02 / The difference
Anyone can print the Four Pillars.
The determinations are what separate these tools.
Most open-source BaZi skills return the Four Pillars and the Ten Gods. Ask what your Useful Element is and the assistant has to invent an answer. Destiny Book has the engine make that call, then lets your AI explain it.
What comes backFour-Pillars-only projectsDestiny Book CLI
Four Pillars, hidden stems, Ten GodsYesYes, with element weights
Day Master strengthNo evidenceSupport from season, root and allies, listed one by one
Useful, Favorable, UnfavorableLeft to the assistantReturned by the engine
Seasonal balanceUsually missingRegulating stems with a rating
Wealth stars, vault, capacityUsually missingVault opening condition and carrying capacity
Career palace, benefactors, ShenshaUsually missingPosition with its supporting evidence
Time basisNot statedTrue solar or clock time, stated explicitly; ambiguity fails loudly
LanguagesUsually Chinese onlyFive languages, same facts and same digest
The gap is not whether the Four Pillars are computed correctly. It is who makes the calls on the Useful Element, the favorable and unfavorable elements and the strength evidence. The engine returns the determination with its basis, and the AI explains it. Neither one pretends to be the other.