Real astronomy, made personal
Your birthday star
We match your birth year to a real star from the HYG astronomical database — its light has been travelling to you for exactly that many years.
AR sky mode
Point your phone at the sky and a live, world-locked map shows your constellation, the Moon, Sun and planets — with an arrow guiding you to your star.
Hear your star
Each star is sonified from its true physics — mass, radius and temperature — so no two stars sound alike.
Gift & keepsakes
Create beautiful posters, wallpapers and a guided “name under the stars” ceremony video to share with the people you love.
Star compatibility
Compare two people’s birthday stars and discover the light-years and constellations that connect them.
Wander the cosmos
A calm feed of astronomy wonders, a live sky calendar of meteor showers and eclipses, and daily sky moments.
Every star is real
Birthday Star does not invent stars. Each one is a real, catalogued object mapped from the HYG astronomical database. The app works offline, respects your privacy, and never sells your data.