Korean Four Pillars of Destiny (사주, 四柱) — global edition.

Authentic Korean Saju methodology, AI-powered, in 20 languages. Not Western astrology pretending to be Eastern. Real Year/Month/Day/Hour pillars, Five Elements balance, Ten Gods, Daewoon (10-year luck cycles).

• Reading — https://hoonsikim.github.io/saju — Four Pillars chart + Five Elements + Ten Gods for any birth date/time
• Daily fortune — https://hoonsikim.github.io/saju/today.html — today's reading + 7-day forecast strip, surfaces the best day of the week
• Compatibility (궁합) — https://hoonsikim.github.io/saju/compat.html — two birth charts, a 0–100 verdict, shareable result card

All three run fully client-side. Enter a birth date/time, get a reading instantly. Every result is a shareable URL — open someone's link and their chart renders on your screen.

• 20 languages: English · 한국어 · 日本語 · 中文 · Español · Português · Français · Deutsch · Italiano · Русский · Türkçe · Nederlands · Polski · Svenska · Bahasa Indonesia · Filipino · Tiếng Việt · ไทย · हिन्दी · العربية
• Four Pillars engine: Year/Month/Day/Hour gan-ji, Five Elements ratio, Ten Gods auto-labeling — handles 立春 solar-term boundaries
• Compatibility: four-axis score (Day Master relation, Day Branch 六合/相沖, Five Elements complement, combined balance) → soulmate/strong/good/mixed/challenging verdict
• Shareable: URL-encoded birth state, native Web Share, downloadable verdict card (PNG)
• Pricing (planned): free basic reading → premium detailed reading / membership

Co-Star, The Pattern, Cafe Astrology — all Western astrology. The K-wave is global, but no modern Saju app exists outside Korea. ChatGPT can do it but with zero UX, no sharing, no consistency.

This fills that gap: authentic Korean Saju + modern UX + AI consistency + shareable results.

Matches Posteller (포스텔러 만세력 2.2) — Korea's #1 fortune app — 100% on the benchmark case (1990-12-20 16:30 KST → 庚午 / 戊子 / 己未 / 壬申). See test/saju.test.js.

Static frontend (GitHub Pages) + a Four Pillars engine in plain JS. Optional Cloudflare Worker calls the Claude API for narrative reading generation; without it the site falls back to a built-in rule-based reading, so it works with zero backend.

The Four Pillars engine — birthInfoToFourPillars, Five Elements balance, Ten Gods — is also published as a standalone, single-dependency Gist you can drop into any project:

https://gist.github.com/hoonsikim/03a5faced1f270edbd4ca8d580f2edb5

Handles 立春 solar-term and 子時 day boundaries the way Korean 만세력 does — the part most JS bazi libraries get wrong.

MIT for code. Reading methodology = public-domain Korean tradition.