# U vs Sound dB detector

The clearest difference is iOS requirement: U at 12.1 against Sound dB detector's 16.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | U | Sound dB detector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.3 (17 ratings)](https://appshunter.io/ios/app/u-disk/id1119397038/reviews)** | — |
| Number of ratings | **17** | — |
| Positive reviews | 29.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | Free | — |
| Size | 52 MB | 18 MB |
| Requires iOS | **12.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [岚 丁](https://appshunter.io/developer/1465584117) | [Kere Tech](https://appshunter.io/developer/1582785881) |

## What reviewers say

### U

[App page](https://appshunter.io/ios/app/u-disk/id1119397038)

Expand your iOS device's storage with this portable flash drive. Seamlessly transfer, view, and manage files between your iPhone/iPad and Mac/PC without needing Wi-Fi or a network signal. Features include file encryption and contact backup.

**Highlights:** Memory expansion for iOS devices, Two-way storage transfer (iOS to Mac/PC), No Wi-Fi or network signal required, Transfer, view, and share files, File encryption, Contacts backup and restore, Video streaming via Airplay

**In-app purchases:** none


### Sound dB detector

[App page](https://appshunter.io/ios/app/sound-db-detector/id6808588097)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is U free?

U is free to download, with no in-app purchases.

### Is Sound dB detector free?

Sound dB detector is free to download, with no in-app purchases.

### Do U or Sound dB detector have ads?

Neither U nor Sound dB detector shows ads.

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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.*