Free browser tools
Four free tools for the I Ching, Bazi, Zi Wei Dou Shu and astrology.
All four run in your browser with no account, no login, no email and no ads. Cast an I Ching hexagram, build a Four Pillars chart, lay out a twelve-palace Zi Wei Dou Shu chart, or draw a Western birth chart — and read a complete course alongside each one. Charts and notes stay in your own browser and are never uploaded.
See the four tools ↓The four tools
YiJian — I Ching casting and all 64 hexagrams
Throw three coins six times, or type in six numbers you cast yourself. The tool draws the primary hexagram, marks the changing lines and derives the resulting hexagram, then tells you which passage to read as the main text, following Zhu Xi's rules from Yixue Qimeng. All 64 hexagrams are available in full with line-by-line readings, plus eight beginner lessons starting from what a yin and a yang line are.
The eight beginner lessons and all 64 hexagram pages are available in English. The casting tool is Traditional Chinese only for now.
Open YiJian · Cast a hexagram now · Browse all 64 hexagrams · Read the eight lessons in English
Shilai Bazi — Four Pillars chart and 20 lessons
Enter a birth date, time and city and the chart is calculated for you: year, month, day and hour pillar, each with a heavenly stem and an earthly branch. The 20 lessons start by finding your Day Master, then work outward through the Five Phases, the Ten Gods, hidden stems, combinations and clashes, in plain language rather than jargon. If you do not know your birth hour, leave it blank — the other three pillars still read normally.
Every lesson has an English version.
Open Shilai Bazi · Start lesson 1 in English
Shilai Ziwei — Zi Wei Dou Shu chart and 36 lessons
A twelve-palace chart with the main stars placed, the opposite palace, the three-and-four alignment, the ten-year and yearly layers. The 36 lessons label every passage as classical source text, plain restatement, or this project's own wording, and classical lines are quoted only from Ziwei Doushu Quanshu volumes one to three. Where a reading genuinely has two accepted methods — an empty palace, for instance — both are shown rather than one being chosen for you.
Every lesson has an English version.
Open Shilai Ziwei · Start lesson 1 in English
Shilai Astrology — Western birth chart and 36 lessons
A Placidus birth chart with today's sky and the transit that triggers it. Without a birth time it shows only what is certain and leaves the Ascendant and the houses blank, instead of filling them with a guess. The 36 lessons cover what a chart is, Sun, Moon and Ascendant, the modalities and elements, the twelve houses and the aspects.
Every lesson has an English version.
Common questions
Do I need an account?
No. There is no sign-up, no login and no email address. Charts, casts and notes are stored only in your own browser; clearing your browser data clears them, and nothing is synced to another device.
Are they really free, and are there ads?
Yes, free, with no ads and no paywalled lessons on the web versions. Every lesson and all 64 hexagrams are open to read.
Which parts are in English?
The Bazi, Zi Wei Dou Shu and astrology lessons all have an English version. The eight I Ching beginner lessons and all 64 hexagram pages are in English too. The I Ching casting tool is Traditional Chinese only for now.
What if I do not know my birth time?
Leave it blank rather than guessing. A guessed hour produces a plausible-looking chart built on a false value, which is worse than a chart with one part missing.
Do these tools predict the future?
No. They are learning and reflection tools. The lessons keep what the chart factually shows separate from the classical source text and from interpretation, and places where no conclusion can be drawn are marked as such.
Is there a machine-readable index?
Yes. llms.txt lists every tool, lesson and hexagram page with a short description, for AI assistants and search engines.