ReefScan vs Marlin Keypad
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ReefScan
Capture underwater images and depth data to create 3D models with a companion desktop application. This tool is fast, accurate, and versatile, working both above and below water.
- Underwater image and depth map collection
- 3D model creation with MacOS companion app
- Fast and accurate scanning
- Above-water scanning capability
- Compatibility with other photogrammetry apps
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ReefScan for iOS collects images and depth map data for underwater features such as reefs, coral, and wrecks. This data can then be used with the MacOS companion app ReefBuild to create a 3-D model. Very fast and accurate scanning. Also works above water and can be used with other photogrammetry applications besides ReefBuild.
Marlin Keypad
This utility app allows users to connect with and control Marlin MFlex Legend Keypads. It provides essential functionality for managing these specialized devices.
- Connect to Marlin MFlex Legend Keypads
- Control Marlin MFlex Legend Keypads
- Utility functions
- Device management
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Utility app for connecting to and controlling Marlin MFlex Legend Keypads.
Screenshots
Verdict
The clearest difference is update cadence: Marlin Keypad at every 10 months against ReefScan's every 23 months. Marlin Keypad also leads on iOS requirement (12.0 vs 14.0). On price, rating, ratings volume and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for ReefScan against 5.0 for Marlin Keypad. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
ReefScan ships an update every 23 months, Marlin Keypad every 10 months. The most recent releases landed on June 1, 2026 and July 8, 2026 respectively.
| Parameter | ReefScan | Marlin Keypad |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Number of ratings | 1 | 1 |
| Update frequency | Every 23 months | Every 10 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 14.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 14 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | CraniaLab, LLC | Marlin Technologies, Inc. |
Customer experience
ReefScan
Marlin Keypad
In-app purchases
ReefScan
No in-app purchases
Marlin Keypad
No in-app purchases
Questions
Is ReefScan free?
Is Marlin Keypad free?
Which has better reviews, ReefScan or Marlin Keypad?
Do ReefScan or Marlin Keypad have ads?
Which is updated more often, ReefScan or Marlin Keypad?
Other comparisons
