# HVAC Duct Sizer vs Ruud

The clearest difference is price: Ruud at Free against HVAC Duct Sizer's $4.99. Ruud also leads on rating (4.6 vs 3.1) and in-app purchases (none vs 1). HVAC Duct Sizer's advantage is review sentiment (63% vs 50%). On ads, device support and iOS requirement there is nothing between them.

Ruud is free to download; HVAC Duct Sizer costs $4.99 up front. HVAC Duct Sizer sells 1 one-off in-app purchase. Ruud asks for nothing beyond the download.

Ruud holds the better App Store score, 4.6 against 3.1. That said, the two scores are not equally well evidenced: Ruud has 1.1K ratings behind it against 9, so its average is the more settled of the two. Written reviews complicate that: 63% of HVAC Duct Sizer's written reviews are positive against 50% of Ruud's, so the app with the better star average is not the one people write more warmly about.

HVAC Duct Sizer ships an update every 3 months, Ruud monthly. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | HVAC Duct Sizer | Ruud |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [3.1 (9 ratings)](https://appshunter.io/ios/app/hvac-duct-sizer/id317970395/reviews) | **[4.6 (1.1K ratings)](https://appshunter.io/ios/app/ruud/id1608918835/reviews)** |
| Number of ratings | 9 | **1.1K** |
| Positive reviews | **62.5% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 1 MB | 112 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | +4 | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Rheem Manufacturing Company](https://appshunter.io/developer/853793269) |

## What reviewers say

### HVAC Duct Sizer

[App page](https://appshunter.io/ios/app/hvac-duct-sizer/id317970395)

This app provides quick and simple HVAC duct sizing analysis. It allows users to calculate duct dimensions based on airflow or existing dimensions, and can also determine a range of duct sizes. Results can be emailed for further analysis.

**Highlights:** Duct sizing by airflow, Duct sizing by dimensions, Range of duct sizes calculation, Rectangular, round, and oval duct shapes, English and Metric unit options, Email results with CSV attachment, HVAC Equipment Locator

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


### Ruud

[App page](https://appshunter.io/ios/app/ruud/id1608918835)

This app streamlines HVAC installation, service, and support for contractors. It offers Bluetooth connectivity for system setup and troubleshooting, along with access to product information, warranty tracking, and dealer locators.

**Highlights:** Bluetooth setup and troubleshooting, System operating parameter monitoring, Alarm diagnosis and history, Access installation instructions and manuals, Track warranty information, Locate retailers and distributors, Find rebate and financing information

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Duct Sizer free?

HVAC Duct Sizer costs $4.99, and also offers in-app purchases.

### Is Ruud free?

Ruud is free to download, with no in-app purchases.

### Which has better reviews, HVAC Duct Sizer or Ruud?

Ruud is rated higher. HVAC Duct Sizer averages 3.1 out of 5 from 9 ratings, while Ruud averages 4.6 from 1.1K ratings.

### Do HVAC Duct Sizer or Ruud have ads?

Neither HVAC Duct Sizer nor Ruud shows ads.

### Which is updated more often, HVAC Duct Sizer or Ruud?

HVAC Duct Sizer ships an update every 3 months, and Ruud monthly. Most recently, HVAC Duct Sizer was updated on October 29, 2026 and Ruud on October 28, 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.*