Archive of the Human Design System The Science of Differentiation

Research · Open Study

The Differentiation Study — Chart Consistency

A reliability check. If Human Design measures something real, the same birth data should produce the same chart no matter which calculator you use. Readers report that it sometimes doesn't. Enter your birth data into two different free calculators, tell us what each returned, and watch the live agreement rate build. (Part of the study series — see the Type and Profile tests; method and pre-registration on the validation record.)

Method & pre-registration

Hypothesis (pre-registered): if the system is well-defined, the reported Type and Profile will agree across two independent calculators in essentially all cases (near 100%). Agreement materially below that indicates the basic input is not yet defined precisely enough to test the same way twice.

Design: each participant enters identical birth data (date, exact time, place) into two different free calculators and reports the Type and Profile each returned. The site records whether the two agreed on Type and on Profile.

A known confound, stated plainly: disagreement can come from the calculators themselves (different ephemeris data, rounding, or time-zone/DST handling) or from how the birth time and place were entered. Both bear on whether the system yields a single, well-defined output; the archive reports the agreement rate and draws no verdict about the cause.

Data & privacy: your birth data is not collected or stored — only which two calculators you used and whether the results matched. Aggregate only, live, below.

Step 1 — Pick two calculators

Choose two different free Human Design calculators you'll use for the same birth data.

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