Unit Converter All vs Strongbox Zero
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Length conversion
- Area conversion
- Volume conversion
- Weight conversion
- Temperature conversion
- Speed conversion
- Power conversion
- Pressure conversion
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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.
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.
- 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
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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
Verdict
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
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.
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.
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.
| Parameter | Unit Converter All | Strongbox Zero |
|---|---|---|
| Price | $9.99 — better | $99.99 |
| Rating | 4.3 (7 ratings) | 4.3 (21 ratings) — better |
| Positive reviews | 80.0% of reviews — better | 75.0% of reviews |
| Number of ratings | 7 | 21 — better |
| Update frequency | Every 3 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod, Mac | iPhone, iPad, iPod, Mac, Apple Watch — better |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 13 MB | 96 MB |
| Age rating | 4+ | 4+ |
| Developer | Intemodino Group s.r.o. | Phoebe Code Limited |
Customer experience
Unit Converter All
Strongbox Zero
In-app purchases
Unit Converter All
No in-app purchases
Strongbox Zero
No in-app purchases
Questions
Is Unit Converter All free?
Is Strongbox Zero free?
Which has better reviews, Unit Converter All or Strongbox Zero?
Do Unit Converter All or Strongbox Zero have ads?
Which is updated more often, Unit Converter All or Strongbox Zero?
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