Comparison

Construction Calc Pro 2 vs Drain Slope Pro

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

Head to head
About

Construction Calc Pro 2

This powerful calculator app is designed specifically for construction professionals, enabling calculations in feet, inches, and fractional inches. It offers specialized modules for material estimates, conversions, area and volume calculations, trigonometry, and stair design, transforming your device into a comprehensive construction computer.

Highlights
  • Calculations in feet, inches, and fractional inches
  • Material estimation modules
  • Conversions for various measurements
  • Area and volume calculations
  • Trigonometry and triangle solver
  • Stairwell and stair calculator
  • Crown moulding module
Features
Currently charting
Read full description

C-Calc Pro 2 is a calculator app designed by, and for construction workers. Unlike a standard construction calculator, C-Calc uses the power of the IPhone to create a construction computer. This full function calculator works as a standard calculator but more importantly allows you to work in feet, inches, and fractional inches. The calculator also features several other modules for performing material estimates, crown moulding, conversions, area calculations and volume calculations, arcs and arches, trig and triangles, and stairwells and stairs. Contractors, architects, tradespersons, builders and even do-it-yourselfers will find this app ideal. Features include: - Universal app runs on iPhone, iPad, and Mac. - Add, subtract, multiply, divide, exponent, root and more with measurements in feet, inches, and fractional inches. - Reduce fractions and fractional inches to their lowest common denominator. - Convert decimal values to fractions and vice versa. - Unlimited memory slots to store, recall, add and subtract memory values. Memory values are shared between all modules as well. - Split screen shows result, memory, and measurement values all at once. - Calculate square footage and cubic footage easily. - Conversions for temperatures, distances, angles, areas, and many more built in. - Help screen and full instructions included in program. - Estimate drywall, concrete, block, paint, tile, lumber, and associated materials. - Transfer individual estimates to a running estimate sheet where you can keep track of your total as well as email the estimate to a man in the field, to yourself, or to the supplier. - Calculate surface areas and volumes of a large variety of shapes (including compound objects) for material estimates. - Crown moulding module built in which supports any spring angle and any wall angle. Actually, see the saw settings on your phone. - Trigonometry calculator included for solving triangles, rise/run, rafters, slope, and more. Triangles are graphically mapped on your phone's screen to give a visual. - Advanced arc/circle calculator for solving arcs, radius, circumference, sector areas, sector angles, and circle areas. - Stair calculator for solving rise, run, unit rise, unit run, # of risers, # of treads, incline, stairwell opening, and stringer length. Drawings are to scale and may be easily printed or saved. Forget a bulky $200 calculator and simply buy the app. The app will always be on your hip when you need it most instead of in the truck's glove compartment. C-Calc Pro 2 has much more to offer in the coming months with free upgrades as well. We take our fellow tradesmen's opinions very seriously and the app will grow to reflect the people's opinion.

About

Drain Slope Pro

Features
Read full description

The fastest drain slope calculator built for licensed plumbers. FIND MINIMUM DROP REQUIRED Enter pipe diameter and run length — Drain Slope Pro instantly tells you the minimum drop to meet IPC 2021. Know the number before you rough in. VERIFY ANY SLOPE Enter your pipe specs and slope, hit Calculate, and get immediate pass/fail compliance with total fall, IPC status, and margin. IPC 2021 COMPLIANCE Every result references IPC 2021, Table 704.1. OUTLET ELEVATION CALCULATOR Enter inlet elevation above finished floor — get exact outlet elevation. Eliminates field math during rough-in. FRACTION DISPLAY All slopes display as fractions: ⅛"/ft · ¼"/ft · ⅜"/ft · ½"/ft. WORKS OFFLINE All IPC tables embedded. No internet. No account. ONE-TIME PURCHASE — $1.99 Unlock unlimited calculations. No subscription. A FieldMetric tool. IPC 2021 · Table 704.1 ≤3" pipe = ¼"/ft min · ≥4" pipe = ⅛"/ft min

Screenshots

Construction Calc Pro 24 screens
Drain Slope Pro4 screens

Verdict

The call

The clearest difference is price: Drain Slope Pro at Free against Construction Calc Pro 2's $13.99. Drain Slope Pro also leads on iOS requirement (15.1 vs 26.0). Construction Calc Pro 2's advantage is in-app purchases (none vs 1) and chart position (#197 vs unranked). On update cadence, ads 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

Drain Slope Pro is free to download; Construction Calc Pro 2 costs $13.99 up front. Drain Slope Pro sells 1 one-off in-app purchase. Construction Calc Pro 2 asks for nothing beyond the download.

UpkeepUpdate frequency

Construction Calc Pro 2 ships an update every 4 months, Drain Slope Pro every 3 months. The most recent releases landed on October 25, 2026 and October 6, 2026 respectively.

Scorecard4 real differences · 7 level
Construction Calc Pro 2 versus Drain Slope Pro: the parameters behind the verdict, then further details
ParameterConstruction Calc Pro 2Drain Slope Pro
Price$13.99Free — better
Rating4.7 (9 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings9 — better—
Update frequencyEvery 4 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid—
Best chart rank#197 — better—
DevicesiPhone, iPadiPhone, iPod
Requires iOS26.015.1 — better
Further details — not scored
Size85 MB39 MB
Age rating4+4+
DeveloperSnappy Appz Inc.BRUCE RAY MCCAMPBELL

In-app purchases

None

Construction Calc Pro 2

No in-app purchases

1 purchases

Drain Slope Pro

One-time1
  • Pro Unlock$1.99

Questions

Is Construction Calc Pro 2 free?
Construction Calc Pro 2 costs $13.99, with no in-app purchases.
Is Drain Slope Pro free?
Drain Slope Pro is free to download, with in-app purchases available.
Do Construction Calc Pro 2 or Drain Slope Pro have ads?
Neither Construction Calc Pro 2 nor Drain Slope Pro shows ads.
Which is updated more often, Construction Calc Pro 2 or Drain Slope Pro?
Construction Calc Pro 2 ships an update every 4 months, and Drain Slope Pro every 3 months. Most recently, Construction Calc Pro 2 was updated on October 25, 2026 and Drain Slope Pro on October 6, 2026.

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