# SensorCheck™ vs CountMeDown

The clearest difference is review sentiment: CountMeDown at 100% against SensorCheck™'s 0%. CountMeDown also leads on update cadence (every 3 weeks vs every 3 months). SensorCheck™'s advantage is price (Free vs $1.99) and iOS requirement (12.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

SensorCheck™ is free to download; CountMeDown costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SensorCheck™ ships an update every 3 months, CountMeDown every 3 weeks. The most recent releases landed on October 13, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | SensorCheck™ | CountMeDown |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[3.8 (6 ratings)](https://appshunter.io/ios/app/sensorcheck/id1062316790/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | **Free** | Paid |
| Size | 55 MB | 3 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Airmar Technology Inc.](https://appshunter.io/developer/1062316789) | [Susanne LEECH](https://appshunter.io/developer/1328526040) |

## What reviewers say

### SensorCheck™

[App page](https://appshunter.io/ios/app/sensorcheck/id1062316790)

This app allows users to test marine transducers against factory specifications using a connected diagnostic tester. It provides detailed reports on transducer performance and automatically generates warranty information for eligible models.

**Highlights:** Compares transducer performance to factory specs, Tests traditional and CHIRP-ready transducers, Reads XducerID® features automatically, Generates automatic test reports, Enables warranty information submission, Supports Bluetooth LE connectivity

**Features:** macOS Compatibility

**In-app purchases:** none


### CountMeDown

[App page](https://appshunter.io/ios/app/countmedown/id6476015474)

This app is designed for racing sailors to manage start sequences. It offers easy access to start, stop, and rest functions, allows syncing to the closest minute, and supports custom countdown sequences for various racing scenarios. A voice countdown feature keeps hands free during the race.

**Highlights:** Start, Stop & Rest buttons on home screen, Sync to closest minute (up & down), Custom countdown sequences, Voice countdown feature, Specify sequence minute length, Specify number of classes & interval

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SensorCheck™ free?

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

### Is CountMeDown free?

CountMeDown costs $1.99, with no in-app purchases.

### Do SensorCheck™ or CountMeDown have ads?

Neither SensorCheck™ nor CountMeDown shows ads.

### Which is updated more often, SensorCheck™ or CountMeDown?

SensorCheck™ ships an update every 3 months, and CountMeDown every 3 weeks. Most recently, SensorCheck™ was updated on October 13, 2026 and CountMeDown on September 11, 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.*