# Poseidon Reef vs DeepLog

The clearest difference is in-app purchases: Poseidon Reef at none against DeepLog's 1. Poseidon Reef also leads on device support (4 vs 2) and iOS requirement (12.1 vs 15.1). DeepLog's advantage is ads (none vs shown). On price and update cadence there is nothing between them.

Both are free to download. DeepLog sells 1 in-app purchase, starting at $1.99 per month. Poseidon Reef asks for nothing beyond the download.

Poseidon Reef ships an update every 5 weeks, DeepLog every 3 weeks. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Poseidon Reef | DeepLog |
| --- | --- | --- |
| 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** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Monetization | Ad-supported | — |
| Size | 58 MB | 50 MB |
| Requires iOS | **12.1** | 15.1 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Poseidon Diving Systems AB](https://appshunter.io/developer/567839779) | [Steven Saccio Photography LLC](https://appshunter.io/developer/1886648600) |

## 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


### DeepLog

[App page](https://appshunter.io/ios/app/deeplog-scuba-dive-log/id6760891889)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DeepLog Premium | $1.99 | per month |


## Frequently asked questions

### Is Poseidon Reef free?

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

### Is DeepLog free?

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

### Do Poseidon Reef or DeepLog have ads?

Poseidon Reef shows ads; DeepLog does not.

### Which is updated more often, Poseidon Reef or DeepLog?

Poseidon Reef ships an update every 5 weeks, and DeepLog every 3 weeks. Most recently, Poseidon Reef was updated on October 16, 2026 and DeepLog on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*