# Steam Worx vs Quel

The clearest difference is in-app purchases: Steam Worx at none against Quel's 3. Quel's advantage is update cadence (every 5 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Steam Worx ships an update every 2 months, Quel every 5 days. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Steam Worx | Quel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/steam-worx/id6467222774/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Free | — |
| Size | 18 MB | 7 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Watson McDaniel Company](https://appshunter.io/developer/1708408873) | [Guillermo Alvarado](https://appshunter.io/developer/1841024589) |

## What reviewers say

### Steam Worx

[App page](https://appshunter.io/ios/app/steam-worx/id6467222774)

This application assists engineers and technicians with complex fluid dynamics calculations. It provides tools for sizing and selecting pressure relief valves, control valves for steam and water, and heat exchangers. The app also includes calculators for pipe sizing, noise levels, and unit conversions.

**Highlights:** Pilot-Operated PRV Sizing, Control Valve Sizing (Steam & Water), Heat Exchanger Sizing, Pipe Sizing & Velocities, Noise Level & Cavitation Calculations, Unit Conversions

**Features:** macOS Compatibility

**In-app purchases:** none


### Quel

[App page](https://appshunter.io/ios/app/quel/id6752804071)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Quel Monthly Plan | $9.99 | per month |
| Quel Yearly Plan | $69.99 | per year |
| Full Access | $4.99 | one-time |


## Frequently asked questions

### Is Steam Worx free?

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

### Is Quel free?

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

### Do Steam Worx or Quel have ads?

Neither Steam Worx nor Quel shows ads.

### Which is updated more often, Steam Worx or Quel?

Steam Worx ships an update every 2 months, and Quel every 5 days. Most recently, Steam Worx was updated on October 30, 2026 and Quel 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.*