ZEROBASEONE · Bias match
Korean Saju reads compatibility from two birth charts — not sun signs. Enter your birthday and see your match type with Matthew in 10 seconds. Free.
Matthew is The Sunlit Blade — a Yang Fire Day Master (the core element of their Four Pillars). That's the chart we'll read yours against.
Free · your birthday stays on your device
Saju (사주, "Four Pillars") maps your birth date and time to five elements. Compatibility compares two people's day pillars — the part that rules relationships — to score chemistry, stability, growth and friction. Matthew's chart is fixed; yours is calculated live in your browser (your birthday never leaves your device).