Hi Product Hunt — I built ioreum because every "AI fortune-telling" app I tried got the prose right and the calendar wrong. A Korean saju chart is a calendar function: sexagenary counting, the 24 solar terms as astronomical instants, true solar time for your birthplace. Chatbots guess at it. So ioreum splits the job: a deterministic TypeScript engine computes the chart (golden-tested at every boundary — the ipchun morning, the 11 pm hour, births abroad), and an LLM only writes the reading. It isn't allowed to change a number. Free, no account: the full chart calculator, all sixty day pillars, and a 30-second "which of the 60 characters are you" quiz. Paid: the written reading — one-time credits from $4.99, no subscription, refundable within 14 days if unused. Two things I'm proud of: • The calendar engine is open source: npx k-saju 1995-03-16 07:30 (MIT, on GitHub). • It's also a remote MCP server — paste https://www.ioreum.com/api/mcp into Claude or ChatGPT as a custom connector and ask for your chart there. Honest caveat: the interpretation is a tradition, not a science. The calculation is the part we can verify, so that's the part we made verifiable. Ask me anything about the boundary cases — they're the whole story.

ioreum

K-Saju birth-chart readings — computed, not vibes

K-Saju birth-chart readings — computed, not vibes