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LIVE on Product Hunt — May 15, 2026 Hello Hunters! Welcome to Cheonmyeongdang. Upvote on Product Hunt →
天命堂
CHEONMYEONGDANG · KOREAN SAJU · SINCE 2026

AI Saju that actually understands Korean astrology.

Western birth charts treat you as a sun sign. Korean Saju (Four Pillars of Destiny) reads four heavenly stems and earthly branches — and we taught an AI to explain what they mean for your career, love, and 2026 in plain English.

No signup required 4 languages (KO / EN / JA / ZH) 24h refund PayPal · Apple Pay · Cards

30-second demo — coming soon.
For now: try the live calculator (no signup, takes 20 seconds).

How it works

Three steps. Twenty seconds. Then an AI you can actually talk to.

1

Enter your birth date & time

Solar or lunar calendar, true solar time correction, timezone-aware. The same precision a Seoul Saju master would ask for — automated.

2

Get your four pillars instantly

Year · Month · Day · Hour pillars with the ten heavenly stems & twelve earthly branches. Visualized as a 4-pillar chart, the five elements wheel, and a 10-year fortune curve.

3

Ask the AI anything

"Should I quit my job in Q3?" "Is my Aug-1992 partner compatible?" The AI cross-references your chart with 1,000 years of Korean classical commentary — and answers in plain English.

★ Product Hunt Community Special ★

50% OFF Annual — for Hunters only

$99.99$49.99/year
≈ ₩29,700/year · One year of unlimited AI Saju questions, premium reports, and 2026 monthly forecasts.
⏳ Offer expires in 24:00:00

The 50% Annual price ($49.99 vs $99.99 monthly-equivalent) is already live on our membership page — no coupon code needed. Click the button above to checkout via PayPal in 30 seconds.

What you get on day one

Free forever. Premium unlocks deeper analysis.

4-Pillar birth chart

Stems, branches, hidden stems, ten-gods, all annotated.

5 elements visualizer

See where you're heavy or empty — and what to balance.

10-year fortune (大運)

Curve showing when your luck peaks and when to lay low.

2026 Year of the Red Horse

Month-by-month forecast for the 12 zodiac animals.

Compatibility tool

Match yourself with a partner, child, or business cofounder.

AI Q&A chat (Premium)

Ask anything about your chart — career, love, money, timing.

FAQ

For Hunters who like to know before they click.

How is this different from a Western birth chart?

Western astrology reads sun, moon, ascendant — three points. Korean Saju reads four pillars (year/month/day/hour), each with a heavenly stem + earthly branch = 8 characters total. That's why it's called palja (八字, "eight characters"). It tracks luck in 10-year cycles, not Mercury retrogrades.

Is the AI just GPT with a prompt?

No. We built a Saju calculation engine first (true solar time, lunar conversion, sip-sin, twelve operators), then fine-tuned the LLM on Korean classical Saju texts. The AI never invents pillars — it reads what the engine produced and explains it.

Why $49.99/year on Product Hunt day?

Our normal annual price is already 50% off the monthly equivalent ($7.99 × 12 = $95.88). For PH community, we keep that price live for 24 hours so you don't need a coupon code — just click and checkout.

Is my birth data private?

Yes. Birth date/time stays on your device for the free reading. Premium reports are tied to your email only, never shared, and you can request deletion any time via our privacy page.

Refund policy?

24-hour no-questions refund on all paid plans. Just email us — we wire it back via PayPal within 1 business day.

D

Deokhoon Hong — Maker

Founder, KunStudio · Seoul, Korea

Hello Hunters! Building Cheonmyeongdang has been a year-long obsession. I grew up watching my grandmother visit Saju masters every Lunar New Year — and I always wondered why nobody had translated that 1,000-year-old wisdom into something I could read on my phone, in English, at 2 AM.

The hardest part wasn't the AI — it was getting the calculation engine right. True solar time, lunar conversion, hour pillar correction for daylight saving... Western chart calculators don't need any of this. Korean Saju does. We rebuilt all of it.

Today's launch is special because it lines up with a personal milestone: our music label (Sori Atlas) releases its 6th track on May 15 too — a little side project that keeps me honest about creative work. Thank you for hunting with us.

— Reply on Product Hunt or DM @kunstudio on X.