HydroniCalc vs MAGCalc
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.
MAGCalc
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MAGCalc helps heating and HVAC technicians size membrane expansion vessels and prepare precharge and filling pressures. WATER SIZING Record system volume, temperature, static height and safety valve pressure. Estimate water expansion and view the next standard vessel size. INSTALLATIONS AND SCENARIOS Save named installation projects with location notes. Create and duplicate independent scenarios, select a reference and compare results. Keep input sources and assumptions with each scenario. Share a calculation record containing inputs, results and differences. German and English. Calculations and local projects work offline. MAGCalc Pro unlocks manual expansion calculations for glycol, solar fluids and special media through a one-time in-app purchase. Water sizing and project management are available without that additional purchase. Professional calculation aid: manufacturer data, applicable rules, system design and actual measurements take precedence. Check results against the real installation. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
HydroniCalc and MAGCalc 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 MAGCalc sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
| Parameter | HydroniCalc | MAGCalc |
|---|---|---|
| Price | Free | Free |
| Update frequency | — | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 7 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Eric Chmara | Piotr Kaminski |
In-app purchases
HydroniCalc
- Unlock All Calculators$12.99
MAGCalc
- MAGCalc Pro$3.99









