# 1st vs Sea Depth

The clearest difference is rating: 1st at 5.0 against Sea Depth's 4.4. 1st also leads on in-app purchases (none vs 10). Sea Depth's advantage is update cadence (every 5 days vs monthly) and chart position (#187 vs unranked). On price, review sentiment, ratings volume and ads there is nothing between them.

Both are free to download. Sea Depth sells 10 in-app purchases, starting at $99.99 per year. 1st asks for nothing beyond the download.

1st holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 10 and 14 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

1st ships an update monthly, Sea Depth every 5 days. The most recent releases landed on October 6, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | 1st | Sea Depth |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (10 ratings)](https://appshunter.io/ios/app/1st-mate/id1446444330/reviews)** | [4.4 (14 ratings)](https://appshunter.io/ios/app/sea-depth/id6747972372/reviews) |
| Number of ratings | 10 | **14** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 5 days** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | — | **#187** |
| Size | 124 MB | 106 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mercury Marine LLC](https://appshunter.io/developer/1777822540) | [Seadepth Charts, LLC](https://appshunter.io/developer/1823642107) |

## What reviewers say

### 1st

[App page](https://appshunter.io/ios/app/1st-mate/id1446444330)

Control your boat's engine and security features remotely. Receive man overboard alerts and manage access for others. Enhances safety and security for boaters.

**Highlights:** Theft Deterrent control, Man Over Board alerts, Time-limited access granting, Proximity-based engine disabling, Emergency contact notifications

**Features:** Vision Pro support

**In-app purchases:** none


### Sea Depth

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

**Currently charting:** #187 Top Grossing · Navigation (US App Store)

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 1st free?

1st is free to download, with no in-app purchases.

### Is Sea Depth free?

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

### Which has better reviews, 1st or Sea Depth?

1st is rated higher. 1st averages 5.0 out of 5 from 10 ratings, while Sea Depth averages 4.4 from 14 ratings.

### Do 1st or Sea Depth have ads?

Neither 1st nor Sea Depth shows ads.

### Which is updated more often, 1st or Sea Depth?

1st ships an update monthly, and Sea Depth every 5 days. Most recently, 1st was updated on October 6, 2026 and Sea Depth on October 18, 2026.

---

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