# TC66C vs Diskio

The clearest difference is price: TC66C at Free against Diskio's $5.99. TC66C also leads on ads (none vs shown) and iOS requirement (9.0 vs 16.0). Diskio's advantage is rating (3.9 vs 2.0) and update cadence (weekly vs every 2 months). On ratings volume, in-app purchases and device support there is nothing between them.

TC66C is free to download; Diskio costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Diskio holds the better App Store score, 3.9 against 2.0. Both are backed by a comparable volume of ratings — 6 and 17 respectively. Written reviews point the same way: 33% of TC66C's written reviews are positive against 44% of Diskio's.

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

## The numbers

| Metric | TC66C | Diskio |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| Rating | [2.0 (6 ratings)](https://appshunter.io/ios/app/tc66c/id1445111707/reviews) | **[3.9 (17 ratings)](https://appshunter.io/ios/app/diskio-disk-and-ssd-speed-test/id6467768299/reviews)** |
| Number of ratings | 6 | **17** |
| Positive reviews | 33.3% of reviews | **44.4% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | **Free** | Paid |
| Size | 37 MB | 9 MB |
| Requires iOS | **9.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [亮亮 刘](https://appshunter.io/developer/1439150212) | [Sergii Khliustin](https://appshunter.io/developer/1598605990) |

## 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


### Diskio

[App page](https://appshunter.io/ios/app/diskio-disk-and-ssd-speed-test/id6467768299)

This utility app provides precise speed tests for all your storage devices, from internal iPhone storage to external USB drives. Customize test parameters for detailed insights and identify performance bottlenecks. It offers a simple three-step process to analyze your storage's true capabilities.

**Highlights:** Precise disk speed testing, Tests internal and external storage, Customizable test parameters, Simple three-step process, Universally compatible with iOS devices, Identifies performance bottlenecks

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

**In-app purchases:** none


## Frequently asked questions

### Is TC66C free?

TC66C is free to download, with no in-app purchases.

### Is Diskio free?

Diskio costs $5.99, with no in-app purchases.

### Which has better reviews, TC66C or Diskio?

Diskio is rated higher. TC66C averages 2.0 out of 5 from 6 ratings, while Diskio averages 3.9 from 17 ratings.

### Do TC66C or Diskio have ads?

Diskio shows ads; TC66C does not.

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

TC66C ships an update every 2 months, and Diskio weekly. Most recently, TC66C was updated on October 16, 2026 and Diskio 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.*