星読みAI (Hoshiyomi AI) is a Japanese-language astrology service built around the natal chart. You enter a nickname, date of birth, time of birth and birth city, and it produces a horoscope birth chart reading; alongside it sit compatibility readings between two charts and a dedicated north node (ドラゴンヘッド) reading, plus explanatory articles on the houses and on chart interpretation generally.
As a piece of software it is well matched to its subject. Chart interpretation is a rule-bound synthesis – positions and aspects combining into prose – which is exactly the kind of structured-to-narrative task language models handle fluently, and doing it natively in Japanese rather than as a translation layer over an English product is a real distinction in this category. Asking for the birth city rather than the country alone is the mark of someone who knows the chart depends on it.
Two things to be clear about. Astrology has no demonstrated predictive validity, and readers who want that stated plainly should have it stated plainly – though most people using a natal chart tool are after reflection and framing rather than forecasting, and on those terms it does what it says. The second point is practical and applies whatever you think of the first: your full name, exact date of birth, time and place is the precise tuple used as a knowledge-based identity check by banks and government services, and it is being handed to a small vendor. A nickname is accepted, and using one is sensible. Terms, privacy policy and rates are all published.
