitrox, and trimix gas mixes. It supports both metric and imperial units, and allows for gas volume and cost calculations for blending and top-ups. Results can be easily copied for documentation.

**Highlights:** Basic, Nitrox, and Trimix calculations, Gas volume and cost calculations, Top-up and bleed down mix calculations, Metric and imperial unit support, Oxygen narcotic/non-narcotic selection, Copy results to clipboard

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EANx Calculations | $0.99 | one-time |
| Trimix Calculations | $0.99 | one-time |


### 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 Dive Calculator free?

Dive Calculator is free to download, with in-app purchases available.

### Is Subsurface free?

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

### Which has better reviews, Dive Calculator or Subsurface?

Dive Calculator is rated higher. Dive Calculator averages 4.6 out of 5 from 24 ratings, while Subsurface averages 4.5 from 48 ratings.

### Do Dive Calculator or Subsurface have ads?

Neither Dive Calculator nor Subsurface shows ads.

### Which is updated more often, Dive Calculator or Subsurface?

Dive Calculator ships an update every 12 months, and Subsurface every 2 months. Most recently, Dive Calculator was updated on June 7, 2026 and Subsurface 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.*