Bias Compatibility
Add your bias’s public birthday and the Moon Rabbit checks how your saju charts click.
Free · No sign-up · Birthdays stay on this device
You
Just for fun. Results aren’t connected to any real person, and this site holds no celebrity names, photos or data. Enter a publicly known birthday yourself.
How bias compatibility works
We take your saju (from the birthday saved on this device) and your bias’s public birthday and run the same compatibility math as our saju match card: how the characters that stand for each of you relate, how your partner seats (day branches) pull together or clash, how much each of you fills the other’s missing elements, and the links and bumps across the rest of your charts. The result is a score from 40 to 98. Since idols rarely share their birth time, their chart uses six characters instead of eight.
Your chemistry type comes from how your two core elements relate. Stage style comes from your bias’s element, fan-service type from the character that stands for them, and your fan type from your own element.
This site has no celebrity names, photos or lists. Results are just for fun and aren’t connected to any real person.
Bias compatibility FAQ
Does this site have real idol data?
No. There are no celebrity names, photos or lists here. You type in a birthday you already know is public, and give your bias whatever nickname you like. Results are just for fun and aren’t connected to any real person.
How is the score calculated?
It’s the same math as our saju match card: how your core characters relate, how your partner seats (day branches) pull together or clash, how you fill each other’s missing elements, and links across the rest of your charts. You get a score from 40 to 98, split into talk, spark, rhythm and balance.
Is my bias’s birthday saved?
Not automatically. Only if you tap “Save as a person” does it go into the people list on this device. Birth dates are never sent to our server or put in share links.
Do I need their birth time?
No. Idols usually don’t share their birth time, so we only ask for year, month and day and read six of the eight characters.
Can I get a deeper compatibility reading?
For someone in your real life, like a partner or friend, the two-person reading (1 Tteok) reads both full charts in depth. You’ll see a free preview first.