# ReefScan vs Marlin Keypad

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.

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.

## The numbers

| Metric | ReefScan | Marlin Keypad |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/reefscan/id6444350547/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/marlin-keypad/id6479428020/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 10 months** |
| Monetization | Free | Free |
| Size | 14 MB | 33 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CraniaLab, LLC](https://appshunter.io/developer/1495242488) | [Marlin Technologies, Inc.](https://appshunter.io/developer/1735942032) |

## What reviewers say

### ReefScan

[App page](https://appshunter.io/ios/app/reefscan/id6444350547)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none


### Marlin Keypad

[App page](https://appshunter.io/ios/app/marlin-keypad/id6479428020)

This utility app allows users to connect with and control Marlin MFlex Legend Keypads. It provides essential functionality for managing these specialized devices.

**Highlights:** Connect to Marlin MFlex Legend Keypads, Control Marlin MFlex Legend Keypads, Utility functions, Device management

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ReefScan free?

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

### Is Marlin Keypad free?

Marlin Keypad is free to download, with no in-app purchases.

### Which has better reviews, ReefScan or Marlin Keypad?

ReefScan and Marlin Keypad are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do ReefScan or Marlin Keypad have ads?

Neither ReefScan nor Marlin Keypad shows ads.

### Which is updated more often, ReefScan or Marlin Keypad?

ReefScan ships an update every 23 months, and Marlin Keypad every 10 months. Most recently, ReefScan was updated on June 1, 2026 and Marlin Keypad on July 8, 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.*