# TC66C vs USB

The clearest difference is rating: USB at 4.4 against TC66C's 2.0. USB also leads on review sentiment (75% vs 33%) and update cadence (monthly vs every 2 months). TC66C's advantage is iOS requirement (9.0 vs 13.0). On price, ratings volume, ads and in-app purchases 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, 4.4 against 2.0. Both are backed by a comparable volume of ratings — 6 and 16 respectively. Written reviews point the same way: 33% of TC66C's written reviews are positive against 75% of USB's.

TC66C ships an update every 2 months, USB monthly. The most recent releases landed on October 16, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | TC66C | USB |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (6 ratings)](https://appshunter.io/ios/app/tc66c/id1445111707/reviews) | **[4.4 (16 ratings)](https://appshunter.io/ios/app/usb-connect/id1563292212/reviews)** |
| Number of ratings | 6 | **16** |
| Positive reviews | 33.3% of reviews | **75.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | Free |
| Size | 37 MB | 74 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [亮亮 刘](https://appshunter.io/developer/1439150212) | [U.S. Boiler Company, LLC.](https://appshunter.io/developer/608292333) |

## What reviewers say

### TC66C

[App page](https://appshunter.io/ios/app/tc66c/id1445111707)

Connect to a Type-C tester via Bluetooth to view and control its data. This utility app allows for real-time monitoring and management of tester functions directly from your device.

**Highlights:** Bluetooth connectivity, Type-C tester data display, Tester control functions, Real-time monitoring

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 TC66C free?

TC66C 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, TC66C or USB?

USB is rated higher. TC66C averages 2.0 out of 5 from 6 ratings, while USB averages 4.4 from 16 ratings.

### Do TC66C or USB have ads?

Neither TC66C nor USB shows ads.

### Which is updated more often, TC66C or USB?

TC66C ships an update every 2 months, and USB monthly. Most recently, TC66C was updated on October 16, 2026 and USB on October 24, 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.*