Comparison

USB Disk Pro vs Unit Converter All

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

Head to head
About

USB Disk Pro

Manage and view documents on your iPhone and iPad with this powerful file manager. It offers a built-in viewer, easy file transfers via iTunes or Wi-Fi, and supports numerous cloud services. Secure your files with encryption and access them from various locations.

Highlights
  • Store and view files
  • Built-in document viewer
  • iTunes and Wi-Fi file transfers
  • Cloud service integration
  • File encryption and protection
  • Supports Files app
Features
Read full description

USB Disk Pro lets you store, view and manage documents on your iPhone and iPad. It has an amazing built in document viewer and is very easy to use, with a simple and intuitive interface, yet it contains many powerful features. Drag and drop files in iTunes to transfer them to your iPhone / iPad, then view them anywhere! TUAW - "USB Disk is [...] a nicely designed one." Lifehacker - "The Best. USB Disk for iOS gives you a fast and easy way to transfer documents and images to your device." Apple - "New and Noteworthy" TOP REASONS TO BUY • Store and view files. • Open multiple documents in different pages. • Restores last viewing position. • Navigate using swipes (like Photos / iBooks app). • Thumbnails let you preview your files. • Protect & encrypt files using Apple's Data Protection. • Supports the Files application (file provider for iOS 11+). MORE FEATURES • View and download email attachments. • Full screen file viewer. • Copy, paste, cut, delete and create files. • USB file transfers. • File transfers without iTunes over WiFi. • TV / VGA out. • Slideshow with adjustable delay. • Fast scrolling, page up/down functionalities. • Email your documents. • Lock code. • Download web files. • In app web browser. • Storage provider for other apps. • Background audio. BROWSING LOCATIONS • Local files. • Dropbox. • Google Drive. • OneDrive, SharePoint. • Box. • Evernote. • WebDAV and WWW servers. • FTP, SFTP servers. • Device's Photo Library. READING FILE TYPES • PDF files. • Compressed files (zip, rar). • MS Office documents. • iWork documents. • Pictures (jpg, png, gif, ...). • eBooks (pdf, ePub, html, txt, ...). • Comics (cbr, cbz, pdf, ...). • Audio files (mp3, m4a, wav, ...). • Video files (m4v, mov, avi, mkv, ...). EDITING FILE TYPES • ZIP files. • Small txt files. • PDF annotations. UPDATES Buy now and get free updates.

About

Unit Converter All

Easily convert between a vast array of US, imperial, and metric units across multiple categories including length, area, volume, weight, and temperature. This comprehensive tool supports numerous specific units within each conversion type.

Highlights
  • Length conversion
  • Area conversion
  • Volume conversion
  • Weight conversion
  • Temperature conversion
  • Speed conversion
  • Power conversion
  • Pressure conversion
Features
Read full description

A handy app to convert between US, imperial and metric units: Length Converter, Area Converter, Time converter, Temperature converter, Weight Converter, Volume Converter, Speed Converter, Power Converter, Pressure Converter, Energy Converter, Fabric Converter, Fuel consumption converter. Length Converter Supported length units: • Mil • Point • Pica • Inch • Foot • Yard • Mile • Mile (nautical) • Kilometer • Meter • Decimeter • Centimeter • Millimeter Area Converter Supported area units: • Square Mil • Square Inch • Square Foot • Square Yard • Square • Acre  • Square Mile • Square Millimeter • Square Centimeter • Square Decimeter • Square Meter • Are • Hectare • Square Kilometer Time converter Supported time units: • Nanosecond • Microsecond • Millisecond • Second • Minute • Hour • Day • Week • Month • Year • Decade • Century Temperature converter Supported temperature units: • Celsius °C • Fahrenheit °F • Kelvin K Weight Converter Supported mass units: • Ounce (US) • Troy Ounce • Pound (US) • Stone • Short Ton (US) • Long Ton (UK) • Microgram • Milligram • Gram • Kilogram • Quintal/Centner • Metric Ton Volume Converter Supported volume units: US volume units: • Barrel (petroleum) • Barrel (fluid) • Barrel (beer) • US liquid gallon • US liquid quart • US liquid pint • US cup • US gill • US fluid ounce • US tablespoon • US teaspoon • US fluid dram • Cubic foot • Board Foot • Cubic inch Imperial volume units: • Barrel (petroleum) • Barrel • Imperial gallon • Imperial quart • Imperial pint • Imperial cup • Imperial gill • Imperial fluid ounce • Imperial tablespoon • Imperial teaspoon • Imperial drachm • Cubic foot • Board Foot • Cubic inch Metric volume units: • Сubic meter • Сubic decimeter • Сubic centimeter • Сubic millimeter • Liter • Deciliter • Centiliter • Milliliter Speed Converter Supported speed units: • Miles per hour (mi/h or mph) • Miles per minute (mi/min) • Miles per second (mi/s) • Yards per hour (yd/h or yph) • Yards per second (yd/s) • Feet per minute (fpm or ft/min) • Feet per second (fps or ft/s) • Inches per second (ips) • Knots or nautical miles per hour (kn or kt) • Kilometers per hour (km/h or kph) • Kilometers per minute (km/min) • Kilometers per second (km/s) • Meters per minute (m/min) • Meters per second (m/s) Power Converter Supported power units: • Watt • Kilowatt • Megawatt • Horsepower (electric) hp(E) • Horsepower (metric) hp(M) • Foot-Pounds per hour (ft-lbf/h) • Foot-Pounds per minute (ft-lbf/min) • Foot-Pounds per second (ft-lbf/s) • Btu per minute (Btu/min) • Erg per second (Erg/s) Pressure Converter Supported pressure units: • Atmosphere • Millibar • Bar • Pascal • Hectopascal • Kilopascal • Megapascal • Pounds per square inch (PSI) • Pounds per square foot (PSF) • Kilograms per square meter kgf/m² • Inches of mercury (inHg) • Millimeters of mercury (mmHg) • Torr Energy Converter Supported energy units: • Joule • Kilojoule • Calorie • Kilocalorie • Megacalorie • Gigacalorie • Watt hour • Kilowatt hour • Megawatt hour • Electronvolt • British thermal unit (BTU) • Therm (US) • Foot pound Fabric Converter You can easily convert: - Grams per Square Meter (g/m2) to Ounces per Square Yard (oz/yd2). - Ounces per Square Yard (oz/yd2) to Grams per Square Meter (g/m2). Fuel consumption converter Supported units: Kilometers per liter (km/L) Liters per 100 kilometers (L/100 km) Miles per gallon (US) (US MPG) Miles per gallon (UK) (UK MPG) - Flip button to easily switch between the "from" and "to" units. - You can enter the value as a decimal or as a fraction. - Rounding to specified number of decimal places (0-8). By default, the app displays 2 decimal places. - For fractions, you can select rounding to the nearest 1/2, 1/4, 1/8, 1/12, 1/16, 1/32, 1/64, 1/128, 1/256. By default, the app rounds fractions to the nearest 1/32. - Sends results via email. - Different formats to show results: Fractions + Decimal numbers, Auto, Fractions, Decimals.

Screenshots

USB Disk Pro4 screens
Unit Converter All4 screens

Verdict

The call

The clearest difference is price: Unit Converter All at $9.99 against USB Disk Pro's $99.99. Unit Converter All also leads on review sentiment (80% vs 66%) and iOS requirement (12.0 vs 16.0). USB Disk Pro's advantage is rating (4.5 vs 4.3) and ratings volume (142 vs 7). On update cadence, ads, in-app purchases and monetization model 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

USB Disk Pro costs $99.99 and Unit Converter All $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

USB Disk Pro holds the better App Store score, 4.5 against 4.3. That said, the two scores are not equally well evidenced: USB Disk Pro has 142 ratings behind it against 7, so its average is the more settled of the two. Written reviews complicate that: 66% of USB Disk Pro's written reviews are positive against 80% of Unit Converter All's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

USB Disk Pro ships an update every 2 months, Unit Converter All every 3 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

Scorecard5 real differences · 5 level
USB Disk Pro versus Unit Converter All: the parameters behind the verdict, then further details
ParameterUSB Disk ProUnit Converter All
Price$99.99$9.99 — better
Rating4.5 (142 ratings) — better4.3 (7 ratings)
Positive reviews65.6% of reviews80.0% of reviews — better
Number of ratings142 — better7
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, Apple TV, Apple WatchiPhone, iPad, iPod, Mac
Requires iOS16.012.0 — better
Further details — not scored
Size215 MB13 MB
Age rating17+4+
DeveloperImesart S.a.r.l.Intemodino Group s.r.o.

Customer experience

USB Disk Pro

All ratings142 ratings
Positive89.4%
Neutral4.2%
Negative6.3%
Written reviews607 reviews
Positive65.6%
Neutral11.9%
Negative22.6%

Unit Converter All

All ratings7 ratings
Positive85.7%
Neutral0.0%
Negative14.3%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

Bugs and requests

USB Disk Pro

Reported bugs

3 issues
  • App closing unexpectedly when using certain features
  • Inability to open large files without crashing
  • Inconsistent file handling and naming

Requested features

4 requests
  • Advanced video player controls (fast forward, slow motion, zoom)
  • Basic image editing tools
  • Improved file/folder organization and naming
  • Integration with more cloud storage services

Unit Converter All

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

USB Disk Pro

No in-app purchases

None

Unit Converter All

No in-app purchases

Questions

Is USB Disk Pro free?
USB Disk Pro costs $99.99, with no in-app purchases.
Is Unit Converter All free?
Unit Converter All costs $9.99, with no in-app purchases.
Which has better reviews, USB Disk Pro or Unit Converter All?
USB Disk Pro is rated higher. USB Disk Pro averages 4.5 out of 5 from 142 ratings, while Unit Converter All averages 4.3 from 7 ratings.
Do USB Disk Pro or Unit Converter All have ads?
Neither USB Disk Pro nor Unit Converter All shows ads.
Which is updated more often, USB Disk Pro or Unit Converter All?
USB Disk Pro ships an update every 2 months, and Unit Converter All every 3 months. Most recently, USB Disk Pro was updated on October 29, 2026 and Unit Converter All on October 24, 2026.

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