Saju Studio: Four Pillars

Your birth moment, computed exactly. Then read it yourself — or hand it to AI.

Saju Studio turns your birth date and time into a Korean four-pillar chart

(사주팔자), the same system known as BaZi in China and Four Pillars of Destiny

in the West. Every calculation runs on your device. Nothing is uploaded.

WHAT YOU GET FOR FREE

• Your four pillars — year, month, day and hour, with the Day Master that

rules your chart

• Luck pillars (대운) — your ten-year cycles, each with its ten-god relation

and twelve life stage, with the current cycle marked

• 80-year fortune curve — every year from age 1 to 80 in one line, with peak

years highlighted

• Day-pillar character card — share it as an image

• AI prompts — copy a complete, structured prompt into ChatGPT, Gemini or any

model you like. Traditional or plain-language style, five focus areas.

Your own chart stays free. Every style, every focus, forever.

WHY THE PROMPT MATTERS

Ask ChatGPT about your saju and it will guess your chart from your birthday —

and it gets the day pillar wrong. Solar terms, true local time and time zones

all change the result. We compute the chart correctly, then hand the model a

prompt that already contains it. You get a real reading instead of a plausible

one.

WHAT PRO ADDS (one purchase, yours for life)

• Vault — save a partner, a crush, your mother, your friends

• Compatibility — both charts computed correctly, side by side, with the

combinations and clashes between them

• One tap to compare with anyone you saved

No subscription. No ads. No account.

HOW WE CALCULATE

Year and month pillars follow solar terms, computed from the exact

astronomical moment — not from calendar months. Day and hour pillars follow

your local birth time, and you can set the birth time zone for anyone born

outside Korea. If you do not know your birth time, the hour pillar is

computed at noon and labelled as reference only.

Every result is deterministic. The same input always produces the same chart.

There is no model guessing behind the numbers.

PRIVACY

Charts are stored on your device. There is no account, no login, and no

server-side profile of you.

Saju is not a fixed fate — it is a map to understand yourself and read the

flow.