The language of change.

A practice of attention

YAO brings Chinese symbolic traditions into an accessible space for reflection. BaZi offers a way to look at the calendar pattern of a birth. The I Ching offers a way to sit with a question and consider change.

These traditions are cultural and interpretive systems. They are not scientifically established ways to predict events or determine personality. A useful reading opens a question; it does not settle your future.

What you can do here

Explore a Birth Pattern, cast a real six-line I Ching reading, browse all 64 hexagrams, keep a personal journal, and preview a Personal Reading. The free tools remain complete without an account.

How the readings work

The I Ching uses the three-coin method: tails counts as 2, heads as 3. Six casts build six lines from bottom to top. Totals of 6 and 9 change into their opposite; 7 and 8 stay as they are.

Hexagram numbers follow the King Wen sequence. Each hexagram has original, modern English commentary written for YAO. Changing-line prompts consider the position of a line; they are reflection prompts, not translations of the ancient line texts. A relating hexagram is another perspective on the change, not a promised outcome.

Birth Pattern uses lunar-javascript 1.7.7 for calendar calculations and Temporal 0.5.1 for time zones. Solar-term comparisons use an absolute moment expressed in UTC+08; day and hour pillars default to recorded local civil time with a midnight boundary. Optional mean solar time, true solar time and a 23:00 boundary use an explicit method profile. A solar clock requires your confirmed longitude; the birthplace label does not supply coordinates. The selected zone resolves the physical instant, which remains unchanged for solar terms and luck onset.

Dates from 1901 onward are supported. Unknown hours are omitted. Pillars affected by an uncertain birth time or a solar-term boundary are marked Uncertain. The five-element display counts each visible stem and branch once; it is not a professional assessment of elemental strength or favorable elements. A second register expands Hidden Stems; Ten Gods relate each known stem to the Day Master. Luck Pillars use a declared traditional category and minute-based onset method.

How your information is handled

In the free Birth Pattern and limited preview, your birth information stays in this browser. Calculations and report selection run on your device. YAO does not send your birth details, questions or journal entries to an AI service, analytics tracker, advertising pixel, or payment provider.

An unsaved result uses this tab's temporary browser storage so it survives refresh. You choose whether to save it to the journal in localStorage. Your browser may restore temporary data when restoring a tab; saved entries remain until you delete them or clear the browser's site data. Export a copy if you want to keep it elsewhere. This is not cloud sync, and another person using your browser profile could open your journal.

The hosting provider receives ordinary website requests, including your IP address. Your personal reading is never put into a URL. Clearing the journal removes saved entries; use “Forget current reading” on a result page to remove its temporary copy.

Checking secure checkout availability… Our Privacy Policy distinguishes the current browser-local tools from verified paid delivery. Birth calculation remains in this browser; the server keeps a protected input fingerprint and necessary order records. Birth details will not be placed in payment notes or advertising analytics. Our delivery, refund and purchase terms are available below.

Made with care

The homepage photographs are original YAO visual assets. YAO's geometric identity keeps the approved 180-degree construction in a pure black presentation; the wordmark is unchanged.

Open-source acknowledgments: software licenses. Learn more about the calendar library and three-coin tradition.

YAO V0.3.0 · Reflection, not a substitute for informed professional advice.