Open Window vs Open/Shut

Practical weather information for the day. Open Window uses the forecast to answer everyday questions: what to wear, whether to take an umbrella, when to open a window, and what changes to expect. Included Features • Current weather guidance for outfit, umbrella, ventilation, and outdoor comfort • Temperature, air quality, wind, humidity, rain, and UV details • Current-location weather that updates as you move when location access is allowed • The main current-weather screen remains available after the preview ends 3-Day Preview • Today's weather summary at 3 a.m. and a remaining-day summary at 4 p.m., based on the selected place's local time • Important weather-change alerts for your current place • A basic Home Screen widget Open Window Plus • Continued weather alerts and widgets after the 3-day preview • Custom summary times and quiet hours • Up to four saved places with sorting and place-specific alerts • Detailed hourly views for temperature, air quality, wind, humidity, rain, and UV • Up to 10 days of forecasts, including today • Widgets for multiple places • Direct access to the matching place from an alert or widget • An option to skip repetitive default summaries when there is no meaningful weather change (In-App Purchase) Plus is available as a monthly or yearly auto-renewing subscription. Price and any available offer are shown before purchase. Subscriptions renew automatically unless canceled in your Apple account settings. Location and Privacy • No account is required • Weather data comes from Apple Weather • Air-quality details may be supplemented by the Open Window server where available • Location is used only for app features and optional alerts, not for tracking Device Support • Supports iPhone, iPad, Mac, Apple TV, and Apple Vision Pro • Feature availability varies by platform - Contact: help@paran.app - Terms of Use: https://paran.app/open-window/terms - Privacy Policy: https://paran.app/open-window/privacy/

Open or shut? During a heatwave, everyone answers this question with instinct, and instinct is wrong. We open the windows when the weather feels nice, while the air outside is hotter than inside. We let in air that feels dry, while it actually carries more water. Open/Shut ends the guessing. ONE GLANCE, ONE ANSWER A full-screen verdict, updated in real time: OPEN or SHUT, with the reason in one sentence. No charts to interpret, no thresholds to configure. PHYSICS THAT IS ACTUALLY RIGHT Relative humidity is misleading: hot afternoon air can show a low percentage while holding more water than your living room. Open/Shut compares absolute humidity, the grams of water per cubic metre, indoors and out. Airing never trades a cool room for a damp one. IT KNOWS YOUR HOME Describe your windows once: "garden side", "bedroom skylight". When the verdict is OPEN, the app crosses the wind direction with your façades and tells you which openings to use for cross-ventilation, in your own words. It also learns your building's thermal inertia and estimates the indoor temperature between your readings. IT PLANS AHEAD An hourly timeline shows the next favorable window over the coming hours, and a notification arrives at the exact moment conditions flip. Open at the right time, not when you happen to think about it. SUMMER AND WINTER In summer, flush out the heat as soon as the evening air turns cooler. In winter, air strategically to fight condensation and mould without throwing your heating out the window. PRIVATE BY DESIGN No account, no backend, no tracking. Your location is only used to fetch your local forecast. Free, with no subscription. Open/Shut. An open-and-shut case.