Weather apps show forecasts. PrimeWindow shows opportunities.
Set the wind conditions you actually care about. PrimeWindow tracks your spots and sends a notification when a usable window appears.
Not another weather app. Built for clear calls, not more chart checking.
- Define your conditions once.
- PrimeWindow watches your spots.
- Get notified when a window opens.
No more refreshing forecasts all day to catch a two-hour window.
PrimeWindow alert
New Prime Window
Low winds at South Bay in 2 days.
Prime Window
06:40-08:10
South Bay
The problem
Forecast data is not decision clarity.
Raw data is useful, but it still leaves the hard part with you: deciding if it is actually on.
- You check two or three weather apps before breakfast.
- You compare models and graphs every hour.
- You still miss a short, usable window.
The reframe
Weather apps show forecasts. PrimeWindow shows windows.
You define your rules, PrimeWindow watches the forecast, and you get notified when the match appears.
Higher confidence
Lower confidence
Set your conditions
Define wind direction, speed, gust limits, rain, and daylight once.
PrimeWindow watches
It keeps checking your spots in the background across upcoming forecast windows.
You get the signal
A notification appears when your conditions line up and the window looks usable.
Built for wind-dependent sports
Built for people whose plans depend on the wind.
Paragliders
Know when your hill is actually on.
Paramotor pilots
Catch usable wind windows without constant checking.
Wind-dependent athletes
Set your thresholds and get a clear signal.
Why it matters
More clarity. Less checking.
PrimeWindow does not try to remove uncertainty. It helps you spend less time interpreting charts and more time acting when a real opportunity appears.
- Less time spent refreshing forecasts.
- More confidence about when it is worth going.
- Fewer missed short windows.
- Clearer calls with less second-guessing.
Decision view
Before
After
Why we built this
If you want the full context behind PrimeWindow, read the founder note.
Built for iPhone
On your phone. Right when it matters.
PrimeWindow is mobile-first and notification-led. While you are at work, travelling, or doing normal life, it keeps watch and only interrupts when your window appears.
No need to refresh forecasts all day.
Mam Tor
Tue, 14:00-17:00
Light NW · low gusts · no rain
State
Green = Go
Orange = Marginal
Red = No-go
Early access
Join the waitlist
PrimeWindow is pre-launch for iPhone. Leave your email to get early access when testing opens.