Changing weather creates opportunities to naturally cool or warm your home. WindowWise finds those moments and sends you notifications to open and close your windows to maximize your energy savings.
Free download · Free forever for the core experience
See how it works →Most spring and fall mornings — and many summer dawns — outdoor air is already cooler than your house. That's free cooling leaking past closed windows. Same in winter afternoons when the sun warms outdoor air above your thermostat. WindowWise pings you at the moments that actually matter, and stays quiet the rest of the time.
On a hot day we wake you for the 64°F dawn. On a cold one, we ping you when the afternoon sun has warmed outdoor air above your thermostat. The math is done for you — you just open a window.
We watch the forecast and tell you the moment outdoor temperature is about to cross your indoor — close then and the morning's cool stays banked all day instead of bleeding back out.
Show a QR on your phone. Anyone in the house scans it. Done — every device in your household sees the same windows-open state and gets the same alerts. No accounts, no email, no logins. Free.
On iOS we use the same WeatherKit feed as the iPhone's native Weather app — matches digit-for-digit. On Android, macOS, and Windows we route the same WeatherKit data through our backend so your numbers agree.
Walked out the door with windows open on a 95°F day? We alarm — even during quiet hours. Stops your A/C from cooling the neighborhood while you're at work. The kind of thing the app exists to catch.
When indoor + outdoor are both pleasant and air quality is good, we'll invite you to open up just to enjoy the breeze. AQI-aware — silent when pollen counts spike or wildfire smoke rolls in.
One temperature, big and clear. A short, plain-English sentence telling you what to do next. No dashboards screaming numbers, no cheerful gamification, no graphs you don't have time to read.
The backdrop animates with the time of day, season, and weather — sunrise behind a coastal cliff in the morning, light rain on the glass in the afternoon, snow drifting past at dusk. Glance once, you know everything.
We built WindowWise because we kept missing the cool morning air. The forecast lives on your phone. The windows live in your house. Nothing tells you when those two things add up to free money sitting on the table. Now something does.
Free download. Free forever for the core experience. Available on every device the family uses.
Optional Premium ($3.99 one-time, household-wide) adds savings dashboards and smart-thermostat write-back. Never anything that prevents waste — that's all free.
WindowWise