# USB vs Keyboard DFU Tool

The clearest difference is price: USB at Free against Keyboard DFU Tool's $0.99. USB also leads on ratings volume (16 vs 1). Keyboard DFU Tool's advantage is rating (5.0 vs 4.4) and update cadence (every 2 days vs monthly). On ads, in-app purchases, monetization model and device support there is nothing between them.

USB is free to download; Keyboard DFU Tool costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Keyboard DFU Tool holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: USB has 16 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 75% of USB's written reviews are positive against 100% of Keyboard DFU Tool's.

USB ships an update monthly, Keyboard DFU Tool every 2 days. The most recent releases landed on October 24, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | USB | Keyboard DFU Tool |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [4.4 (16 ratings)](https://appshunter.io/ios/app/usb-connect/id1563292212/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/keyboard-dfu-tool/id1601924148/reviews)** |
| Number of ratings | **16** | 1 |
| Positive reviews | 75.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | Free | Free |
| Size | 74 MB | 12 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [U.S. Boiler Company, LLC.](https://appshunter.io/developer/608292333) | [赵杰 李](https://appshunter.io/developer/1560760447) |

## What reviewers say

### 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


### Keyboard DFU Tool

[App page](https://appshunter.io/ios/app/keyboard-dfu-tool/id1601924148)

This utility app automatically upgrades the firmware for Bluetooth keyboards connected to iPads. It searches for and identifies compatible keyboards, then downloads and installs the appropriate firmware based on user selection.

**Highlights:** Automatic Bluetooth keyboard firmware upgrade, Search and identify iPad Bluetooth keyboards, Automatic firmware download, User-selected firmware installation

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is USB free?

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

### Is Keyboard DFU Tool free?

Keyboard DFU Tool costs $0.99, with no in-app purchases.

### Which has better reviews, USB or Keyboard DFU Tool?

Keyboard DFU Tool is rated higher. USB averages 4.4 out of 5 from 16 ratings, while Keyboard DFU Tool averages 5.0 from 1 ratings.

### Do USB or Keyboard DFU Tool have ads?

Neither USB nor Keyboard DFU Tool shows ads.

### Which is updated more often, USB or Keyboard DFU Tool?

USB ships an update monthly, and Keyboard DFU Tool every 2 days. Most recently, USB was updated on October 24, 2026 and Keyboard DFU Tool on October 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.*