# Ruud vs CoolCalc

The clearest difference is in-app purchases: Ruud at none against CoolCalc's 3. Ruud also leads on ratings volume (1.1K vs 1). CoolCalc's advantage is rating (5.0 vs 4.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. CoolCalc sells 3 in-app purchases, starting at $9.99 per month. Ruud asks for nothing beyond the download.

CoolCalc 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.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 22, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Ruud | CoolCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (1.1K ratings)](https://appshunter.io/ios/app/ruud/id1608918835/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/coolcalc-hvac-tools/id6773545951/reviews)** |
| Number of ratings | **1.1K** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 112 MB | 29 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Rheem Manufacturing Company](https://appshunter.io/developer/853793269) | [杰 陈](https://appshunter.io/developer/1746018277) |

## What reviewers say

### 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


### CoolCalc

[App page](https://appshunter.io/ios/app/coolcalc-hvac-tools/id6773545951)

This offline toolkit for service technicians provides essential HVAC calculations, job documentation, and professional PDF reporting. It supports A2L refrigerants and prioritizes user privacy with no account or cloud storage required.

**Highlights:** Offline HVAC calculations, PT Chart and Charge Check, Duct Sizing and Airflow Calcs, Capacitor and Refrigerant Log, Professional PDF report generation, A2L refrigerant support, Privacy-focused, no account needed

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CoolCalc Pro Monthly | $9.99 | per month |
| CoolCalc Pro Yearly | $59.99 | per year |
| CoolCalc Pro Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is Ruud free?

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

### Is CoolCalc free?

CoolCalc is free to download, with in-app purchases available.

### Which has better reviews, Ruud or CoolCalc?

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

### Do Ruud or CoolCalc have ads?

Neither Ruud nor CoolCalc shows ads.

### Which is updated more often, Ruud or CoolCalc?

Ruud ships an update monthly, and CoolCalc monthly. Most recently, Ruud was updated on October 22, 2026 and CoolCalc 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.*