Ventilate: When to Open

Vivace App Studio

About this app

If the last few days have left you drained, sticky, and unsure what to do with your windows, you are not alone. When the heat will not let go, every choice feels heavy: open and let warm air in, or close and trap the warmth you already have? Ventilate is a calm guide for exactly that moment. It looks at your local weather, your indoor temperature, and each window in your home, then tells you when to close, when to open, and where to place a fan so cool air actually reaches you. No lectures, no guilt, just clear next steps when your head is too foggy to guess.

Built for real heatwaves
Per-window advice: close, crack open, open wide, or fan placement

Timing that follows the weather, not the clock
Fan guides matched to your layout (single-sided or cross-ventilation)

Gentle reminders before the next change
Heat toolkit: cool yourself, protect windows, and more

Set up once, then breathe
Point your phone at each window so the app knows which way it faces and what is outside. Add your indoor temperature when you can. A thermometer helps, but you can start without one.

Private by design
Everything runs on your device. No account. No ads. Your home stays yours.

When the evening finally cools, Ventilate helps you catch that window, before the heat builds again tomorrow.

What’s new

Welcome to Ventilate on Android.
• When to open and close your windows during a heatwave
• Fan placement tips for your home layout
• Per-window advice with next action times
• Home screen widget and helpful reminders
• Heat toolkit with 10 practical guides
• Track indoor vs outdoor temperature (7 and 30 days)
• Available in 8 languages. No account required.