# Drill Calc vs USB Sharp Pro

Drill Calc and USB Sharp Pro both sit at 4.1 stars, but that hides the real split: 92% of Drill Calc's written reviews are positive against 60% of USB Sharp Pro's. USB Sharp Pro's advantage is update cadence (every 2 months vs every 18 months). On price, rating, ratings volume and ads there is nothing between them.

Drill Calc costs $2.99 and USB Sharp Pro $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.1 for Drill Calc against 4.0 for USB Sharp Pro. Both are backed by a comparable volume of ratings — 19 and 12 respectively. Written reviews are what separate them: 92% of Drill Calc's written reviews are positive against 60% of USB Sharp Pro's.

Drill Calc ships an update every 18 months, USB Sharp Pro every 2 months. The most recent releases landed on August 12, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Drill Calc | USB Sharp Pro |
| --- | --- | --- |
| Price | $2.99 | $2.99 |
| Rating | **[4.1 (19 ratings)](https://appshunter.io/ios/app/drill-calc/id304434324/reviews)** | [4.0 (12 ratings)](https://appshunter.io/ios/app/usb-sharp-pro/id436590784/reviews) |
| Number of ratings | **19** | 12 |
| Positive reviews | **91.7% of reviews** | 59.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Size | 5 MB | 52 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Black Cat Systems](https://appshunter.io/developer/301047032) | [锦文 游](https://appshunter.io/developer/406832160) |

## What reviewers say

### Drill Calc

[App page](https://appshunter.io/ios/app/drill-calc/id304434324)

This utility app helps you determine the correct drill bit size for threaded holes. It supports both inch and metric threads, calculates close and tight fit hole sizes, and provides tables for standard drill bit sizes and pipe information.

**Highlights:** Calculates drill bit size for threaded holes, Supports inch and metric threads, Displays close and tight fit hole sizes, Includes standard inch fractional and numeric drill bit tables, Provides pipe size information, Offers data on common wood screw sizes

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

**In-app purchases:** none


### USB Sharp Pro

[App page](https://appshunter.io/ios/app/usb-sharp-pro/id436590784)

Transform your iPhone or iPad into a portable wireless storage disk for efficient file management.  Supports a wide range of file types for viewing, editing, and transferring via Wi-Fi or iTunes.

**Highlights:** Wireless storage disk, File management, Wi-Fi transfer, iTunes file sharing, Document reader, E-book reader, Music player

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

**In-app purchases:** none


## Frequently asked questions

### Is Drill Calc free?

Drill Calc costs $2.99, with no in-app purchases.

### Is USB Sharp Pro free?

USB Sharp Pro costs $2.99, with no in-app purchases.

### Which has better reviews, Drill Calc or USB Sharp Pro?

Drill Calc is rated higher. Drill Calc averages 4.1 out of 5 from 19 ratings, while USB Sharp Pro averages 4.0 from 12 ratings.

### Do Drill Calc or USB Sharp Pro have ads?

Neither Drill Calc nor USB Sharp Pro shows ads.

### Which is updated more often, Drill Calc or USB Sharp Pro?

Drill Calc ships an update every 18 months, and USB Sharp Pro every 2 months. Most recently, Drill Calc was updated on August 12, 2026 and USB Sharp Pro on September 22, 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.*