Comparison

Ruler vs Construction Calc Pro 7

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
Read full description

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

Construction Calc Pro 7

This app offers a comprehensive suite of 82 construction calculators for various tasks like concrete, drywall, and roofing. It allows measurements in both imperial and metric units and features a high-visibility display for use in direct sunlight.

Highlights
  • 82 construction calculators
  • Imperial and metric measurements
  • High visibility display
  • Aggregate, asphalt, concrete calculations
  • Drywall, flooring, framing tools
  • Paint, rafter, roofing calculators
Features
Read full description

83 Powerful, Proven & Precise Tools. Enter measurements in feet/inches or metric. There is no complicated manual to master or instructions to follow, just enter data and get precise results. HIGH VISIBILITY IN DIRECT SUNLIGHT White on black text, with blue and orange inputs and outputs for high visibility in direct sunlight. CALCULATORS INCLUDE: AGGREGATE Inputs: Width, Length, Thickness, Density, Wastage Outputs: Weight, Volume ASPHALT Inputs: Width, Length, Thickness Outputs: Weight, Volume BALUSTERS Inputs: Run length, Baluster width, Baluster spacing Outputs: Qty of balusters, Qty spaces, Baluster spacing (center-to-center), Baluster spacing (edge-to-edge), Measurements to far side of each baluster BOARD / LINEAL FOOT Inputs: Thickness, Width, Length, Quantity Outputs: Board feet, Lineal feet CONCRETE Inputs: Width, Length, Thickness, Use rebar option, Rebar spacing along width, Rebar spacing along length Outputs: Volume, 60lb premixed bags, 80lb premixed bags, 10kg premixed bags, 25kg premixed bags, 50kg premixed bags, Rebar required CROWN MOULDING Inputs: Wall angle (corner of wall), Crown (spring) angle Outputs: Miter angle, Bevel angle DROP CEILING Inputs: Length at ceiling, Width at ceiling, Tile size, Distance (anchor to drop ceiling) Outputs: Ceiling area, Ceiling tiles, Perimeter moulding, Main supports, Tee support peices, Wire length (each), Wire length (total), Wire anchors DRYWALL Inputs: Room width, Room length, Room height, Panel width, Panel height, Include ceiling option Outputs: Area - surface area. Materials - Drywall panels. Joint compounds - Readymixed, Lightweight readymixed, Setting-type, Lightweight setting-type. Fastener - Drywall nails, Drywall screws. Additional items: Joint tape, Primer, Adhesive FLOORING Inputs: Width, Length, Wastage, Square Ft or M per box Outputs: Total area, Boxes needed FRAMING Inputs: Total wall length, Qty of windows, Qty of doors, Qty of corners, Stud spacing (on center) Outputs: Studs required LINEAR COST ESTIMATOR Inputs: Single panel length, Qty of panels, Cost per linear foot, Cost per linear meter Outputs: Total cost, Total length PAINT Inputs: Wall length, Wall height, Number of coats, Surface type Outputs: Gallons required, Liters required RAFTER Inputs: Run, Pitch (/12") Outputs: Rafter length RISE/RUN/ANGLE Inputs: Rise, Run, Angle (Enter rise and either run or angle) Outputs: Angle, slope, Run ROOFING Inputs: Width, Length, Pitch, Sq ft or M per pack, Type, Nails, Safety margin Outputs: Roof surface area, Packs needed, Nails SQ COST ESTIMATOR Inputs: Width, Length, Cost per Sq ft or M Outputs: Total cost, Total area, Total area (acres)

Screenshots

Ruler4 screens
Construction Calc Pro 74 screens

Verdict

The call

The clearest difference is rating: Construction Calc Pro 7 at 4.3 against Ruler's 3.7. Construction Calc Pro 7 also leads on update cadence (every 2 months vs every 5 months) and ratings volume (28 vs 3). Ruler's advantage is review sentiment (63% vs 25%). On price, 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

Both are free to download. Ruler sells 1 one-off in-app purchase and Construction Calc Pro 7 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Construction Calc Pro 7 holds the better App Store score, 4.3 against 3.7. That said, the two scores are not equally well evidenced: Construction Calc Pro 7 has 28 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 63% of Ruler's written reviews are positive against 25% of Construction Calc Pro 7's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Ruler ships an update every 5 months, Construction Calc Pro 7 every 2 months. The most recent releases landed on October 21, 2026 and October 8, 2026 respectively.

Scorecard4 real differences · 6 level
Ruler versus Construction Calc Pro 7: the parameters behind the verdict, then further details
ParameterRulerConstruction Calc Pro 7
PriceFreeFree
Rating3.7 (3 ratings)4.3 (28 ratings) — better
Positive reviews63.0% of reviews — better25.0% of reviews
Number of ratings328 — better
Update frequencyEvery 5 monthsEvery 2 months — better
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size4 MB88 MB
Age rating4+4+
Developermitsunori oishiTroy Knight

Customer experience

Ruler

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews27 reviews
Positive63.0%
Neutral3.7%
Negative33.3%

Construction Calc Pro 7

All ratings28 ratings
Positive78.6%
Neutral7.1%
Negative14.3%
Written reviews8 reviews
Positive25.0%
Neutral37.5%
Negative37.5%

In-app purchases

1 purchases

Ruler

One-time1
  • Hide Ads$0.99
1 purchases

Construction Calc Pro 7

One-time1
  • Premium ad-free version$3.99

Questions

Is Ruler free?
Ruler is free to download, with in-app purchases available.
Is Construction Calc Pro 7 free?
Construction Calc Pro 7 is free to download, with in-app purchases available.
Which has better reviews, Ruler or Construction Calc Pro 7?
Construction Calc Pro 7 is rated higher. Ruler averages 3.7 out of 5 from 3 ratings, while Construction Calc Pro 7 averages 4.3 from 28 ratings.
Do Ruler or Construction Calc Pro 7 have ads?
Both Ruler and Construction Calc Pro 7 show ads.
Which is updated more often, Ruler or Construction Calc Pro 7?
Ruler ships an update every 5 months, and Construction Calc Pro 7 every 2 months. Most recently, Ruler was updated on October 21, 2026 and Construction Calc Pro 7 on October 8, 2026.

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