# ULT vs Lüftungstool

The clearest difference is price: ULT at Free against Lüftungstool's $2.99. ULT also leads on iOS requirement (13.0 vs 15.2). Lüftungstool's advantage is update cadence (every 3 weeks vs every 14 months). On ads, in-app purchases and device support there is nothing between them.

ULT is free to download; Lüftungstool costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ULT ships an update every 14 months, Lüftungstool every 3 weeks. The most recent releases landed on October 14, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | ULT | Lüftungstool |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 3 weeks** |
| Size | 11 MB | 6 MB |
| Requires iOS | **13.0** | 15.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Stefan Jakschik](https://appshunter.io/developer/1564456337) | [Burak Doelek](https://appshunter.io/developer/1602361104) |

## What reviewers say

### ULT

[App page](https://appshunter.io/ios/app/ult-calculator/id1564456335)

**Features:** macOS Compatibility

**In-app purchases:** none


### Lüftungstool

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

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

**In-app purchases:** none


## Frequently asked questions

### Is ULT free?

ULT is free to download, with no in-app purchases.

### Is Lüftungstool free?

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

### Do ULT or Lüftungstool have ads?

Neither ULT nor Lüftungstool shows ads.

### Which is updated more often, ULT or Lüftungstool?

ULT ships an update every 14 months, and Lüftungstool every 3 weeks. Most recently, ULT was updated on October 14, 2026 and Lüftungstool on October 11, 2026.

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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.*