Comparison

Drill Calc vs USB Sharp Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Drill Calc

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
Read full description

Need to find the right drill bit size for a hole? Drill Calc calculates the correct drill bit size to use for threaded holes, based on the bolt (tap) diameter and thread pitch and percentage, for both inch and metric threads. Close and tight fit hole sizes for many popular drill sizes are also displayed. It also has tables of standard inch fractional and numeric drill bit sizes, as well as complete information for various pipe sizes. There is also detailed information about the commonly used sizes of wood screws. Buy your copy of Drill Calc today, and put away your drill chart.

About

USB Sharp Pro

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
Read full description

USB Sharp Pro can turn your iPhone, ipad, ipod into a large Capacity, Portable and Wireless storage disk, Facilitate and efficient manage of your files! ------------------------------------ V1.2.2 Updates 1.Support for editing php, js, html file. 2.Support the open format, such as flv,asf,rmvb,avi,mpg,mkv,wmv. ------------------------------------ V1.2.0 Updates 1. Dropbox Operate, multiple files upload & download, history,create folder 2. Add manual ------------------------------------ V1.1.3 Updates 1.Chrome and Firefox Supported upload multiple files 2.Extract files from encryption .rar ------------------------------------ V1.1.2 Updates ** Optimization pdf reader, ** Support for importing videos/photos to Photo Library ** Support for exporting video from Photo Library ------------------------------------ V1.1.1 Updates ** Search file(folder) name function added ** Picture Viewer Improved ** Unzip type added ------------------------------------ V1.1.0 Updates New Features: ** add authentication for local login ** add authentication for wifi transfer ** Custom background image; ** Sorting by file size **** Build-in Music Player [Support .mp3 .m4a .aac] ** Background playing; ** Sorting by song title, artist name and album name in the playlists ** Support many kinds of playing modes ** Support playing the music inside iPod ** Custom background image; ** Support searching lyrics on-line and showing it in synchronization , and support the lyrics duplication ** Support lyrics edit; ------------------------------------ V1.0.1 Updates * Full screen view files Supported * Multiple photo import Supported Specifically as follows: **** Facilitate and efficient manage files * Sorting by file name、create time and file type * View, copy, move, delete, rename, email, zip Compression and unzip files/folders * Encryption folder, protect your files * Extract all files from a compressed .zip file * Glide deleting function * Select all and Cancel all operate * Transferring files by wifi and iTunes file sharing * Email multiple files, folder Supported * Open email attachments * Photo import Supported * Open files in other applications * Landscape mode supported * iPad-compatible **** Facilitate and efficient view files * E-book reader (.epub) * Thumbnail preview, Photo View, Zoom * Players, support mp3、m4a、aac and mp4 * Document reader, support .pdf .rtf .rtfd .doc .docx etc * Multi-touch Supported, Zoom files * Bookmark supported, fast file location **** Facilitate and efficient edit plain files * Convert plain file encoding (Unicode,UTF-8 etc) * Plain file content copy, cut, paste and replace * External file copy and paste **** Add plain text(default encoding UTF-8), photos(from Camera) and folders **** Support Simplified Chinese and English USB Sharp Pro support list of file types: E-book: epub Plain text: .txt .php .js .html Document: .pdf .csv .rtf .rtfd .doc .docx .xls .xlsx .ppt .pptx (office 2003 or later) Image: .png .jpg .jpeg .gif .bmp .xbm .tif .tiff Audio: .mp3 .m4a .aac Video: .mp4 .mov .m4v .3gp .flv .asf .rmvb .avi .mpg .mkv .wmv Web: .htm .html .xhtml Compressed: .zip .rar

Screenshots

Drill Calc4 screens
USB Sharp Pro2 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 8 level
Drill Calc versus USB Sharp Pro: the parameters behind the verdict, then further details
ParameterDrill CalcUSB Sharp Pro
Price$2.99$2.99
Rating4.1 (19 ratings) — better4.0 (12 ratings)
Positive reviews91.7% of reviews — better59.6% of reviews
Number of ratings19 — better12
Update frequencyEvery 18 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13.0
Further details — not scored
Size5 MB52 MB
Age rating4+4+
DeveloperBlack Cat Systems锦文 游

Customer experience

Drill Calc

All ratings19 ratings
Positive78.9%
Neutral5.3%
Negative15.8%
Written reviews12 reviews
Positive91.7%
Neutral0.0%
Negative8.3%

USB Sharp Pro

All ratings12 ratings
Positive75.0%
Neutral8.3%
Negative16.7%
Written reviews104 reviews
Positive59.6%
Neutral7.7%
Negative32.7%

In-app purchases

None

Drill Calc

No in-app purchases

None

USB Sharp Pro

No in-app purchases

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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