Open Window
A small fresh-air timing app that helps you decide whether to open now, open briefly, or keep the window closed.
What It Does
One clear answer
Open now, open briefly, or wait. No map-reading required.
Source confidence
The app shows whether the reading came from an official station, model forecast, or cached data.
Private by default
No account, no tracking profile, and recent history stays on your device.
Plus
Open Window Plus is planned for saved places, compact trends, shorter refresh intervals, and optional weather-aware adjustment.
Basic fresh-air timing should remain useful for free users. Paid features are for extra convenience, not for hiding the core answer.
Accuracy
Outdoor air-quality data can vary by region, provider coverage, station distance, and forecast model availability. Open Window is a practical decision aid, not a medical, safety, or emergency alert service.
When data is old, cached, incomplete, or low confidence, the app is designed to become conservative and avoid sending open-window alerts.