Motor Pitch Analyzer vs DriveShelf
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Motor Pitch Analyzer
Measure small motor rotation speed in real-time using your smartphone's microphone. View motor sound waveforms for rough guidance on shaft runout and brush conditions. Achieve better accuracy by narrowing the measurement range in a quiet environment.
- Real-time motor RPM measurement
- Motor sound waveform visualization
- Adjustable measurement range for accuracy
- Analysis of shaft runout and brush conditions
- Quiet environment measurement recommendation
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MotorPitchAnalyzer (MPA) is an app for measuring small motor rotation speed in real-time. Just bring the motor close to your smartphone's microphone for easy measurement! You can improve accuracy by narrowing the measurement range. The app shows the motor's maximum rotation speed based on stable rotation and frequency intensity. You can also quickly check for shaft runout and brush conditions by viewing the motor sound waveform in real-time (※ for rough guidance). Please measure in a quiet place for accurate results. Note that measurement accuracy may vary slightly depending on your iPhone or iPad's microphone performance.
DriveShelf
Catalog your external drives and access your files from your iPhone. Search and browse your entire drive catalog instantly, even when you're away from your Mac. View file details and sync seamlessly with the Mac companion app.
- Search all cataloged drives instantly
- Browse folders like Finder
- View file details (size, dates, drive location)
- Syncs with Mac via iCloud
- Private catalog in your iCloud
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DriveShelf for iPhone is the companion app to DriveShelf for Mac. Once you've cataloged your external drives on your Mac, this app lets you search and browse that catalog from your pocket — perfect for checking whether you still have a client's footage, even when you're nowhere near your drives. KEY FEATURES • Search every file across all your cataloged drives, instantly • Browse folders on any drive, just like Finder • See file details: size, dates, and which physical drive it's on • Automatically syncs with DriveShelf on your Mac via iCloud • Fully private — your catalog stays in your own iCloud account, never on our servers REQUIRES DriveShelf for Mac, available on the Mac App Store. This app is read-only — all scanning, organizing, and duplicate-finding happens on your Mac. Included free with your DriveShelf purchase — no separate charge.
Screenshots
Verdict
The clearest difference is price: Motor Pitch Analyzer at Free against DriveShelf's $14.99. Motor Pitch Analyzer also leads on iOS requirement (13.0 vs 26.5). DriveShelf's advantage is ads (none vs shown). On update cadence, 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
Motor Pitch Analyzer is free to download; DriveShelf costs $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Motor Pitch Analyzer ships an update monthly, DriveShelf fortnightly. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.
| Parameter | Motor Pitch Analyzer | DriveShelf |
|---|---|---|
| Price | Free — better | $14.99 |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 — better | — |
| Update frequency | Monthly | Fortnightly — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, Mac |
| Requires iOS | 13.0 — better | 26.5 |
| Further details — not scored | ||
| Size | 103 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Shiho Masuda | Sergiy Pudich |
Customer experience
Motor Pitch Analyzer
DriveShelf
In-app purchases
Motor Pitch Analyzer
No in-app purchases
DriveShelf
No in-app purchases
Questions
Is Motor Pitch Analyzer free?
Is DriveShelf free?
Do Motor Pitch Analyzer or DriveShelf have ads?
Which is updated more often, Motor Pitch Analyzer or DriveShelf?
Other comparisons
