Know when the stars are worth chasing
ClearNight gives you a single clarity score for tonight's sky — based on cloud cover, moon phase, seeing, and light pollution — so you always know before you go.
ClearNight gives you a single clarity score for tonight's sky — based on cloud cover, moon phase, seeing, and light pollution — so you always know before you go.
Built for astronomers, astrophotographers, and anyone who looks up.
One number combining cloud cover, moon phase, atmospheric seeing, and Bortle light pollution into a single Excellent/Good/Fair/Poor rating.
Find the clearest window between dusk and dawn — not just whether tonight is clear, but exactly when to be outside.
See the week ahead at a glance. Plan around your schedule, not just tonight's weather.
Know which objects are worth chasing tonight — planets, deep sky, meteor showers — with rise/set timing and direction.
Set a threshold and get notified the evening before or day of when conditions hit your score. Never miss a clear night.
Save your home, your dark sky spot, and anywhere else. Switch between them instantly and compare forecasts side by side.
We combine four factors into a 0–100 score, then translate it into a simple rating so you never have to do the math.
The biggest single factor. Even thin cloud cover scatters light and ruins transparency.
A full moon washes out faint targets. New moon nights score significantly higher.
Light pollution from cities. Bortle 1–3 is dark sky territory; 8–9 is bright urban sky.
Air turbulence at altitude. Poor seeing blurs stars and planets even on a clear night.
Start free. Upgrade when you're ready.
Plan ahead, chase every GO window, and get a nudge the moment the sky opens up.
Plans are purchased inside the app. Includes a 7-day free trial.
