Can I open the windows yet?
Air Out Yet? reads the temperature from the sensors you already have in Apple Home, compares it with the temperature outside, and answers the one question you actually have on a hot day. The widget sits on your Home Screen and flips on its own as the forecast changes — it tells you what time to open, and what time to close again.
It also knows the heating season, when the question stops being “can I cool the flat down” and becomes “how long should the windows stay wide open”.