# Subsurface vs Deep Tools

The clearest difference is in-app purchases: Subsurface at none against Deep Tools's 3. Subsurface also leads on review sentiment (63% vs 50%). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Deep Tools sells 3 in-app purchases, starting at $7.99 per month. Subsurface asks for nothing beyond the download.

Deep Tools holds the better App Store score, 4.6 against 4.5. Both are backed by a comparable volume of ratings — 48 and 93 respectively. Written reviews complicate that: 63% of Subsurface's written reviews are positive against 50% of Deep Tools's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 2, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | Subsurface | Deep Tools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (48 ratings)](https://appshunter.io/ios/app/subsurface-mobile/id1093217161/reviews) | **[4.6 (93 ratings)](https://appshunter.io/ios/app/deep-tools/id1476093876/reviews)** |
| Number of ratings | 48 | **93** |
| Positive reviews | **63.3% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Freemium |
| Size | 52 MB | 13 MB |
| Requires iOS | 17 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dirk Hohndel](https://appshunter.io/developer/1093217160) | [Deep Blue d.o.o.](https://appshunter.io/developer/1476093875) |

## 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


### Deep Tools

[App page](https://appshunter.io/ios/app/deep-tools/id1476093876)

This app is a comprehensive tool for divers, offering dive planning, logging, and gas blending. It supports recreational, technical, and rebreather diving with advanced decompression planning and dive computer integration. Plan complex dives, log your adventures, and mix gases with precision.

**Highlights:** Decompression dive planning (Bühlmann ZH-L16), Dive log with Shearwater import, Nitrox and Trimix gas blending, Multiple dive calculators, Metric and imperial unit support, Multi-level and repetitive dive planning

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Subscription Monthly | $7.99 | per month |
| Subscription Yearly | $22.99 | per year |
| Lifetime Subscription | $49.99 | one-time |


## Frequently asked questions

### Is Subsurface free?

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

### Is Deep Tools free?

Deep Tools is free to download, with in-app purchases available.

### Which has better reviews, Subsurface or Deep Tools?

Deep Tools is rated higher. Subsurface averages 4.5 out of 5 from 48 ratings, while Deep Tools averages 4.6 from 93 ratings.

### Do Subsurface or Deep Tools have ads?

Neither Subsurface nor Deep Tools shows ads.

### Which is updated more often, Subsurface or Deep Tools?

Subsurface ships an update every 2 months, and Deep Tools every 2 months. Most recently, Subsurface was updated on November 2, 2026 and Deep Tools on November 13, 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.*