# Fish Mapping vs Sea Depth

The clearest difference is review sentiment: Sea Depth at 100% against Fish Mapping's 50%. Sea Depth also leads on update cadence (weekly vs every 3 weeks) and chart position (#192 vs unranked). Fish Mapping's advantage is rating (3.7 vs 3.0) and in-app purchases (none vs 10). On price, ratings volume, ads and device support there is nothing between them.

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

Fish Mapping holds the better App Store score, 3.7 against 3.0. Both are backed by a comparable volume of ratings — 3 and 4 respectively. Written reviews complicate that: 50% of Fish Mapping's written reviews are positive against 100% of Sea Depth's, so the app with the better star average is not the one people write more warmly about.

Fish Mapping ships an update every 3 weeks, Sea Depth weekly. The most recent releases landed on September 9, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Fish Mapping | Sea Depth |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (3 ratings)](https://appshunter.io/ios/app/fish-mapping/id6450968706/reviews)** | [3.0 (4 ratings)](https://appshunter.io/ios/app/sea-depth/id6747972372/reviews) |
| Number of ratings | 3 | **4** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Subscription | **Free with in-app purchases** |
| Best chart rank | — | **#192** |
| Size | 57 MB | 105 MB |
| Requires iOS | **13.4** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [OceanBytes Holding LLC](https://appshunter.io/developer/1686599948) | [Seadepth Charst](https://appshunter.io/developer/1823642107) |

## What reviewers say

### Fish Mapping

[App page](https://appshunter.io/ios/app/fish-mapping/id6450968706)

This app provides detailed fishing recommendations and environmental data to help anglers find the best spots for bait and game fish. It displays information like plankton strength, sea surface temperature, and ocean currents to optimize fishing trips.

**Highlights:** Fishing Recommendations, Weed Lines, Plankton Front Strength, Sea Surface Temperature, Sub-Surface Temperatures, Sea Surface Height Anomalies, Ocean Currents

**Features:** macOS Compatibility

**In-app purchases:** none


### Sea Depth

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

**Currently charting:** #192 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 Fish Mapping free?

Fish Mapping 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, Fish Mapping or Sea Depth?

Fish Mapping is rated higher. Fish Mapping averages 3.7 out of 5 from 3 ratings, while Sea Depth averages 3.0 from 4 ratings.

### Do Fish Mapping or Sea Depth have ads?

Neither Fish Mapping nor Sea Depth shows ads.

### Which is updated more often, Fish Mapping or Sea Depth?

Fish Mapping ships an update every 3 weeks, and Sea Depth weekly. Most recently, Fish Mapping was updated on September 9, 2026 and Sea Depth on September 14, 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.*