BeltTune vs M
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BeltTune
This utility app uses your phone's microphone to measure belt tension by analyzing audio frequencies. It provides instant measurements, supports multiple belt segments, and averages results for accuracy. Ideal for professionals and enthusiasts needing precise belt installations.
- Instant frequency measurement
- Real-time audio analysis
- Multiple belt segment support
- Automatic frequency averaging
- Intuitive workshop interface
- No external hardware needed
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BeltTune brings professional-grade belt tension measurement to your pocket. Using advanced audio analysis, this powerful tool helps engineers, mechanics, and maintenance professionals ensure optimal belt installation and performance. KEY FEATURES: • Instant frequency measurement with real-time audio analysis • Support for multiple belt segments with individual measurements • Automatic frequency averaging for consistent results • Clean, intuitive interface designed for workshop environments • No external hardware required - just your iPhone's microphone PERFECT FOR: • Ferrari • Porsche 944/928 • Lotus Esprit • Ducati HOW IT WORKS: Simply tap and hold the "Listen" button, strike the belt to create a vibration, and BeltTune will instantly display the belt's natural frequency. Multiple measurements can be taken and averaged for enhanced accuracy, ensuring your belt installations meet manufacturer specifications every time. PROFESSIONAL ACCURACY: BeltTune utilizes sophisticated signal processing and harmonic analysis to deliver precise frequency measurements between 60-500 Hz, making it suitable for most industrial and automotive belt applications. Get BeltTune today and take the guesswork out of belt tension measurement. Your belts (and your machines) will thank you.
M
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The M-JET Temperature Module app connects to your M-JET Temperature Module via Bluetooth to show live temperature data and let you switch between Water Temperature and Oil Temperature (depending on vehicle configuration). Built specifically for Sea-Doo riders, the system enables temperature information to be displayed directly in the Sea-Doo OEM cluster when the module is installed—ideal to monitor warm-up and keep an eye on key operating values. Key features - Live temperature readout (water or oil, depending on setup) + Battery voltage - Switch between water/oil display mode (depending on configuration) - Connection status and module information - Clean, rider-focused interface Important notes - Requires the M-JET Temperature Module hardware to function. - The displayed temperature type (water/oil) depends on your Sea-Doo’s sensor setup and configuration. - Bluetooth range and performance may vary by device and environment.
Screenshots
Verdict
The clearest difference is price: M at Free against BeltTune's $4.99. M also leads on update cadence (every 3 months vs every 7 months) and iOS requirement (16.0 vs 18.1). 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
M is free to download; BeltTune costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
BeltTune ships an update every 7 months, M every 3 months. The most recent releases landed on October 14, 2026 and October 4, 2026 respectively.
| Parameter | BeltTune | M |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 3.5 (2 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 7 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone | iPhone |
| Requires iOS | 18.1 | 16.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Justin Oakes | M-JET FLASHER GmbH |
In-app purchases
BeltTune
No in-app purchases
M
No in-app purchases









