Comparison

Unit Converter All vs Strongbox Zero

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

Head to head
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.

About

Strongbox Zero

This app securely stores and protects your passwords with a master password. It supports open-source formats and offers advanced security features like biometric unlock and hardware token protection. It's designed for users who prefer a local-only password management solution.

Highlights
  • Local-only password storage
  • Biometric and PIN unlock
  • YubiKey hardware token protection
  • Military-grade cryptography
  • Password auditing for weak passwords
  • Secure document attachment viewer
  • Import/Export via Files app and Email
Features
Read full description

Strongbox Zero is a version of the well known and loved Strongbox with all of the networking code and as many third party libraries stripped out as we could! Think of it as the Drag Racer version of Strongbox! If you're a fan of Local Only password managers this could be the right choice for you. We recommend you get to know (and love!) the regular Strongbox first through the Freemium app. Once you're happy and sure you want to go local only, go for Strongbox Zero... Strongbox Zero is an application for keeping all your passwords safely stored and protected by one master password. Supporting the open source Password Safe and KeePass formats. *** Features *** - Face ID/Touch ID Unlock for the ultimate in convenience, security and speed. - PIN Code Unlock with a Duress PIN option for those tricky situations. - YubiKey protection - secure your databases with a hardware token. - Secure - protected by time tested military grade cryptography. - Private - Isolated In-App attachments viewer for your sensitive documents, photos & videos. - Audit your passwords - Automatically check your database for weak passwords - Search your entire set of passwords and secrets instantly and powerfully, with deep search. Autocomplete new entries, and auto generate secure passwords. - Compatible - Import/Export by Files app, Email, CSV, iTunes File Sharing - Standards compliant - using the time tested Password Safe and KeePass formats so you can import any existing password safe you have. - Features galore - Incredibly configurable password generation including Diceware (XKCD) & regular passwords. - Timed Auto Clear Clipboard. - Entry History. - KeePass Field References, Tags & Custom Icons. - Two Factor Authentication codes (TOTP) - QR Code, Steam & Manual. --------------------------------------------------------------------- • Payment will be charged to iTunes Account at confirmation of purchase • Strongbox Privacy Policy may be found here: https://strongboxsafe.com/privacy-policy/ • Strongbox Terms of Use may be found here: https://strongboxsafe.com/terms/

Screenshots

Unit Converter All4 screens
Strongbox Zero4 screens

Verdict

The call

The clearest difference is price: Unit Converter All at $9.99 against Strongbox Zero's $99.99. Unit Converter All also leads on iOS requirement (12.0 vs 15.0). Strongbox Zero's advantage is update cadence (every 2 weeks vs every 3 months) and ratings volume (21 vs 7). On rating, review sentiment, ads and in-app purchases 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

Unit Converter All costs $9.99 and Strongbox Zero $99.99 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 — 4.3 for Unit Converter All against 4.3 for Strongbox Zero. Both are backed by a comparable volume of ratings — 7 and 21 respectively. Written reviews are what separate them: 80% of Unit Converter All's written reviews are positive against 75% of Strongbox Zero's.

UpkeepUpdate frequency

Unit Converter All ships an update every 3 months, Strongbox Zero every 2 weeks. The most recent releases landed on October 24, 2026 and November 3, 2026 respectively.

Scorecard4 real differences · 6 level
Unit Converter All versus Strongbox Zero: the parameters behind the verdict, then further details
ParameterUnit Converter AllStrongbox Zero
Price$9.99 — better$99.99
Rating4.3 (7 ratings)4.3 (21 ratings) — better
Positive reviews80.0% of reviews — better75.0% of reviews
Number of ratings721 — better
Update frequencyEvery 3 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod, MaciPhone, iPad, iPod, Mac, Apple Watch — better
Requires iOS12.0 — better15.0
Further details — not scored
Size13 MB96 MB
Age rating4+4+
DeveloperIntemodino Group s.r.o.Phoebe Code Limited

Customer experience

Unit Converter All

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

Strongbox Zero

All ratings21 ratings
Positive85.7%
Neutral0.0%
Negative14.3%
Written reviews20 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

In-app purchases

None

Unit Converter All

No in-app purchases

None

Strongbox Zero

No in-app purchases

Questions

Is Unit Converter All free?
Unit Converter All costs $9.99, with no in-app purchases.
Is Strongbox Zero free?
Strongbox Zero costs $99.99, with no in-app purchases.
Which has better reviews, Unit Converter All or Strongbox Zero?
Strongbox Zero is rated higher. Unit Converter All averages 4.3 out of 5 from 7 ratings, while Strongbox Zero averages 4.3 from 21 ratings.
Do Unit Converter All or Strongbox Zero have ads?
Neither Unit Converter All nor Strongbox Zero shows ads.
Which is updated more often, Unit Converter All or Strongbox Zero?
Unit Converter All ships an update every 3 months, and Strongbox Zero every 2 weeks. Most recently, Unit Converter All was updated on October 24, 2026 and Strongbox Zero on November 3, 2026.

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