# Tortuba vs Subsurface

The clearest difference is review sentiment: Tortuba at 100% against Subsurface's 63%. Tortuba also leads on rating (5.0 vs 4.5) and iOS requirement (14.0 vs 17). Subsurface's advantage is in-app purchases (none vs 10) and ratings volume (48 vs 1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Tortuba sells 10 one-off in-app purchases. Subsurface asks for nothing beyond the download.

Tortuba 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 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Tortuba's written reviews are positive against 63% of Subsurface's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 12, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Tortuba | Subsurface |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tortuba/id530872097/reviews)** | [4.5 (48 ratings)](https://appshunter.io/ios/app/subsurface-mobile/id1093217161/reviews) |
| Number of ratings | 1 | **48** |
| Positive reviews | **100.0% of reviews** | 63.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 93 MB | 52 MB |
| Requires iOS | **14.0** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Goodwhale](https://appshunter.io/developer/530872100) | [Dirk Hohndel](https://appshunter.io/developer/1093217160) |

## What reviewers say

### Tortuba

[App page](https://appshunter.io/ios/app/tortuba/id530872097)

Log your underwater adventures and identify marine species with this playful and simple app. It offers an offline species database, allows you to record dive details, and helps you share your experiences to raise ocean awareness.

**Highlights:** Offline species database, Log dive parameters, Identify marine species, Add dive photos, Share dive stories, Team member signatures

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bunaken | $9.99 | one-time |
| Roatan-Bays island | $9.99 | one-time |
| Komodo Creatures | $9.99 | one-time |
| Lembeh Strait | $9.99 | one-time |
| Komodo with Siren Fleet | $9.99 | one-time |
| Galapagos with Master Liveaboards | $9.99 | one-time |
| Fiji with Siren Fleet | $9.99 | one-time |
| Raja Ampat with Siren Fleet | $9.99 | one-time |
| Basking Shark Scotland | $9.99 | one-time |
| Bunaken with Siladen | $9.99 | 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 Tortuba free?

Tortuba 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, Tortuba or Subsurface?

Tortuba is rated higher. Tortuba averages 5.0 out of 5 from 1 ratings, while Subsurface averages 4.5 from 48 ratings.

### Do Tortuba or Subsurface have ads?

Neither Tortuba nor Subsurface shows ads.

### Which is updated more often, Tortuba or Subsurface?

Tortuba ships an update every 2 months, and Subsurface every 2 months. Most recently, Tortuba was updated on October 12, 2026 and Subsurface on October 14, 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.*