Luften
Know when to open the window
Free · Designed for iPad. Not verified for macOS.
Fresh air at the right time. Luften compares the weather at your address with your room's temperature and tells you when to open the window.
Luften compares the weather at your address with the temperature in your room and tells you what to do with the window: open it, air the room for a few minutes, or keep it closed. On hot, sunny days it also tells you when to lower or raise your external blinds.
OPEN, AIR OR KEEP IT CLOSED
When it's cooler outside and your room is warmer than you like, open up. When it's warmer outside, keep it closed. Below 10 °C, Luften suggests airing briefly instead of leaving the window open. Storms, strong gusts, rain, snow and muggy air keep the window shut, and a humid room gets aired when the air outside is drier. The thresholds follow guidance from MeteoSwiss, the German Weather Service, the German Environment Agency and REHVA.
BLINDS BEFORE THE HEAT
Tell Luften which way your window faces, once, with the compass. It then knows when the sun actually reaches that window and tells you to lower the blinds before the heat gets in, and to raise them once the sun has moved on, after sunset, or when gusts get strong.
YOUR HOME SENSORS
No sensor needed. With a temperature sensor in the Home app, Luften uses the real reading; a humidity sensor makes the advice better still.
THE WHOLE DAY
A 24-hour forecast shows the hours where the advice changes, so you can see the cool evening coming.
WITHOUT OPENING THE APP
• Home Screen widget
• Alerts only when the advice changes
• An airing timer as a Live Activity on the Lock Screen and in the Dynamic Island
• A Shortcuts action to keep the room temperature current in the background
YOUR COMFORT
Set your comfortable room temperature between 18 and 25 °C. Tap any temperature to switch between Celsius and Fahrenheit.
PRIVATE BY DESIGN
No account. Your Home sensors are read on your device, only while Luften is open. Apple Weather gets the coordinates of the address you save, and nothing goes to the developer.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Marco Luthi, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Marco Luthi
- Size
- 3.9 MB
- Category
- Weather
- Compatibility
Requires iOS 18.5 or later.
- iPhone
Requires iOS 18.5 or later. - iPad
Requires iPadOS 18.5 or later. - Mac
Requires macOS 15.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.5 or later.
- iPhone
- Languages
- English and German
- Age Rating
4+
- 4+
- Copyright
- © 2026 Marco Lüthi