Comparison

Lüftungstool vs HydroCalc

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Lüftungstool

Features
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Diverse Berechnungstool für Lüftungskanäle und Lüftungsrohre. Eingabemöglichkeiten und Funktionen siehe Screenshots. Eingabe-/ Auswahlmöglichkeiten: • Lüftungsrohr von 80 bis 1250 mm • v von 0,5 bis 20 m/s • ϑ von 0 bis 60 °C • φ von 1 bis 100 %

About

HydroCalc

Features
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HydroCalc is a calculation aid for heating and HVAC technicians. Calculate flow from heat output and temperature difference alongside the existing hydraulic calculators. CIRCUIT PROJECTS Create named projects and group circuits by room, category or floor. Record heat output, temperature difference and input sources for each circuit. View total heat output and required flow together. BASELINE AND COMPARISON Capture a fixed baseline and edit later proposals independently. Review differences in totals and share a calculation worksheet with inputs, sources and comparison. German and English. Local projects and calculations work offline. Existing purchase unlocks remain available. 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/ COMMISSIONING VISITS Record measured flow for each circuit and compare it with the design targets frozen when the visit is saved. An adjustable project tolerance makes deviations clear. Earlier visits remain unchanged after later design edits. Calculated targets and measured values stay separate.

Screenshots

Lüftungstool4 screens

Verdict

The call

The clearest difference is price: HydroCalc at Free against Lüftungstool's $2.99. Lüftungstool's advantage is in-app purchases (none vs 1) and iOS requirement (15.2 vs 17.0). On update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

HydroCalc is free to download; Lüftungstool costs $2.99 up front. HydroCalc sells 1 one-off in-app purchase. Lüftungstool asks for nothing beyond the download.

UpkeepUpdate frequency

Lüftungstool ships an update every 3 weeks, HydroCalc every 5 weeks. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 3 level
Lüftungstool versus HydroCalc: the parameters behind the verdict, then further details
ParameterLüftungstoolHydroCalc
Price$2.99Free — better
Update frequencyEvery 3 weeks — betterEvery 5 weeks
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.2 — better17.0
Further details — not scored
Size6 MB2 MB
Age rating4+4+
DeveloperBurak DoelekPiotr Kaminski

In-app purchases

None

Lüftungstool

No in-app purchases

1 purchases

HydroCalc

One-time1
  • HydroCalc Pro$3.99

Questions

Is Lüftungstool free?
Lüftungstool costs $2.99, with no in-app purchases.
Is HydroCalc free?
HydroCalc is free to download, with in-app purchases available.
Do Lüftungstool or HydroCalc have ads?
Neither Lüftungstool nor HydroCalc shows ads.
Which is updated more often, Lüftungstool or HydroCalc?
Lüftungstool ships an update every 3 weeks, and HydroCalc every 5 weeks. Most recently, Lüftungstool was updated on October 25, 2026 and HydroCalc on October 31, 2026.

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