What Is Saju Compatibility?

Saju compatibility (궁합, gunghap) compares the Four Pillars of two people to understand how their elemental energies interact. It goes far beyond "compatible or not" — it reveals where synergy exists and where friction may arise.

The Three Key Factors

1. Day Master Relationship

The most important comparison is between the Day Masters (the Heavenly Stem of each person's Day Pillar). Key relationships include:

  • Combination (合): Natural attraction — you complement each other effortlessly
  • Clash (沖): Tension and conflict, but also catalyst for growth and change
  • Generation (生): One person supports the other — stable but potentially one-sided

2. Elemental Balance

When one person's chart fills an elemental gap in the other's, the relationship tends to feel balanced and mutually supportive. For example, if you lack Fire and your partner has strong Fire, they energize you.

3. Useful God (用神) Interaction

The "Useful God" is the element your chart needs most. If your partner naturally provides your Useful God, the relationship tends to be deeply nourishing.

Romantic Compatibility

For romantic relationships, additional factors come into play:

  • Peach Blossom Star: Indicates romantic attraction and charisma
  • Red Charm Star: Intense romance energy
  • Day Branch relationship: Since the Day Branch represents the spouse position, harmony here suggests everyday compatibility

Business Compatibility

For professional partnerships, focus on:

  • Output stars: Creative synergy and idea generation
  • Wealth stars: Financial management style compatibility
  • Officer stars: Leadership dynamics and organizational harmony

AI Compatibility Analysis

AI-powered compatibility analysis offers:

  • Systematic review of all pillar combinations between two charts
  • Quantitative scoring across harmony, clash, combination, penalty, and destruction
  • Relationship-type-specific interpretation (romantic, business, friendship)
  • Actionable advice for strengthening the relationship

Try It on CatchSay

Enter both birth dates and times on CatchSay, and the AI generates a comprehensive compatibility report — including an elemental balance chart, relationship strengths and challenges, and personalized advice for growing together.