Comparison

Ruler vs ScaleAloha

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

Head to head
About

Ruler

This app displays various measurement scales for length, including meters and inches. It allows users to set magnification ratios and reduced scales for different applications. Users can calibrate the ruler and adjust PPI settings for accurate measurements.

Highlights
  • Display various measurement scales
  • Set magnification ratios
  • Set reduced scales
  • Measure in meters and inches
  • Free mode for custom scales
  • Calibration for accuracy
  • PPI setting
Features
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Scale Ruler is the simple application to display the scale of various measurement units. ※ Warning: - The accuracy of the scales cannot be guaranteed. - Calibration and PPI values ​​will be reset when the model changes. - Set the PPI value only when the model is undecided. - When you change the PPI value, perform calibration after the change. ■How to use: ■Select mode In UNLOCKED state, after choosing measurement unit, magnification ratio and reduced scale, the scale is displayed. ■Free mode When dragging the screen at UNLOCK, you can set the scale in the range 1: 1 to 1: 100. When you press and hold the scale value, the keyboard is displayed and you can enter the scale. You can lock the scale on the ruler with a switch. Sorry for the advertisement during unlocking. After In-App Purchase, your ads will no longer be displayed. Specification of Scale Ruler - measure length meter,inches - magnification ratio 50% , 70.7% , 100% , 141% , 200% - reduced scale  for meter    1:100 , 1:150 , 1:200 , 1:250 , 1:300 , 1:400 , 1:500 , 1:600  for inch   1:1 , 1:1.5 , 1:2 , 1:2.5 , 1:3 , 1:4 , 1:5 , 1:6  for inch(Architectural)   1:1 , 1:2 , 1:4 , 1:8 , 1:12 , 1:16 , 1:24 , 1:32 , 1:48 , 1:64   1:96 , 1:128 , 1:192 , 1:384  for inch(Engineering) 1:120 , 1:240 , 1:360 , 1:480 , 1:600 , 1:720 1:800 , 1:960 , 1:1080 ■ Settings - Calibration - PPI (pixels per inch) setting - In-app purchase (ads not displayed) - In-app purchase restoration ■ Calibration Adjust the length of the ruler. Use the correct ruler for adjustment. "Calibration" button: Records the adjusted state and reflects the calibration result on the ruler. "Reset" button: Returns the adjustment status to the specified value. It will not be recorded. "Initialize" button: Returns the adjustment status to the specified value and reflects it on the ruler. * Caution: The calibration value will be reset when the model changes. ■ PPI (pixels per inch) setting If the model is undecided, check the PPI value of the model before setting the PPI value. * Please set only when the model is undecided. "OK" button: Record the entered PPI value and reflect it on the ruler display. "Initialize" button: Returns the PPI value to the specified value and reflects it on the ruler. * Caution: The PPI value will be reset when the model changes.

About

ScaleAloha

Features
Read full description

Architecture students, we see you squinting at tiny drawings, muttering "1:50 or 1:100?" like it's a secret code. Fear not! Scale Aloha is here to rescue your sanity (and your GPA). Whether you're wrestling with blueprints at 2 a.m. or trying to impress your studio crush with flawless scale conversions, Scale Aloha is your trusty sidekick. Just plug in your numbers, tap a button, and voilà - accurate scale calculations faster than you can say "Le Corbusier."

Screenshots

Ruler4 screens
ScaleAloha3 screens

Verdict

The call

The clearest difference is in-app purchases: ScaleAloha at none against Ruler's 1. ScaleAloha also leads on ads (none vs shown) and update cadence (every 6 weeks vs every 5 months). Ruler's advantage is iOS requirement (15.0 vs 17.6). On price 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. Ruler sells 1 one-off in-app purchase. ScaleAloha asks for nothing beyond the download.

UpkeepUpdate frequency

Ruler ships an update every 5 months, ScaleAloha every 6 weeks. The most recent releases landed on June 1, 2026 and September 13, 2026 respectively.

Scorecard4 real differences · 6 level
Ruler versus ScaleAloha: the parameters behind the verdict, then further details
ParameterRulerScaleAloha
PriceFreeFree
Rating3.7 (3 ratings) — better—
Positive reviews63.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 5 monthsEvery 6 weeks — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.6
Further details — not scored
Size4 MB27 MB
Age rating4+4+
Developermitsunori oishiIgor Forgac

In-app purchases

1 purchases

Ruler

One-time1
  • Hide Ads$0.99
None

ScaleAloha

No in-app purchases

Questions

Is Ruler free?
Ruler is free to download, with in-app purchases available.
Is ScaleAloha free?
ScaleAloha is free to download, with no in-app purchases.
Do Ruler or ScaleAloha have ads?
Ruler shows ads; ScaleAloha does not.
Which is updated more often, Ruler or ScaleAloha?
Ruler ships an update every 5 months, and ScaleAloha every 6 weeks. Most recently, Ruler was updated on June 1, 2026 and ScaleAloha on September 13, 2026.

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