# Duct Calculator Pro vs WPG IntelliGrip

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.

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.

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.

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

## The numbers

| Metric | Duct Calculator Pro | WPG IntelliGrip |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/duct-calculator-pro/id1492222891/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/wpg-intelligrip/id1505795506/reviews)** |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 72 months | **Every 4 months** |
| Monetization | Paid | **Ad-supported** |
| Size | 1 MB | 32 MB |
| Requires iOS | 18.5 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Imran Pinjara](https://appshunter.io/developer/1484488781) | [WOOD'S POWR-GRIP CO., INC.](https://appshunter.io/developer/1505795505) |

## What reviewers say

### Duct Calculator Pro

[App page](https://appshunter.io/ios/app/duct-calculator-pro/id1492222891)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### WPG IntelliGrip

[App page](https://appshunter.io/ios/app/wpg-intelligrip/id1505795506)

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:** macOS Compatibility

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*