USB vs Keyboard DFU Tool
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
USB
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.
- 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
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USB-Connect is a commissioning, diagnostic and service tool consisting of a Bluetooth Adaptor and mobile device app. The app communicates with any U.S. Boiler modulating condensing boiler. USB-Connect is a local service tool with web portal data collection and live streaming to enable remote support. Compatible Boilers include Alpine, Alta, AltaC, Aspen, AspenC, K2WT, K2WTC, K2FT and XC Modulating Condensing Boilers. USB-Connect Features: • Bluetooth Adaptor connects boiler to USB-Connect App. • English and Spanish Language. • Start-up, Troubleshoot and Service Wizards. • Data logs, site photos, service & status reports sent to cloud. • Alta Boiler Control firmware and default parameter updates.
Keyboard DFU Tool
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.
- Automatic Bluetooth keyboard firmware upgrade
- Search and identify iPad Bluetooth keyboards
- Automatic firmware download
- User-selected firmware installation
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This application mainly provides automatic upgrade of Bluetooth keyboard firmware . Its main function is to search and identify the iPad Bluetooth keyboard， automatically download firmware according to the user's selection ，then upgrade the keyboard.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | USB | Keyboard DFU Tool |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.4 (16 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 75.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 16 — better | 1 |
| Update frequency | Monthly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 74 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | U.S. Boiler Company, LLC. | 赵杰 李 |
Customer experience
USB
Keyboard DFU Tool
In-app purchases
USB
No in-app purchases
Keyboard DFU Tool
No in-app purchases
