# i vs USB

The clearest difference is review sentiment: USB at 75% against i's 15%. USB also leads on rating (4.2 vs 2.3) and update cadence (monthly vs every 3 months). i's advantage is ratings volume (789 vs 16) and iOS requirement (8.0 vs 13.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

USB holds the better App Store score, 4.2 against 2.3. That said, the two scores are not equally well evidenced: i has 789 ratings behind it against 16, so its average is the more settled of the two. Written reviews point the same way: 15% of i's written reviews are positive against 75% of USB's.

i ships an update every 3 months, USB monthly. The most recent releases landed on August 24, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | i | USB |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (789 ratings)](https://appshunter.io/ios/app/i-flashdevice/id1100496131/reviews) | **[4.2 (16 ratings)](https://appshunter.io/ios/app/usb-connect/id1563292212/reviews)** |
| Number of ratings | **789** | 16 |
| Positive reviews | 15.0% of reviews | **75.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free | Free |
| Size | 89 MB | 74 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ShenZhen 0101 Technology Co.,Ltd](https://appshunter.io/developer/994444596) | [U.S. Boiler Company, LLC.](https://appshunter.io/developer/608292333) |

## What reviewers say

### i

[App page](https://appshunter.io/ios/app/i-flashdevice/id1100496131)

Easily manage all your files on iOS devices. Transfer documents, photos, music, and videos between different devices and platforms. Offers backup for contacts and camera roll, and supports a wide range of file formats.

**Highlights:** File management for iOS, Cross-platform file exchange, Backup contacts and camera roll, Play videos and music, Preview images, Supports wide file formats

**In-app purchases:** none

**What reviewers like**

- ⭐ Cool app
- 🚀 Able to transfer files directly
- 📸 Can take photos/videos within the app
- 🗄️ Useful for backing up files

**What reviewers complain about**

- 🐛 Crashes frequently
- ⚠️ Doesn't work with newer devices/iOS versions
- 🤖 Poor software quality and buggy
- 🔌 Drains device battery quickly
- 📂 Issues with file management and deletion

**Reported bugs**

- App crashes on launch
- Unable to connect to device
- Corrupted files after transfer
- Inconsistent behavior when viewing media

**Requested features**

- Add support for more file types
- Improve video playback functionality
- Provide better instructions and troubleshooting
- Optimize app for latest iOS versions


### USB

[App page](https://appshunter.io/ios/app/usb-connect/id1563292212)

This tool connects to U.S. Boiler modulating condensing boilers via a Bluetooth adapter for commissioning, diagnostics, and service. It offers wizards for startup and troubleshooting, data logging, and remote support capabilities through a web portal.

**Highlights:** Bluetooth connectivity to boilers, Commissioning, diagnostic, and service functions, Startup, troubleshoot, and service wizards, Cloud data logging and reporting, Remote support via web portal, Boiler firmware and parameter updates

**In-app purchases:** none


## Frequently asked questions

### Is i free?

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

### Is USB free?

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

### Which has better reviews, i or USB?

USB is rated higher. i averages 2.3 out of 5 from 789 ratings, while USB averages 4.2 from 16 ratings.

### Do i or USB have ads?

Neither i nor USB shows ads.

### Which is updated more often, i or USB?

i ships an update every 3 months, and USB monthly. Most recently, i was updated on August 24, 2026 and USB on September 8, 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.*