# Great Depths vs Sea Depth

Great Depths and Sea Depth both sit at 4.2 stars, but that hides the real split: 100% of Sea Depth's written reviews are positive against 70% of Great Depths's. Sea Depth also leads on update cadence (every 5 days vs every 6 weeks). Great Depths's advantage is iOS requirement (8.0 vs 15.0). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Great Depths sells 10 one-off in-app purchases and Sea Depth sells 10 in-app purchases, starting at $99.99 per year. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.2 for Great Depths against 4.2 for Sea Depth. Both are backed by a comparable volume of ratings — 12 and 16 respectively. Written reviews are what separate them: 70% of Great Depths's written reviews are positive against 100% of Sea Depth's.

Great Depths ships an update every 6 weeks, Sea Depth every 5 days. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Great Depths | Sea Depth |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (12 ratings)](https://appshunter.io/ios/app/great-depths/id647627464/reviews) | **[4.2 (16 ratings)](https://appshunter.io/ios/app/sea-depth/id6747972372/reviews)** |
| Number of ratings | 12 | **16** |
| Positive reviews | 70.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 5 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 19 MB | 106 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Walk About Apps](https://appshunter.io/developer/480229755) | [Seadepth Charts, LLC](https://appshunter.io/developer/1823642107) |

## What reviewers say

### Great Depths

[App page](https://appshunter.io/ios/app/great-depths/id647627464)

This app transforms your iOS device into a digital depth finder. It provides comprehensive US coastal and Great Lakes coverage with live tide data and nautical charts. Navigate safely and efficiently with offline chart storage and distance calculation features.

**Highlights:** Digital depth readouts, Live tide data, NOAA RNC nautical charts, Offline chart storage, Distance calculation, Automatic chart syncing

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Huge East Coast Charts | Free | one-time |
| Midwest Florida Coast | Free | one-time |
| Southwest Florida Coast | Free | one-time |
| Southeast Florida Coast | Free | one-time |
| The Chesapeake Bay | Free | one-time |
| New Jersey Coast and The Delaware River | Free | one-time |
| Connecticut and New York Coast | Free | one-time |
| Maine, New Hampshire and Northern Mass. | Free | one-time |
| All the Charts | Free | one-time |
| Lake Champlain | $0.99 | one-time |


### Sea Depth

[App page](https://appshunter.io/ios/app/sea-depth/id6747972372)

Visualize detailed underwater terrain with high-resolution bathymetric charts. Gain deeper insights into seafloor structure, contours, and terrain for offshore activities. Includes optional data overlays and waypoint management for enhanced situational awareness.

**Highlights:** High-resolution shaded-relief bathymetry, Detailed depth contours with intelligent labeling, Optional data overlays (pipelines, bottom composition), GPX waypoint import/export, Drift Test tool, Offline chart access

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Charts Access | $99.99 | per year |
| Western GOA 50% | $150.00 | one-time |
| Eastern GOA 30% | $209.99 | one-time |
| Cental GOA 20% | $239.99 | one-time |
| Eastern GOA 20% | $239.99 | one-time |
| Cental GOA | $300.00 | one-time |
| Western GOA | $300.00 | one-time |
| Eastern GOA | $300.00 | one-time |
| Florida-West Coast | $300.00 | one-time |
| South Florida/Northern Bahamas | $300.00 | one-time |


## Frequently asked questions

### Is Great Depths free?

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

### Is Sea Depth free?

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

### Which has better reviews, Great Depths or Sea Depth?

Sea Depth is rated higher. Great Depths averages 4.2 out of 5 from 12 ratings, while Sea Depth averages 4.2 from 16 ratings.

### Do Great Depths or Sea Depth have ads?

Neither Great Depths nor Sea Depth shows ads.

### Which is updated more often, Great Depths or Sea Depth?

Great Depths ships an update every 6 weeks, and Sea Depth every 5 days. Most recently, Great Depths was updated on November 1, 2026 and Sea Depth on October 30, 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.*