# Zilmet Sizing vs Ruud

The clearest difference is review sentiment: Ruud at 50% against Zilmet Sizing's 0%. Ruud also leads on ratings volume (1.1K vs 1). Zilmet Sizing's advantage is rating (5.0 vs 4.6) and device support (3 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Zilmet Sizing holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Ruud has 1.1K ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 0% of Zilmet Sizing'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.

## The numbers

| Metric | Zilmet Sizing | Ruud |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/zilmet-sizing/id1552934924/reviews)** | [4.6 (1.1K ratings)](https://appshunter.io/ios/app/ruud/id1608918835/reviews) |
| Number of ratings | 1 | **1.1K** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Monthly |
| Monetization | Free | Free |
| Size | 2 MB | 112 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Zilmet USA LLC](https://appshunter.io/developer/1552934926) | [Rheem Manufacturing Company](https://appshunter.io/developer/853793269) |

## What reviewers say

### Zilmet Sizing

[App page](https://appshunter.io/ios/app/zilmet-sizing/id1552934924)

This program assists with sizing expansion tanks for hydronic, thermal, and water systems. It provides detailed output including required tank volume and relevant Zilmet data sheets, brochures, and installation manuals for residential and commercial applications.

**Highlights:** Expansion tank sizing, Hydronic system support, Thermal system support, Water system support, Residential and commercial applications, Tank volume calculation, Access to data sheets and manuals

**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 Zilmet Sizing free?

Zilmet Sizing 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, Zilmet Sizing or Ruud?

Zilmet Sizing is rated higher. Zilmet Sizing averages 5.0 out of 5 from 1 ratings, while Ruud averages 4.6 from 1.1K ratings.

### Do Zilmet Sizing or Ruud have ads?

Neither Zilmet Sizing nor Ruud shows ads.

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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.*