Comparison

UNITS MASTER vs Scale

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

Head to head
About

UNITS MASTER

This app is a comprehensive unit conversion calculator for length, distance, and area. It supports a vast array of US and metric units, offering both fractional and decimal calculations with customizable rounding. Users can also perform complex mathematical operations and access a calculation history.

Highlights
  • Extensive US and metric unit support
  • Fractional and decimal calculations
  • Customizable rounding precision
  • Complex calculation capabilities
  • Calculation history and sharing
  • Multiple output formats
Features
Read full description

Innovative unit conversion calculator. Get instant help with unit calculation and conversion! UNITS MASTER is a universal unit conversion calculator that allows you to instantly calculate and convert US and metric units of length, distance and area. SUPPORTED DISTANCE AND LENGTH UNITS: US/imperial units: mils, points, picas, inches, links, feet, yards, rods, chains, furlongs, miles, fathoms, nautical miles. Metric units: millimeters, centimeters, decimeters, meters, kilometers. SUPPORTED AREA UNITS: US/imperial units: square mils, square inches, square links, square feet, square yards, squares, square rods, square chains, acres, square miles, townships. Metric units: square millimeters(mm²), square centimeters(cm²), square decimeters(dm²), square meters(m²), ares, hectares, square kilometers(km²). LENGTH AND AREA UNIT CALCULATOR: - Calculates any combination of supported US and metric length and area units. - Performs calculation in fractions and decimals. - Complex calculations. - Easy fraction input. - Instantly converts results between different units. - Displays results in fractional and decimal forms. - Shows answer in any supported unit(s). LENGTH AND AREA UNIT CONVERTER: - 1000+ conversion combinations. - Converts units between US and metric systems. - Converts between units within the same system. - Converts between fractions and decimals. ROUND RESULTS TO SPECIFIED PRECISION: • Decimal results can be rounded to 0-9 decimal places. E.g. you may round results to the nearest 10ths, 100ths, etc. By default, the app is set up to round to 2 decimal places. If you need to round results to the nearest whole number, select 0 decimal places. • Rounding fractions to the nearest 1/2, 1/4, 1/8, 1/12, 1/16, 1/32, 1/64, 1/128, 1/256. If you do not need to round fractions, just select "-". It addition to extensive unit conversion and calculation options, UNITS MASTER offers standard features such as basic operations, calculation with parentheses, calculations with fractions and decimals, exponents, square root, trigonometric functions, etc. Other features: • Three virtual keyboards. • 'Default Output Unit' option - select default output unit or use smart Auto option • 'Output format' option: Fractions + Decimals, Auto, Fractions, Decimals. • Choose the way the app shows foot and inch symbols - you may use abbreviations ft and in or ′ for foot and ″ for inch. • Calculation history to view, recall, edit and share calculations. • Share calculation results by email. • 'Undo' for the Clear command. • Portrait and landscape mode. • Multiple themes to choose from. Learn more about UNITS MASTER at https://unitsmaster.com If you have any questions or need help with UNITS MASTER, please visit the online help and FAQ pages: https://unitsmaster.com/en/help/ https://unitsmaster.com/en/faq.html

About

Scale

This tool simplifies scaling and unit conversions for creators. It offers a vast library of scales and units, allowing for seamless adjustments and precise calculations. Customize the interface to match your workflow and focus on your projects.

Highlights
  • Extensive database of scales and units
  • Customizable scales and units
  • Imperial and metric conversions
  • Fractional and decimal rounding
  • Conversion history
  • Customizable buttons
Features
Read full description

Build models and scaled objects quicker and with more accuracy using Scale-o-Tron. Model builders, architects, board gamers, doll makers, train enthusiasts, sculptors, set designers, and anyone else that builds things to scale can focus on their craft and art rather than spending time on conversions and calculations. Scale-o-Tron features a large database of preprogrammed scales, measurement units and conversions so that you can work in the scale and system that’s best for your model. The calculator can also be easily customized to accommodate your workflow. Also, there are no ads or tracking. Features include: • 100 commonly used scales organized into categories. You can also create your own scales and store them for quick access. • Measurement units in imperial and metric, including many historical units (handy if you reference old schematics or literature). • Seamless and easy conversion between scales, units, or both. Scale up or down. • Fractional and decimal rounding. A huge time saver when building for accuracy. You control the rounding resolution. • Your last 100 conversions and calculations are stored for quick access. • Fractions are easy to input and you determine the best display format for your workflow. • Customizable buttons make the calculator work the way you want it to. • Scaling and unit conversions can be switched on and off easily. Use Scale-o-Tron like a standard calculator, if you wish. • Memory functions • Backspace key If you're building from scratch or adding scale objects to your model, Scale-o-Tron can help. It’s the calculator for makers. Reach us at support@mizmovac.com for questions or feedback.

Screenshots

UNITS MASTER4 screens
Scale4 screens

Verdict

The call

The clearest difference is rating: Scale at 5.0 against UNITS MASTER's 4.3. Scale also leads on update cadence (every 8 days vs every 4 months) and price ($2.99 vs $6.99). UNITS MASTER's advantage is review sentiment (75% vs 67%) and device support (4 vs 2). On ratings volume, 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

UNITS MASTER costs $6.99 and Scale $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Scale holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 6 and 4 respectively. Written reviews complicate that: 75% of UNITS MASTER's written reviews are positive against 67% of Scale's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

UNITS MASTER ships an update every 4 months, Scale every 8 days. The most recent releases landed on September 10, 2026 and June 1, 2026 respectively.

Scorecard5 real differences · 5 level
UNITS MASTER versus Scale: the parameters behind the verdict, then further details
ParameterUNITS MASTERScale
Price$6.99$2.99 — better
Rating4.3 (6 ratings)5.0 (4 ratings) — better
Positive reviews75.0% of reviews — better66.7% of reviews
Number of ratings6 — better4
Update frequencyEvery 4 monthsEvery 8 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPod
Requires iOS12.012.0
Further details — not scored
Size13 MB58 MB
Age rating4+4+
DeveloperIntemodino Group s.r.o.Mizmovac, Inc

Customer experience

UNITS MASTER

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

Scale

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

In-app purchases

None

UNITS MASTER

No in-app purchases

None

Scale

No in-app purchases

Questions

Is UNITS MASTER free?
UNITS MASTER costs $6.99, with no in-app purchases.
Is Scale free?
Scale costs $2.99, with no in-app purchases.
Which has better reviews, UNITS MASTER or Scale?
Scale is rated higher. UNITS MASTER averages 4.3 out of 5 from 6 ratings, while Scale averages 5.0 from 4 ratings.
Do UNITS MASTER or Scale have ads?
Neither UNITS MASTER nor Scale shows ads.
Which is updated more often, UNITS MASTER or Scale?
UNITS MASTER ships an update every 4 months, and Scale every 8 days. Most recently, UNITS MASTER was updated on September 10, 2026 and Scale on June 1, 2026.

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