Saju Studio: Four Pillars

Read your chart. Make today your own.

Saju Studio helps you explore Korean saju, also known as BaZi or the Four Pillars of Destiny. Start with a birth chart calculated on your device, then explore your five elements, day-pillar character and daily flow. No account is required.

YOUR SEASONAL LIBRARY
Move between Today, My Saju, People and Journal. Open today's story and the weekly overview. See three things to try and three to ease off each day, plus a look at tomorrow in the evening, and get one thing to try in your morning notification. Record a thought and return to your own notes. Choose a light or dark theme in Settings.

SEE YOUR FIVE ELEMENTS
Wood, Fire, Earth, Metal and Water appear as five textured pillars, with heights reflecting their distribution in your chart. Meet your day-pillar character, explore your Day Master and full chart, and view ten-year luck pillars and the age 1–80 flow curve. A seven-day introduction helps you get to know your day pillar.

YOUR CHART, FOR FREE
• Year, month, day and hour pillars, with an unknown-hour option
• Five-element distribution and chart details
• Ten-year luck pillars and the long-term flow curve
• Daily and weekly reference readings
• Day-pillar characters and share cards
• Structured prompts to copy into an AI chat of your choice

PEOPLE AND PRO
Save charts for family, friends or a partner and compare combinations and clashes. Invite someone close and, once you connect, see today for both of you under "Today, together" on the Today tab. Up to 5 invited connections are free. Pro is an optional one-time purchase that adds saved charts and compatibility features. There is no recurring subscription.

OPTIONAL AI REPORTS
In-app reports can be purchased individually: a personal overview, a focused reading about relationships, work or money, and a 2027 yearly reading. Pro purchasers can claim one personal overview at no extra charge. Additional reports are separate purchases. Check availability, price and terms in the app before buying. AI reports are currently provided in Korean.

HOW YOUR CHART IS CALCULATED
Year and month pillars follow solar terms. The calculator includes historical Korean standard-time and daylight-saving adjustments. You can select a birth time zone for a birth outside Korea. If the birth hour is unknown, the app leaves the hour pillar unspecified rather than inventing one. Chart calculations are separate from optional AI-generated interpretations.

PRIVACY AND CHOICE
Basic chart calculation and storage of saved charts and journal entries take place on your device. Chart invites carry only your chart's eight pillar characters and an optional name you type, never your birth date or time, and they are not sent to our servers. If you request an optional AI report, the app asks for consent before sending your chart's pillar characters and selected topic to a server for AI generation. Your birth date, birth time and name are not sent with that request. Purchase information is also sent for payment verification. Completed reports are saved on your device; temporary server copies are deleted within 24 hours. Pseudonymous usage analytics can be turned off in Settings.

No ads. No signup. No subscription. Some features and AI reports require payment. AI-generated text can contain errors and can be reported in the app. Saju is a tool for reflection, not a fixed prediction or a substitute for medical, legal or investment advice.