# Lüftungstool vs HydroniCalc

The clearest difference is price: HydroniCalc 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 ads and device support there is nothing between them.

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

## The numbers

| Metric | Lüftungstool | HydroniCalc |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | — |
| Size | 6 MB | 7 MB |
| Requires iOS | **15.2** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Burak Doelek](https://appshunter.io/developer/1602361104) | [Eric Chmara](https://appshunter.io/developer/1892404568) |

## What reviewers say

### Lüftungstool

[App page](https://appshunter.io/ios/app/luftungstool/id1603666086)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### HydroniCalc

[App page](https://appshunter.io/ios/app/hydronicalc/id6796810526)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Calculators | $12.99 | one-time |


## Frequently asked questions

### Is Lüftungstool free?

Lüftungstool costs $2.99, with no in-app purchases.

### Is HydroniCalc free?

HydroniCalc is free to download, with in-app purchases available.

### Do Lüftungstool or HydroniCalc have ads?

Neither Lüftungstool nor HydroniCalc shows ads.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*