# Submersion Dive Log vs Fathom Dive Planner

The clearest difference is in-app purchases: Submersion Dive Log at none against Fathom Dive Planner's 2. Submersion Dive Log also leads on iOS requirement (15.0 vs 18.0). Fathom Dive Planner's advantage is update cadence (daily vs every 4 days). On price, ads and device support there is nothing between them.

Both are free to download. Fathom Dive Planner sells 2 in-app purchases, starting at $6.99 per year. Submersion Dive Log asks for nothing beyond the download.

Submersion Dive Log ships an update every 4 days, Fathom Dive Planner daily. The most recent releases landed on October 8, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Submersion Dive Log | Fathom Dive Planner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (12 ratings)](https://appshunter.io/ios/app/submersion-dive-log/id6757456915/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | **Daily** |
| Monetization | Free | — |
| Size | 155 MB | 8 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Eric Griffin](https://appshunter.io/developer/1867101718) | [Total Immersion](https://appshunter.io/developer/408473253) |

## What reviewers say

### Submersion Dive Log

[App page](https://appshunter.io/ios/app/submersion-dive-log/id6757456915)

This app is a comprehensive, open-source dive log for recreational and technical divers. It allows users to track unlimited dives, manage gear, analyze trends, and export data. The app offers dive computer integration, advanced profile analysis, and detailed logging for various dive types and conditions.

**Highlights:** Log unlimited dives with detailed conditions, Dive computer integration, Advanced profile analysis, Technical diving support, Gear and equipment management, Dive site database with maps, Marine life tracking

**Features:** Vision Pro support

**In-app purchases:** none


### Fathom Dive Planner

[App page](https://appshunter.io/ios/app/fathom-dive-planner/id6775766574)

**Features:** Family Sharing, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fathom Premium - Annual | $6.99 | per year |
| Fathom Premium - Lifetime | $17.99 | one-time |


## Frequently asked questions

### Is Submersion Dive Log free?

Submersion Dive Log is free to download, with no in-app purchases.

### Is Fathom Dive Planner free?

Fathom Dive Planner is free to download, with in-app purchases available.

### Do Submersion Dive Log or Fathom Dive Planner have ads?

Neither Submersion Dive Log nor Fathom Dive Planner shows ads.

### Which is updated more often, Submersion Dive Log or Fathom Dive Planner?

Submersion Dive Log ships an update every 4 days, and Fathom Dive Planner daily. Most recently, Submersion Dive Log was updated on October 8, 2026 and Fathom Dive Planner on October 16, 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.*