Hey Product Hunt 👋

Cheonmyeongdang is a Korean Saju (사주, four pillars of destiny) AI that draws your birth chart and reads it in 9 languages — English, Japanese, Chinese, Korean, Spanish, Portuguese, Indonesian, Vietnamese, and Hindi.

I'm a solo founder (Korea, 1-person company). Built this because every astrology app out there is Western. Saju is 4,000 years old and nobody outside Korea/China can use it without learning Korean. So I wired Solar→Lunar calendar conversion, true solar time, 24 jieqi solar terms, the whole stack, plus a GPT-style AI consultant on top.

What's free:

- Birth chart drawing (10 pillars, hidden stems, all of it)

- Compatibility (궁합) preview

- Daily fortune

What's paid:

- Daily pass ₩1,500 (≈$1) — unlimited AI consult for 24h

- Monthly ₩29,900 (≈$22)

- Annual ₩287,040 (≈$211, ~20% off)

Currently live in web (sajuapp.app) + Android (Play Store), iOS in review.

One thing I'd love feedback on: the AI consultant tone. I made it conversational on purpose because traditional Saju readings are dense and intimidating. Did it land for non-Korean users? Anything confusing?

Thanks for checking it out 🙏 happy to answer anything.

— Hongdeokhun (홍덕훈), Founder