Aerzeit: Window Airing Timer

Open up at the right time

Free · In‑App Purchases · Designed for iPad

Know the right moments to open your windows for fresh air — timed around the weather, so you open up when it's worth it and rain-free. No accounts, no tracking. Aerzeit tells you when to open your windows so outside air becomes inside air at the temperature you want. It reads the local forecast and points to the moments worth opening up — working around the weather so you're not airing the house into a shower. WHAT IT DOES Pick the outdoor temperature range you'd be happy to let in. Aerzeit watches the local 48-hour forecast and tells you when conditions match — twice a day, morning and evening. Turn on the rain filter to skip the openings when showers are forecast, so you only hear about the windows of time actually worth using. Optional filters for humidity, wind, air quality, pollen and UV let you tune it to what matters to you. Tap "Use current location" to set a spot to roughly 1 km precision, or search for a town. WHAT IT DOESN'T DO Aerzeit doesn't model your home — it reports the outdoor conditions and leaves the judgment to you. Opening, sizing and timing the actual airing is yours. It reports public weather and environmental data (including air quality, pollen and UV) as a comfort tool, not medical advice; if a health condition makes any of those matter for you, follow your clinician's guidance. PRIVATE BY DESIGN - Empty Privacy Manifest. The app calls none of Apple's required-reason APIs. - Minimal data. To fetch a forecast, the app sends a roughly 3 km grid cell to a server in the EU — no account, no identifiers, no raw GPS, no history. Your temperature range and all your filter settings stay on your device. The data export (Settings → Export my data) shows exactly what's held — it's all on your phone. - No accounts. No analytics. No tracking. No advertising. No third-party SDKs beyond a small geospatial math library. MADE INDEPENDENTLY Aerzeit is built and published by Samuel Harrold, based in Indianapolis, Indiana, USA. Cultural reference: Stoßlüften — the German habit of a short, brisk airing-out — adapted for anywhere the weather gives you a window: between the humidity, the rain and the AC season, the trick is timing it right. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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The developer, Samuel Harrold, 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 Linked to You

    The following data may be collected but it is not linked to your identity:

    • Location

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Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

For more information, visit the developer’s accessibility website .

Information

Seller
  • Samuel Harrold
Size
  • 11 MB
Category
  • Weather
Compatibility
Requires iOS 16.4 or later.
  • iPhone
    Requires iOS 16.4 or later.
  • iPad
    Requires iPadOS 16.4 or later.
  • Mac
    Requires macOS 13.3 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English
Age Rating
9+
In-App Purchases
Yes
Copyright
  • © 2026 Samuel Harrold
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More