Comparison

Scala Architectural Scale vs Ruler

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

Ruler

This utility app uses augmented reality to measure the length and area of real-world objects using your smartphone's camera. It offers unlimited measurements and an ad-free experience with premium subscriptions.

Highlights
  • Augmented reality measurement
  • Measure length and area
  • High precision with AR Kit
  • Unlimited measurements (premium)
  • Ad-free experience (premium)
  • Subscription options available
Read full description

Ruler is the easiest and most accurate based on augmented reality. The app uses augmented reality technology(AR) to measure the real world object's area and length with your smartphone's camera. We have constantly improved​ this app since AR Kit was released which ensure the highest precision. Premium Services 1. Unlimited length Measurement. 2. Unlimited Area Measurement. 3. No Annoying ads. * Subscription is available like any ruler app. The payments will be charged to your iTunes account at confirmation of your purchase. * Subscription automatically renews for the same price and duration period as the original “one week”/”one month”/ unless auto-renew is turned off at least 24-hours before the end of the current period Our Standard Subscriptions are: 1. A one-week auto-renewal subscription with a 3-day trial period. 2. A one-month auto-renewal subscription with a 3-day trial period. Privacy Policy: https://sites.google.com/view/rulerios/terms-condition/privacy-policy Terms of Use: https://sites.google.com/view/rulerios/terms-condition

Screenshots

Scala Architectural Scale4 screens
Ruler4 screens

Verdict

The call

The clearest difference is review sentiment: Scala Architectural Scale at 87% against Ruler's 33%. Scala Architectural Scale also leads on ads (none vs shown) and monetization model (free vs free with in-app purchases). Ruler's advantage is ratings volume (136 vs 24) and iOS requirement (11.0 vs 15.6). On price, update cadence, in-app purchases 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 and Ruler sells 2 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Scala Architectural Scale holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: Ruler has 136 ratings behind it against 24, so its average is the more settled of the two. Written reviews point the same way: 87% of Scala Architectural Scale's written reviews are positive against 33% of Ruler's.

UpkeepUpdate frequency

Scala Architectural Scale ships an update every 4 months, Ruler every 7 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

Scorecard6 real differences · 4 level
Scala Architectural Scale versus Ruler: the parameters behind the verdict, then further details
ParameterScala Architectural ScaleRuler
PriceFreeFree
Rating4.6 (24 ratings) — better4.3 (136 ratings)
Positive reviews86.7% of reviews — better33.3% of reviews
Number of ratings24136 — better
Update frequencyEvery 4 months — betterEvery 7 months
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.611.0 — better
Further details — not scored
Size1 MB32 MB
Age rating4+4+
DeveloperNoerah AlviMD KHAIRUL ISLAM

Customer experience

Scala Architectural Scale

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

Ruler

All ratings133 ratings
Positive82.0%
Neutral6.8%
Negative11.3%
Written reviews3 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

In-app purchases

1 purchases

Scala Architectural Scale

One-time1
  • Scala Full Version$2.99
2 purchases

Ruler

Subscriptions2
  • Ruler Premium Weekly3 Days trial$1.997 Days
  • Ruler Monthly Premium3 Days trial$5.991 Month

Questions

Is Scala Architectural Scale free?
Scala Architectural Scale is free to download, with in-app purchases available.
Is Ruler free?
Ruler is free to download, with in-app purchases available.
Which has better reviews, Scala Architectural Scale or Ruler?
Scala Architectural Scale is rated higher. Scala Architectural Scale averages 4.6 out of 5 from 24 ratings, while Ruler averages 4.3 from 136 ratings.
Do Scala Architectural Scale or Ruler have ads?
Ruler shows ads; Scala Architectural Scale does not.
Which is updated more often, Scala Architectural Scale or Ruler?
Scala Architectural Scale ships an update every 4 months, and Ruler every 7 months. Most recently, Scala Architectural Scale was updated on October 26, 2026 and Ruler on October 24, 2026.

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