Richtig lüften is a free Android app developed by Lausitz Software in the Utilities & Tools category. The app helps prevent mold formation by providing a recommendation for optimal ventilation. It calculates the new humidity level after ventilation based on the indoor and outdoor temperature and humidity. Although the calculated value is theoretical, it helps to identify a tendency. The app requires an internet connection to display ads and fetch weather data from Openweathermap.org. However, it can also work offline without ads and weather data.

It is worth noting that the app uses Google AdMob to display ad banners, which may collect anonymized data and store cookies on the user's device. Users who prefer not to see ads can purchase the ad-free version of the app. For any questions or suggestions regarding the app, users can contact Lausitz Software via email at