# Subsurface vs Tech Dive

The clearest difference is review sentiment: Tech Dive at 100% against Subsurface's 63%. Tech Dive also leads on rating (5.0 vs 4.5) and update cadence (every 4 weeks vs every 2 months). Subsurface's advantage is in-app purchases (none vs 2) and ratings volume (48 vs 2). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Tech Dive sells 2 in-app purchases, starting at $0.99 per month. Subsurface asks for nothing beyond the download.

Tech Dive holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Subsurface has 48 ratings behind it against 2, 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 100% of Tech Dive's.

Subsurface ships an update every 2 months, Tech Dive every 4 weeks. The most recent releases landed on September 18, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Subsurface | Tech Dive |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (48 ratings)](https://appshunter.io/ios/app/subsurface-mobile/id1093217161/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/tech-dive/id6483004689/reviews)** |
| Number of ratings | **48** | 2 |
| Positive reviews | 63.3% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 52 MB | 16 MB |
| Requires iOS | 17 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dirk Hohndel](https://appshunter.io/developer/1093217160) | [Skytip LLC](https://appshunter.io/developer/1569880600) |

## 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


### Tech Dive

[App page](https://appshunter.io/ios/app/tech-dive/id6483004689)

This app helps plan scuba dives with various calculators for gas, depth, and air consumption. It supports metric and imperial units and offers advanced features through an in-app purchase.

**Highlights:** Dive planning calculators, Gas and air consumption calculations, Metric and imperial unit support, Depth and EAD calculations, Enriched Air-Nitrox mix calculation, Unit conversion tools

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Monthly | $0.99 | per month |
| Plus Annual | $7.99 | per year |


## Frequently asked questions

### Is Subsurface free?

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

### Is Tech Dive free?

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

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

Tech Dive is rated higher. Subsurface averages 4.5 out of 5 from 48 ratings, while Tech Dive averages 5.0 from 2 ratings.

### Do Subsurface or Tech Dive have ads?

Neither Subsurface nor Tech Dive shows ads.

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

Subsurface ships an update every 2 months, and Tech Dive every 4 weeks. Most recently, Subsurface was updated on September 18, 2026 and Tech Dive on September 24, 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.*