SensorCheck™ vs CountMeDown
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SensorCheck™
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.
- 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
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The AIRMAR SensorCheck™ App, paired with the TDT1000 Transducer Diagnostic Tester, compares the performance of a transducer in the field to its original AIRMAR factory specifications. Simply install the SensorCheck™ app on your Bluetooth LE-enabled smart device, connect to the TDT1000, and get started! Accurately test both traditional and CHIRP-ready transducers that operate at frequencies ranging from 10 kHz to 500 kHz. With CHIRP-ready models and any traditional models 1kW and above, the TDT1000 will automatically read XducerID® features, such as transducer model, frequency, part number, serial number, total run time, and maximum internal ceramic temperature. When the test is complete, an IN RANGE or OUT OF RANGE determination is made and test reports are automatically generated. Results can be emailed or texted directly to the boat owner or an AIRMAR technician. SensorCheck™ enables technicians to automatically submit warranty information to AIRMAR. The TDT1000 kit includes test unit, TDT Test block, power supply, break-out box for bare wire transducers and carrying case. Additional OEM Test Cables required (sold separately).
CountMeDown
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.
- 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
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Made Specifically to satisfy the Racing Sailor during Start Sequence. Start, Stop & Rest buttons all Accessible on home screen! Sync to closest minute if you missed the gun - both up & down. Set countdown minutes easily... specify Sequence minute length, Number of classes & Interval/gap between Class starts. Custom Countdown sequences for Match Racing starts, including Attention, Entry & Flight info. AND, CountMeDown includes a VOICE countdown - allowing you to keep your hands free & head in the game!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | SensorCheck™ | CountMeDown |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 3.8 (6 ratings) — better | — |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 6 — better | — |
| Update frequency | Every 3 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 55 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Airmar Technology Inc. | Susanne LEECH |
Customer experience
SensorCheck™
CountMeDown
In-app purchases
SensorCheck™
No in-app purchases
CountMeDown
No in-app purchases
Questions
Is SensorCheck™ free?
Is CountMeDown free?
Do SensorCheck™ or CountMeDown have ads?
Which is updated more often, SensorCheck™ or CountMeDown?
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