# CORE Service vs Ruud

The clearest difference is review sentiment: Ruud at 50% against CORE Service's 0%. Ruud also leads on rating (4.6 vs 3.6) and ratings volume (1.1K vs 19). CORE Service's advantage is 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.

Ruud holds the better App Store score, 4.6 against 3.6. That said, the two scores are not equally well evidenced: Ruud has 1.1K ratings behind it against 19, so its average is the more settled of the two. Written reviews point the same way: 0% of CORE Service's written reviews are positive against 50% of Ruud's.

CORE Service ships an update every 3 months, Ruud monthly. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | CORE Service | Ruud |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (19 ratings)](https://appshunter.io/ios/app/core-service/id1566612696/reviews) | **[4.6 (1.1K ratings)](https://appshunter.io/ios/app/ruud/id1608918835/reviews)** |
| Number of ratings | 19 | **1.1K** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free | Free |
| Size | 47 MB | 112 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Lennox Industries](https://appshunter.io/developer/355049651) | [Rheem Manufacturing Company](https://appshunter.io/developer/853793269) |

## What reviewers say

### CORE Service

[App page](https://appshunter.io/ios/app/core-service/id1566612696)

This app provides a wireless interface for commercial HVAC technicians to control and service specific Lennox rooftop units. It offers guided setup, enhanced testing, and parameter configuration to streamline the service process.

**Highlights:** Wireless mobile service app, Guided setup with progress indicators, Enhanced test functionality, Real-time sensor readings and trending, Parameter configuration, Exportable setup summaries

**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 CORE Service free?

CORE Service 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, CORE Service or Ruud?

Ruud is rated higher. CORE Service averages 3.6 out of 5 from 19 ratings, while Ruud averages 4.6 from 1.1K ratings.

### Do CORE Service or Ruud have ads?

Neither CORE Service nor Ruud shows ads.

### Which is updated more often, CORE Service or Ruud?

CORE Service ships an update every 3 months, and Ruud monthly. Most recently, CORE Service was updated on October 24, 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.*