# Deep Tools vs Poseidon Reef

The clearest difference is review sentiment: Deep Tools at 50% against Poseidon Reef's 0%. Deep Tools also leads on rating (4.6 vs 3.0) and ads (none vs shown). Poseidon Reef's advantage is in-app purchases (none vs 3) and device support (4 vs 2). On price 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. Poseidon Reef asks for nothing beyond the download.

Deep Tools holds the better App Store score, 4.6 against 3.0. That said, the two scores are not equally well evidenced: Deep Tools has 93 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 50% of Deep Tools's written reviews are positive against 0% of Poseidon Reef's.

Deep Tools ships an update every 2 months, Poseidon Reef every 5 weeks. The most recent releases landed on November 13, 2026 and November 14, 2026 respectively.

## The numbers

| Metric | Deep Tools | Poseidon Reef |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (93 ratings)](https://appshunter.io/ios/app/deep-tools/id1476093876/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/poseidon-reef/id1581432645/reviews) |
| Number of ratings | **93** | 2 |
| Positive reviews | **50.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | Freemium | **Ad-supported** |
| Size | 13 MB | 58 MB |
| Requires iOS | 17.0 | **12.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Deep Blue d.o.o.](https://appshunter.io/developer/1476093875) | [Poseidon Diving Systems AB](https://appshunter.io/developer/567839779) |

## What reviewers say

### 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 |


### Poseidon Reef

[App page](https://appshunter.io/ios/app/poseidon-reef/id1581432645)

This app helps divers log, plan, and analyze their dives. It offers detailed overviews, customizable dive logs, and advanced planning for various dive types. Connect your dive computer to manage data and firmware.

**Highlights:** Comprehensive dive logging, Detailed dive planning, Support for OC and CCR dives, Unlimited tank support, Decompression model selection, Dive computer connectivity, Cloud backup and firmware updates

**In-app purchases:** none


## Frequently asked questions

### Is Deep Tools free?

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

### Is Poseidon Reef free?

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

### Which has better reviews, Deep Tools or Poseidon Reef?

Deep Tools is rated higher. Deep Tools averages 4.6 out of 5 from 93 ratings, while Poseidon Reef averages 3.0 from 2 ratings.

### Do Deep Tools or Poseidon Reef have ads?

Poseidon Reef shows ads; Deep Tools does not.

### Which is updated more often, Deep Tools or Poseidon Reef?

Deep Tools ships an update every 2 months, and Poseidon Reef every 5 weeks. Most recently, Deep Tools was updated on November 13, 2026 and Poseidon Reef on November 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.*