# Sizing US/CA vs Ruud

The clearest difference is rating: Ruud at 4.6 against Sizing US/CA's 3.2. Ruud also leads on review sentiment (50% vs 11%) and ads (none vs shown). Sizing US/CA's advantage is iOS requirement (10.0 vs 16.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Ruud holds the better App Store score, 4.6 against 3.2. That said, the two scores are not equally well evidenced: Ruud has 1.1K ratings behind it against 13, so its average is the more settled of the two. Written reviews point the same way: 11% of Sizing US/CA's written reviews are positive against 50% of Ruud's.

Sizing US/CA ships an update every 6 weeks, Ruud monthly. The most recent releases landed on September 30, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Sizing US/CA | Ruud |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.2 (13 ratings)](https://appshunter.io/ios/app/sizing-usca/id1420112805/reviews) | **[4.6 (1.1K ratings)](https://appshunter.io/ios/app/ruud/id1608918835/reviews)** |
| Number of ratings | 13 | **1.1K** |
| Positive reviews | 11.1% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Monthly** |
| Monetization | Ad-supported | **Free** |
| Size | 27 MB | 112 MB |
| Requires iOS | **10.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Gastite Products LLC](https://appshunter.io/developer/668653608) | [Rheem Manufacturing Company](https://appshunter.io/developer/853793269) |

## What reviewers say

### Sizing US/CA

[App page](https://appshunter.io/ios/app/sizing-usca/id1420112805)

This utility app helps installers determine the correct size of flexible gas piping for their projects. It calculates the appropriate pipe size based on gas type, tubing length, supply pressure, and flow capacity. Users can also access installation guides and product information.

**Highlights:** Flexible gas pipe sizing, US and CA location selector, Automatic value adjustment, Certification card access, Installation guide viewer, Product search, Direct contact with developer

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Sizing US/CA free?

Sizing US/CA is free to download, with no in-app purchases.

### Is Ruud free?

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

### Which has better reviews, Sizing US/CA or Ruud?

Ruud is rated higher. Sizing US/CA averages 3.2 out of 5 from 13 ratings, while Ruud averages 4.6 from 1.1K ratings.

### Do Sizing US/CA or Ruud have ads?

Sizing US/CA shows ads; Ruud does not.

### Which is updated more often, Sizing US/CA or Ruud?

Sizing US/CA ships an update every 6 weeks, and Ruud monthly. Most recently, Sizing US/CA was updated on September 30, 2026 and Ruud on October 15, 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.*