Mio's Compatibility Notebook | Hoshitoko

What is our true compatibility?

Classical Compatibility Reading | Free · No Sign-Up

Choose Your Relationship

No birth time or name needed

YouBirth date

Person A

The other personBirth date

Person B

Birth dates are calculated strictly inside this device—never stored or transmitted. Your result URL never exposes any birth dates.

Eastern Calendar Meets Western Stars—From Birth Dates Alone

Mio's Compatibility Notebook reads your interpersonal distance and role balance from the Four Pillars Day Pillar (your birth day's stem-branch) and your shared values and vibe from Western Sun signs. Result links never contain birth dates, making them safe to share on X or LINE.

For the 12-sign guide or precision synastry with birth time, visitZodiac & Stem-Branch Compatibility Guide + Precision Synastry, and the Day-Stem pairing chart in Four Pillars Day-Stem Compatibility Chart.

Frequently asked questions

Can we still get a reading without knowing our birth times or names?

Yes. You only need to select your relationship (partner, crush, or friend) and two birth dates. Names, gender, and email addresses are not required.

How is compatibility calculated?

We combine the Four Pillars Day Pillar (Stem Harmony, Five-Element cycles, and Branch Harmony, Trine, or Clash from Sanming Tonghui Vol. 2) with Western Sun-sign aspects (Ptolemy’s Tetrabiblos Book I) to interpret 12 compatibility types and traits.

Are the birth dates we enter ever saved or made public?

Entered birth dates are used for calculation solely inside this browser and are never sent to our servers. Neither result URLs nor share images contain birth dates or personal data.