Quel
Engineering Sizing Toolkit
Free · In‑App Purchases · Designed for iPad
Unlock full access to engineering tools and calculators. Fast, reliable, and built for pros. Unit conversion stays free for everyone.
Quel is your all-in-one engineering toolkit for instrumentation and controls.
Designed for process engineers, control engineers, and instrumentation specialists, ProcessIQ brings powerful sizing and calculation tools into one streamlined app. Whether you’re working on valves, relief devices, or flow elements, ProcessIQ helps you size, calculate, and verify with speed and accuracy.
Key Features
• Control Valve Sizing – Quickly determine Cv, flow conditions, and check for subcritical or critical operation.
• Relief Valve Sizing – Apply industry-standard formulas to calculate required relieving capacity for cryogenic and warm services.
• Orifice Plate Sizing – Built-in ISO 5167 calculations for DP, Beta ratio, and flowrate in engineering units.
• Unit Conversions – Instant conversions across pressure, temperature, flow, and volume to simplify day-to-day calculations.
• Engineering References – Quick guides and formulas used in the field for sizing and troubleshooting.
Why Quel?
• Fast & Reliable – Save time in the field or office with ready-to-use sizing tools.
• Accurate – Built around standard engineering methods (ISA, IEC, API, ISO).
• Practical – Designed by engineers, for engineers, with workflows that match real projects.
• Portable – A professional-grade toolkit in your pocket, whether you’re commissioning, troubleshooting, or reviewing designs.
With Quel, you can work smarter and more confidently on process control projects, knowing your sizing and calculations are consistent with industry standards.
Ratings & Reviews
This app hasn’t received enough ratings or reviews to display an overview.
• Performance improvements for faster calculations
• Bug fixes and stability updates
• Improved accuracy in valve and flow sizing formulas
• Enhanced unit conversion tool
The developer, Guillermo Alvarado, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Guillermo Alvarado
- Size
- 4.3 MB
- Category
- Productivity
- Compatibility
Requires iOS 15.6 or later.
- iPhone
Requires iOS 15.6 or later. - iPad
Requires iPadOS 15.6 or later. - iPod touch
Requires iOS 15.6 or later. - Mac
Requires macOS 12.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Quel Monthly Plan $9.99
- Quel Yearly Plan $69.99
- Copyright
- © 2025 Guillermo Alvarado. All rights reserved.