Compare two days
The world between you.
Partners, parent and child, best friends. Two arrival days, side by side.
Two days, side by side
What you’ll
see.
The weather outside
The temperature, rain and daylight in each birthplace, from historical climate records.
The sky that night
The moon on each night, how much of it was lit, and the planets above each city.
The #1 songs
The U.S. Billboard #1 on each birthday, with a preview of both.
What a dollar bought
One receipt for both days: bread, eggs, milk, gas, a stamp and a home, then and now.
Your lives in numbers
How many more sunrises, heartbeats and full moons the older one has seen.
Born under
Star signs, Chinese zodiac animals, birthstones, flowers and generations, side by side.
About comparing days
Good to
know.
How do I compare two birthdays?
Add each person’s birth date and the city they were born in, then tap Compare. You’ll see both days side by side: the weather, the moon, the #1 song, what things cost and how many days apart you are. Names are optional.
Who is it for?
Anyone with two days worth putting next to each other: partners, a parent and child, siblings, grandparents and grandkids, best friends. It also makes a sweet anniversary or Mother’s Day surprise.
Is it free?
Yes. The weather, the moon, the #1 songs, the prices and your lives in numbers are free, with no account. One one-time payment unlocks every chapter of both days, with a certificate for each person.
What is in the full comparison?
Everything in each person’s day: the news, birthday twins, how common your names were, how many people were born that day, the stock market, NASA’s picture of the day, who was in space, the latest technology and who led each country.
Can we be born in different countries?
Yes. Each day uses its own city for the weather and the sky. The song chart and the prices are from the U.S., so the two days are compared on the same scale.
Can I send the comparison to the other person?
Yes. Every comparison has a share link, and from your own day you can send an invite so they add their birthday themselves.