Comparison

Scala Architectural Scale vs ArchMM

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

Head to head
About

Scala Architectural Scale

This app allows users to measure printed architectural and engineering drawings directly on their device. It supports both known and unknown scales, offering fixed and variable scale options for precise measurements. Users can also select secondary units for quick conversions.

Highlights
  • Fixed and variable scale measurement
  • Supports unknown drawing scales
  • Secondary unit conversions (metric, decimal feet, feet/inches)
  • Adjustable measurement precision
  • Extensive scale options for architectural, engineering, and metric drawings
Features
Read full description

Let Scala Architectural and Engineering Scale change the way you measure printed drawings on the go and at your desk. With fixed and variable scales there is no limit to measuring a printed drawing of any scale, even if the scale is unknown. FIXED SCALES If you know the scale of a drawing, place your device on the drawing, scroll to the scale of the printed drawing and watch the chosen scale slide in. VARIABLE SCALES If the scale of a drawing is unknown, slide your finger on the variable scale and match the scale of one known element, lock it and use it to measure all elements on that drawing. MEASURING Slide the measurement slider in fixed or variable scale modes, along the scale to see the desired measurement displayed. SECONDARY UNITS Choose secondary units to be displayed while measuring, to quickly convert between metric, decimal feet and feet and inches. PRECISION Control the precision of the measurement units. —-— Scala Free Version includes: ARCHITECTURAL Fixed Scales: Full Scale (12”=1’-0”), 6”=1’-0”, 3”=1’-0”, 1 1/2”=1’-0”, 1”=1’-0”, 3/4”=1’-0” Variable Scale Range: Between full scale and 1/32”=1’-0” ENGINEERING Fixed Scales: 1”=10’, 1”=20’, 1”=30’, 1”=40’, 1”=50’ and 1”=60’ Variable Scale Range: Between 1”=10’ and 1”=300’ METRIC Fixed Scales: 1:1, 1:2, 1:5, 1:10, 1:20, 1:25 Variable Scale Range: Between 1:1 and 1:1000 Scala Full Version includes all scales above plus the following: ARCHITECTURAL Fixed Scales: 1/2”=1’-0”, 3/8”=1’-0”, 1/4”=1’-0”, 3/16”=1’-0”, 1/8”=1’-0”, 3/32”=1’-0”, 1/16”=1’-0”, 1/32"=1'-0" ENGINEERING Fixed Scales: 1"=80', 1"=100', 1"=200', 1"=300' METRIC Fixed Scales: 1:30, 1:40, 1:50, 1:75, 1:100, 1:125, 1:200, 1:250, 1:300, 1:400, 1:500, 1:1000 —-—

About

ArchMM

This app provides specialized calculation tools for architectural scales, model making, and carpentry. It handles measurements in feet, inches, and fractions, converting them for various design and building projects. Features include board feet calculation, stair layout assistance, and rafter geometry.

Highlights
  • Architectural scale conversions
  • Model scale to millimeters
  • Carpenter calculator with dedicated buttons
  • Board feet calculation
  • Stair layout and rafter geometry tools
  • Copy results and multiple appearance themes
Features
Read full description

Scale, measure, and calculate with ArchMM. A practical calculator for designers, model makers, builders, architects, and students—built around feet, inches, fractions, and architectural scale. MODEL SCALE Convert full-size feet and inches to model millimeters for 3D printing and model making, or work backward from a model measurement. Choose 1:1 or common architectural scales and compare the converted length with a printer-bed preset. CARPENTER CALCULATOR Use dedicated number, unit, fraction, and arithmetic buttons. Add and subtract dimensions, multiply lengths into area or volume, recall memory, and revisit recent calculations. The next number after equals starts a new calculation. SCALE TO INCHES Enter a full-size measurement and get its scaled size in inches. Change the drawing scale at any time. PROJECT TOOLS Calculate board feet, explore a stair layout, and work out common-rafter geometry. Each tool explains its assumptions. These are geometry estimates, not structural design or code-compliance approval. MADE FOR EVERYDAY WORK • Copy results for your next task • Light, Dark, and System appearance • On-device calculations with no account, ads, analytics, or tracking • No internet connection needed for calculations Printer checks compare one converted length with the bed dimensions. Confirm the complete part geometry, orientation, and clearances in your slicer.

Screenshots

Scala Architectural Scale4 screens
ArchMM4 screens

Verdict

The call

The clearest difference is in-app purchases: ArchMM at none against Scala Architectural Scale's 1. ArchMM also leads on rating (5.0 vs 4.6) and update cadence (monthly vs every 4 months). Scala Architectural Scale's advantage is ratings volume (24 vs 1) and iOS requirement (15.6 vs 18.0). On price, ads, monetization model and device support 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

Both are free to download. Scala Architectural Scale sells 1 one-off in-app purchase. ArchMM asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

ArchMM holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Scala Architectural Scale has 24 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Scala Architectural Scale ships an update every 4 months, ArchMM monthly. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

Scorecard5 real differences · 5 level
Scala Architectural Scale versus ArchMM: the parameters behind the verdict, then further details
ParameterScala Architectural ScaleArchMM
PriceFreeFree
Rating4.6 (24 ratings)5.0 (1 ratings) — better
Positive reviews86.7% of reviews—
Number of ratings24 — better1
Update frequencyEvery 4 monthsMonthly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, Mac
Requires iOS15.6 — better18.0
Further details — not scored
Size1 MB6 MB
Age rating4+4+
DeveloperNoerah AlviBrandon Davis

Customer experience

Scala Architectural Scale

All ratings25 ratings
Positive88.0%
Neutral8.0%
Negative4.0%
Written reviews15 reviews
Positive86.7%
Neutral0.0%
Negative13.3%

ArchMM

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Scala Architectural Scale

One-time1
  • Scala Full Version$2.99
None

ArchMM

No in-app purchases

Questions

Is Scala Architectural Scale free?
Scala Architectural Scale is free to download, with in-app purchases available.
Is ArchMM free?
ArchMM is free to download, with no in-app purchases.
Which has better reviews, Scala Architectural Scale or ArchMM?
ArchMM is rated higher. Scala Architectural Scale averages 4.6 out of 5 from 24 ratings, while ArchMM averages 5.0 from 1 ratings.
Do Scala Architectural Scale or ArchMM have ads?
Neither Scala Architectural Scale nor ArchMM shows ads.
Which is updated more often, Scala Architectural Scale or ArchMM?
Scala Architectural Scale ships an update every 4 months, and ArchMM monthly. Most recently, Scala Architectural Scale was updated on October 26, 2026 and ArchMM on October 25, 2026.

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