The Birth Letter

Free tool

Moon sign compatibility: how you two feel things

Two birth dates. How each of you feels things and what each of you needs – no scores, no verdicts.

Who is it?

You

Them

Birth dates from 1930 to 2026.

What your Moons show

Your Sun sign is how you show up. Your Moon sign is how you feel: what you need to feel safe, and what you do when a feeling gets close. Two people’s Moons show how each of you feels things, and why the same moment can land so differently for each of you. It says nothing about whether you belong together – only how to understand each other.

Your Moon sign and phase on its own →

Questions

Do we need our birth times?

No. A birth date gives the Moon’s sign on most days. The Moon changes sign every two to three days, so if it changed on one of your birthdays, the tool shows both and lets you choose, or leave it as “not sure”.

Is this a compatibility score?

No. There are no scores and no verdicts. It describes how each of you feels things and what helps each of you feel close.

Is it free? Do you keep our birth dates?

It’s free, with no email and no sign-up. The Moons are worked out on your phone; the dates are not sent to us. If you send the result to someone, the link carries only your first names, who they are to you and the two Moon signs.

Your Moon is one part. Your letter is written for all of you.

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