# ZDive vs Fathom Dive Planner

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

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

ZDive ships an update every 4 days, Fathom Dive Planner daily. The most recent releases landed on October 11, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | ZDive | Fathom Dive Planner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/zdive/id6742788878/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | **Daily** |
| Monetization | Free | — |
| Size | 17 MB | 8 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [ZYORK SOFTWARE LLC](https://appshunter.io/developer/1799979057) | [Total Immersion](https://appshunter.io/developer/408473253) |

## What reviewers say

### ZDive

[App page](https://appshunter.io/ios/app/zdive/id6742788878)

This app transforms your Apple Watch into a professional dive companion, offering real-time tracking, decompression algorithms, and advanced analytics. Plan your dives, optimize gas mixtures, and manage your diver profile with comprehensive tools for both recreational and technical diving.

**Highlights:** Real-time dive tracking, Decompression algorithms, Dive planning suite, Breathing trainer, Live Activities & Widgets, CloudKit backup and sync

**Features:** macOS Compatibility, Apple Watch app, 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 ZDive free?

ZDive 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 ZDive or Fathom Dive Planner have ads?

Neither ZDive nor Fathom Dive Planner shows ads.

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

ZDive ships an update every 4 days, and Fathom Dive Planner daily. Most recently, ZDive was updated on October 11, 2026 and Fathom Dive Planner on October 25, 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.*