---
title: "Quel - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "Quel is your all-in-one engineering toolkit for instrumentation and controls.  Designed for process engineers, control engineers, and instrumentation specialists, Quel brings powerful sizing and calcu"
---

# Quel — United States
> Engineering Sizing Toolkit

![Quel App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/8f/45/32/8f4532d2-ab71-7698-2d99-fb3373c6f691/Logo_Rev1-0-0-1x_U007epad-0-1-sRGB-85-220.png/434x0w.png)

**Developer:** [Unknown](https://apptail.io/developer/unknown-BbJbzb)
**Category:** Productivity
**Rating:** N/A (0 ratings)
**Price:** Free
**Bundle ID:** Quel.V1
**Store:** Apple App Store
**Country:** United States
**Version:** 1.3 (released 2026-03-23)
**Original Release:** 2025-09-24
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6752804071)
**AppTail Page:** [https://apptail.io/app/quel-Jgoy/united-states](https://apptail.io/app/quel-Jgoy/united-states)

## Quel Description
Quel is your all-in-one engineering toolkit for instrumentation and controls.

Designed for process engineers, control engineers, and instrumentation specialists, Quel brings powerful sizing and calculation tools into one streamlined app. Whether you're working on valves, orifice plates, or temperature sensors, Quel 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.

• Valve Performance Calculator – Evaluate installed gain, rangeability, and operating point across the full stroke range.

• Orifice Plate Sizing – Built-in ISO 5167 calculations for DP, Beta ratio, and flowrate in engineering units.

• Temperature Sensors – RTD and thermocouple resistance and millivolt reference tables for common sensor types.

• Unit Conversions – Instant conversions across pressure, temperature, flow, and volume to simplify day-to-day calculations.

• Save & Export – Save calculation results to history, export as PDF or text for documentation and field reports.

• 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, ASME).

• 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 work smarter and more confidently on process control projects, knowing your sizing and calculations are consistent with industry standards.

## Quel Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/79/83/3f/79833f90-8fda-afb4-3137-dcea5dd42298/IMG_1053.jpg/1242x2688.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/e0/ee/61/e0ee61f5-5cc4-b4c8-c73a-bd9ea38a99c1/IMG_1055.jpg/1242x2688.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/1f/b4/67/1fb467df-c655-08af-d4df-9397996ce019/IMG_1051.jpg/1242x2688.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/37/f0/02/37f00224-89f5-2ccd-14b9-c79dd29512ae/IMG_1050.jpg/1242x2688.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/10/f8/45/10f84546-8de1-4503-7c8a-fb6b46cce051/IMG_1054.jpg/1242x2688.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/05/9c/d6/059cd6b3-c1cf-ff75-eea2-98458e993263/IMG_1052.jpg/1242x2688.png)



## Quel In-App Purchases
| Item | Price |
|------|-------|
| Quel Monthly Plan | $9.99 |
| Quel Yearly Plan | $69.99 |



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---

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