# Motor Pitch Analyzer vs DriveShelf

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.

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 31, 2026 respectively.

## The numbers

| Metric | Motor Pitch Analyzer | DriveShelf |
| --- | --- | --- |
| Price | **Free** | $14.99 |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/motor-pitch-analyzer/id6502329028/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | **Ad-supported** | Paid |
| Size | 103 MB | 9 MB |
| Requires iOS | **13.0** | 26.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Shiho Masuda](https://appshunter.io/developer/500997902) | [Sergiy Pudich](https://appshunter.io/developer/6772950143) |

## What reviewers say

### Motor Pitch Analyzer

[App page](https://appshunter.io/ios/app/motor-pitch-analyzer/id6502329028)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none


### DriveShelf

[App page](https://appshunter.io/ios/app/driveshelf/id6772950141)

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.

**Highlights:** 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

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Motor Pitch Analyzer free?

Motor Pitch Analyzer is free to download, with no in-app purchases.

### Is DriveShelf free?

DriveShelf costs $14.99, with no in-app purchases.

### Do Motor Pitch Analyzer or DriveShelf have ads?

Motor Pitch Analyzer shows ads; DriveShelf does not.

### Which is updated more often, Motor Pitch Analyzer or DriveShelf?

Motor Pitch Analyzer ships an update monthly, and DriveShelf fortnightly. Most recently, Motor Pitch Analyzer was updated on October 25, 2026 and DriveShelf on October 31, 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.*