# USB Disk Pro vs Strongbox Zero

The clearest difference is update cadence: Strongbox Zero at every 2 weeks against USB Disk Pro's every 3 months. Strongbox Zero also leads on review sentiment (75% vs 66%). USB Disk Pro's advantage is rating (4.5 vs 4.3) and ratings volume (142 vs 21). On price, ads, in-app purchases and monetization model there is nothing between them.

USB Disk Pro costs $99.99 and Strongbox Zero $99.99 up front. Neither carries in-app purchases, so what you see is what you pay.

USB Disk Pro holds the better App Store score, 4.5 against 4.3. That said, the two scores are not equally well evidenced: USB Disk Pro has 142 ratings behind it against 21, so its average is the more settled of the two. Written reviews complicate that: 66% of USB Disk Pro's written reviews are positive against 75% of Strongbox Zero's, so the app with the better star average is not the one people write more warmly about.

USB Disk Pro ships an update every 3 months, Strongbox Zero every 2 weeks. The most recent releases landed on October 22, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | USB Disk Pro | Strongbox Zero |
| --- | --- | --- |
| Price | $99.99 | $99.99 |
| Rating | **[4.5 (142 ratings)](https://appshunter.io/ios/app/usb-disk-pro/id412591849/reviews)** | [4.3 (21 ratings)](https://appshunter.io/ios/app/strongbox-zero/id1581589638/reviews) |
| Number of ratings | **142** | 21 |
| Positive reviews | 65.6% of reviews | **75.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Paid | Paid |
| Size | 215 MB | 96 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad, Apple TV, Apple Watch | **iPhone, iPad, iPod, Mac, Apple Watch** |
| Age rating | 17+ | 4+ |
| Developer | [Imesart S.a.r.l.](https://appshunter.io/developer/290160983) | [Phoebe Code Limited](https://appshunter.io/developer/897283734) |

## What reviewers say

### USB Disk Pro

[App page](https://appshunter.io/ios/app/usb-disk-pro/id412591849)

Manage and view documents on your iPhone and iPad with this powerful file manager. It offers a built-in viewer, easy file transfers via iTunes or Wi-Fi, and supports numerous cloud services. Secure your files with encryption and access them from various locations.

**Highlights:** Store and view files, Built-in document viewer, iTunes and Wi-Fi file transfers, Cloud service integration, File encryption and protection, Supports Files app

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none

**What reviewers like**

- 🚀 Simple and reliable
- 👍 Great for file storage and management
- 🚀 Efficient file transfer
- 👍 Versatile file support
- 🚀 Excellent app for iPad/iPhone

**What reviewers complain about**

- 🐛 Occasional crashes and stability issues
- 🐛 Compatibility problems with certain file formats
- 🐛 Blurry document rendering
- 🐛 Unreliable cloud/network connectivity

**Reported bugs**

- App closing unexpectedly when using certain features
- Inability to open large files without crashing
- Inconsistent file handling and naming

**Requested features**

- Advanced video player controls (fast forward, slow motion, zoom)
- Basic image editing tools
- Improved file/folder organization and naming
- Integration with more cloud storage services


### Strongbox Zero

[App page](https://appshunter.io/ios/app/strongbox-zero/id1581589638)

This app securely stores and protects your passwords with a master password. It supports open-source formats and offers advanced security features like biometric unlock and hardware token protection. It's designed for users who prefer a local-only password management solution.

**Highlights:** Local-only password storage, Biometric and PIN unlock, YubiKey hardware token protection, Military-grade cryptography, Password auditing for weak passwords, Secure document attachment viewer, Import/Export via Files app and Email

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

**In-app purchases:** none


## Frequently asked questions

### Is USB Disk Pro free?

USB Disk Pro costs $99.99, with no in-app purchases.

### Is Strongbox Zero free?

Strongbox Zero costs $99.99, with no in-app purchases.

### Which has better reviews, USB Disk Pro or Strongbox Zero?

USB Disk Pro is rated higher. USB Disk Pro averages 4.5 out of 5 from 142 ratings, while Strongbox Zero averages 4.3 from 21 ratings.

### Do USB Disk Pro or Strongbox Zero have ads?

Neither USB Disk Pro nor Strongbox Zero shows ads.

### Which is updated more often, USB Disk Pro or Strongbox Zero?

USB Disk Pro ships an update every 3 months, and Strongbox Zero every 2 weeks. Most recently, USB Disk Pro was updated on October 22, 2026 and Strongbox Zero on October 23, 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.*