HydroniCalc vs PipeQ
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HydroniCalc
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HydroniCalc brings together 23 hydronic calculators for heating engineers and installers of water-based heating systems. Everything runs in metric units, offline, and without an account. The calculators are grouped into four families: • Basic hydraulics and pipework: power, flow and temperature difference, diameter and velocity, linear and fitting pressure losses. • Valves, balancing and circulator: the Kv / flow / pressure-drop relationship, valve sizing, balancing, and the pump operating point. • Pressurization, volumes and separation: fill pressure, water expansion, expansion vessel, and system volumes. • Radiators and underfloor heating: radiator output correction, sizing, and underfloor loop length. Each calculator shows the values to enter and displays the result as soon as the required data is valid. An info button explains the purpose of the calculation, the expected inputs, the method, the results, and the usage limits. Built-in Kv tables: look up the Kv values published by manufacturers (manufacturer, product, and generation), then copy a value to paste into your calculation. The tables never fill a calculation automatically; the value is always typed or pasted into the field. Recent calculations: your ten most recent successful calculations are stored locally, so you can find them again and resume them with their values. Eleven calculators are free to use. A single, non-subscription purchase permanently unlocks the other twelve for the Apple account used. If a purchase isn’t recognized, “Restore Purchases” asks the App Store to sync it again.
PipeQ
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PipeQ provides engineering calculations for pipe flow analysis, pressure loss, flow measurement, valve sizing, and fluid system calculations. Designed for piping engineers, mechanical engineers, process engineers, HVAC engineers, technicians, and engineering students. Calculators Included Pressure Drop Calculators • Pressure Drop Calculator • Air Pressure Drop Calculator • Natural Gas Calculator • Gas Pressure Drop Calculator • Gas Offtake Calculator • Pump Performance Calculator Calculators for Pressure Differential Flow Devices • Orifice Plate Calculator • Venturi Tube Calculator • Nozzle Calculator • Prandtl Probe Calculator Quick Engineering Calculators • Pipe Diameter Calculator • Reynolds Number Calculator • Resistance Factor (K) Calculator • Control Valve Calculator • Gas Control Valve Calculator • LPG Calculator • Pipe Wall Thickness Calculator • Thermal Energy Calculator Features • Metric and Imperial units Switch between different engineering unit systems. • Built-in databases Select standard pipes, fluids, and pipe materials from built-in lists. • Gauge and absolute pressure Use the pressure reference required for your calculations. • Excel and PDF export Export calculation results for documentation and sharing. • Save and continue later Save calculations and continue your work anytime. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
HydroniCalc and PipeQ are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. HydroniCalc sells 1 one-off in-app purchase and PipeQ sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.
| Parameter | HydroniCalc | PipeQ |
|---|---|---|
| Price | Free | Free |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 7 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | Eric Chmara | Shenzhen Seize Times E-Commerce Co., Ltd. |
In-app purchases
HydroniCalc
- Unlock All Calculators$12.99
PipeQ
- PipeQ Pro Monthly$1.991 Month
- PipeQ Pro Yearly$19.991 Year
- PipeQ Pro Lifetime$29.99








