See the heat. Compare your outdoor plans.

Understand heat index and wet-bulb estimates, then compare the full duration of the times you have in mind. For walks, runs, bike rides and everyday outdoor plans.

Explore the features Get support

Preparing for the App Store. The app’s current display name is Heat Window.

Heat Planner Pro sample Conditions screen with wet-bulb estimate, temperature and humidity — Native app preview · illustrative sample, not a live forecast

Look beyond the starting temperature.

Understand the forecast

See heat index when applicable, estimated wet-bulb temperature, air temperature and humidity, with wind and rain context.

Compare complete windows

Choose 30–180 minutes and compare two start times in Preview or up to three with Pro. See the peak and average across the whole activity.

Keep a plan you can revisit

Pro adds saved places, saved plans, sharing and local reminders to recheck conditions. Your existing records stay readable after your subscription ends.

One clear Preview. More planning with Pro.

Free Preview

Explore the labeled offline sample as often as you like. Your real Preview is one place, one fixed 12-hour snapshot and one successful comparison of two start times. No refresh or new saved plan is included.

A snapshot older than two hours cannot create a new comparison. Failed initial fetches or comparisons do not spend the allowance. Your retained result stays readable.

Pro

Plan across the next 72 hours. Compare up to three starts, save up to 10 places and 100 plans, and keep up to 20 local reminders. Refresh forecasts, share comparisons and save an image.

US launch prices: $1.99/week · $3.99/month · $19.99/year. All periods include the same features.

Auto-renewing subscriptions. Local price and billing period are shown before purchase. No introductory trial. Manage or cancel in your Apple Account.

Forecast context, with clear limits

Lower forecast heat does not mean an activity is safe. Estimates are not on-site measurements, medical advice, a numerical WBGT reading or a workplace-compliance assessment. Activity labels do not personalize heat limits. Check official local guidance and actual conditions.

No app account is required. Plans are stored on your device; weather requests send approximate coordinates or your search text to the weather service. Fresh forecasts require internet access. Local reminders do not monitor weather changes or official warnings.