I&C Pro vs Quel
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
I&C Pro
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The only field toolkit built by a commissioning engineer — not just unit conversion. Reproduce density-compensated level to match your DCS (T3000 / Ovation), diagnose O₂ zirconia analyzer cells, and convert gas units with O₂ and wet/dry correction. Verified against O&M manuals and live DCS values. ■Level Compensator Reproduces density-compensated level measurement precisely. It keeps hook-up, CALIB, and DCS scaling separate per vessel type—HP/LP feedwater heaters, flash tanks, and steam drums—and lets you compare the Siemens T3000 and Emerson Ovation LEVELCOMP algorithms side by side on the same configuration. Save a profile per instrument and reload it on your next visit with no re-typing. ■Field calculators Coal silo level, proximity-probe calibration, tank level, level-transmitter verification, and gas unit conversion—the calculations you repeat on every commissioning job, done fast. ■Built for the field Follows real data-sheet terminology and sign conventions, and works fully offline. Configure each vessel once; each day you only enter the live reading. For power-plant commissioning, maintenance, and I&C/DCS engineers.
Quel
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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.
Screenshots
Verdict
The clearest difference is price: Quel at Free against I&C Pro's $7.99. Quel also leads on update cadence (every 5 days vs every 3 weeks) and iOS requirement (15.6 vs 18.4). I&C Pro's advantage is in-app purchases (none vs 3). On ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Quel is free to download; I&C Pro costs $7.99 up front. Quel sells 3 in-app purchases, starting at $9.99 per month. I&C Pro asks for nothing beyond the download.
I&C Pro ships an update every 3 weeks, Quel every 5 days. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.
| Parameter | I&C Pro | Quel |
|---|---|---|
| Price | $7.99 | Free — better |
| Update frequency | Every 3 weeks | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.4 | 15.6 — better |
| Further details — not scored | ||
| Size | 13 MB | 7 MB |
| Age rating | 17+ | 4+ |
| Developer | I&C Pro | Guillermo Alvarado |
In-app purchases
I&C Pro
No in-app purchases
Quel
- Quel Monthly Plan$9.991 Month
- Quel Yearly Plan$69.991 Year
- Full Access$4.99









