Aerzeit: When to Open Windows
Beat damp, mold, and pollen
About
This app analyzes outdoor conditions for the next 48 hours to identify optimal times for ventilation. It allows customization of temperature ranges and environmental factors like rain, humidity, and pollen to help you decide when to open windows.
What's New in Aerzeit
0.14.12
October 30, 2026
The refresh buttons now show how old your forecast is in your own language. The list's Edit and Done buttons are translated too, with an icon instead where the word doesn't fit.
MoreSubscriptions & In-App Purchases
Aerzeit Premium
Live open-window alerts. No ads. No tracking.
FAQ
What is Aerzeit's primary function?
Aerzeit analyzes the next 48 hours of outdoor conditions to suggest optimal times for opening windows, based on your preferred temperature range and other environmental factors like rain, humidity, and pollen.
Does Aerzeit provide medical advice?
No, Aerzeit reports public weather and environmental data as a comfort tool, not medical advice. If you have health conditions affected by air quality or pollen, consult your clinician.
How does Aerzeit handle user privacy?
Aerzeit is designed with privacy in mind. It avoids required-reason APIs, does not read your phone's language setting, and sends minimal data to its server without accounts, identifiers, or tracking. All your settings remain on your device.
What devices is Aerzeit compatible with?
Aerzeit is available for iPhone, iPad, and Apple Watch, with a companion Apple Watch app and complication for at-a-glance status.
How often is Aerzeit updated?
The latest version, 0.14.12, was released on October 30, 2026, indicating regular updates to improve functionality and data accuracy.
What are the subscription options for Aerzeit?
Aerzeit offers a 'Aerzeit Premium' subscription for $9.99 per year, providing access to advanced features and potentially enhanced data or services.
Does Aerzeit have ads?
No, Aerzeit is ad-free. The description explicitly states 'No advertising' and 'No third-party SDKs beyond a small geospatial maths library'.
Can I use Aerzeit offline?
While Aerzeit requires an internet connection to fetch forecast data, its core functionality and settings are designed to be efficient. The app focuses on presenting outdoor conditions, and specific offline capabilities are not detailed.
