Comparison

Duct Calculator Pro vs WPG IntelliGrip

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

Head to head
About

Duct Calculator Pro

This tool assists HVAC professionals and students with quick and precise calculations for duct sizing, airflow velocity, and airflow rate. It works offline and features a user-friendly interface for efficient project work.

Highlights
  • Duct size calculation
  • Airflow velocity (FPM) calculation
  • Airflow rate (CFM) calculation
  • Rectangular and round duct support
  • Offline functionality
  • Ad-free experience
Features
Read full description

Duct Calculator is a simple, fast, and accurate tool designed for HVAC engineers, designers, technicians, and students. This app helps you calculate duct size, airflow velocity (FPM), and airflow rate (CFM) for both rectangular and round ducts with ease. Whether you are working on Heating, Ventilation, or Air Conditioning projects, this app provides quick calculations without requiring internet access. Key Features • No Internet Required – Works completely offline. • No Irritating Ads – Clean and smooth user experience. • Fast & Accurate Calculations – Built for HVAC professionals. • User-Friendly Interface – Simple layout for quick results. Available Calculators Duct Size Calculator Enter airflow rate (CFM) and airflow velocity (FPM) to get recommended rectangular and round duct sizes in inches. CFM Calculator Enter duct dimensions (length, width, or diameter in inches) and airflow velocity (FPM) to calculate airflow rate (CFM). FPM Calculator Enter duct size and airflow rate (CFM) to calculate airflow velocity (FPM). Who Should Use This App? Perfect for: • HVAC Engineers • Designers & Fabricators • Site Technicians • Students learning HVAC fundamentals

About

WPG IntelliGrip

Monitor the status, battery, vacuum levels, and performance of your DC3 Intelli-Grip lifters. Track maintenance records and access key metrics directly from your iOS device.

Highlights
  • Lifter status monitoring
  • Battery strength display
  • Vacuum level tracking
  • Performance metrics
  • Maintenance records
Features
Read full description

All DC3 Intelli-Grip lifters equipped with version 7.0 or later software is compatible with the WPG IntelliGrip app. It allows monitoring the lifter status, battery strength, vacuum levels, performance metrics, maintenance records, and much more from your iOS device.

Screenshots

Duct Calculator Pro4 screens
WPG IntelliGrip4 screens

Verdict

The call

The clearest difference is price: WPG IntelliGrip at Free against Duct Calculator Pro's $3.99. WPG IntelliGrip also leads on rating (5.0 vs 1.0) and update cadence (every 4 months vs every 72 months). Duct Calculator Pro's advantage is ads (none vs shown). On ratings volume, 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

WPG IntelliGrip is free to download; Duct Calculator Pro costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

WPG IntelliGrip holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

Duct Calculator Pro ships an update every 72 months, WPG IntelliGrip every 4 months. Both last shipped on November 3, 2026.

Scorecard6 real differences · 3 level
Duct Calculator Pro versus WPG IntelliGrip: the parameters behind the verdict, then further details
ParameterDuct Calculator ProWPG IntelliGrip
Price$3.99Free — better
Rating1.0 (1 ratings)5.0 (1 ratings) — better
Number of ratings11
Update frequencyEvery 72 monthsEvery 4 months — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationPaidAd-supported — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.515.6 — better
Further details — not scored
Size1 MB32 MB
Age rating4+4+
DeveloperImran PinjaraWOOD'S POWR-GRIP CO., INC.

In-app purchases

None

Duct Calculator Pro

No in-app purchases

None

WPG IntelliGrip

No in-app purchases

Questions

Is Duct Calculator Pro free?
Duct Calculator Pro costs $3.99, with no in-app purchases.
Is WPG IntelliGrip free?
WPG IntelliGrip is free to download, with no in-app purchases.
Which has better reviews, Duct Calculator Pro or WPG IntelliGrip?
WPG IntelliGrip is rated higher. Duct Calculator Pro averages 1.0 out of 5 from 1 ratings, while WPG IntelliGrip averages 5.0 from 1 ratings.
Do Duct Calculator Pro or WPG IntelliGrip have ads?
WPG IntelliGrip shows ads; Duct Calculator Pro does not.
Which is updated more often, Duct Calculator Pro or WPG IntelliGrip?
Duct Calculator Pro ships an update every 72 months, and WPG IntelliGrip every 4 months. Most recently, Duct Calculator Pro was updated on November 3, 2026 and WPG IntelliGrip on November 3, 2026.

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