# Poseidon Reef vs Depth.

The clearest difference is ads: Depth. at none against Poseidon Reef's shown. Poseidon Reef's advantage is device support (4 vs 2) and iOS requirement (12.1 vs 16.0). On price, update cadence and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 5 weeks. The most recent releases landed on October 16, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Poseidon Reef | Depth. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/poseidon-reef/id1581432645/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | Every 5 weeks |
| Monetization | Ad-supported | — |
| Size | 58 MB | 2 MB |
| Requires iOS | **12.1** | 16.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Poseidon Diving Systems AB](https://appshunter.io/developer/567839779) | [Josephus Fransiscus Zegers](https://appshunter.io/developer/1887379576) |

## What reviewers say

### 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


### Depth.

[App page](https://appshunter.io/ios/app/depth/id6787236119)

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

**In-app purchases:** none


## Frequently asked questions

### Is Poseidon Reef free?

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

### Is Depth. free?

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

### Do Poseidon Reef or Depth. have ads?

Poseidon Reef shows ads; Depth. does not.

### Which is updated more often, Poseidon Reef or Depth.?

Poseidon Reef ships an update every 5 weeks, and Depth. every 5 weeks. Most recently, Poseidon Reef was updated on October 16, 2026 and Depth. on October 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.*