Stars runs a pair through 18 compatibility systems — Western synastry, Vedic Ashtakoot, attachment dynamics, HD connection types, numerology — and reports where they agree, where they don't, and how independent those agreements actually are. No single "percent match."
Ten dimensions, each scored from the systems that speak to it, each labelled with how much of the agreement is genuinely independent.
Illustrative. Both charts computed from one ephemeris pass; the lineage count tells you whether agreement is convergence or inheritance.
the whole engine, behind every category
93 traditional D0–D2 systems converge at cosine 0.515–0.523 across 500 charts (511 comparable pairs), engine hypotheses excluded. Engine 2.7.0. Verified 2026-09-08.
Inter-aspects, house overlays, midpoint and Davison composites, Sun/Moon midpoint, vertex and node contacts, Gauquelin angularity resonance.
The 36-point Guna Milan match — varna, vashya, tara, yoni, graha maitri, gana, bhakoot, nadi — plus mangalik assessment, each koota shown.
Attachment-style dynamics (analogue to ECR-R), desire-architecture fit, love-language match, Gottman relational markers.
Which channels one design completes for the other, electromagnetic and dominance connections, companionship and compromise channels.
Karmic alignment scoring, node contacts, Tarnas archetypal combinations, maturity and relationship readiness.
Most compatibility tools stop at the dyad. Stars runs the full pairwise matrix plus a multi-composite midpoint chart and group-field dynamics for any constellation — polyamorous configurations, blended families, a founding team, a household. Every pair scored, plus the shape of the whole.
The easy move is to average everything into one "percent match." That number would be wrong, because two kinds of independence are in play and they measure different things.
We never collapse corroboration to one number. Measurement independence asks how many distinct observables agree; transmission independence asks how many uninfluenced lineages arrived there. Ten systems reading one ecliptic longitude are one measurement, not ten — and we render both axes.
So each dimension carries both a score and a lineage count. Ten systems reading one Sun–Moon aspect are one measurement, not ten. Two traditions with no documented contact that both flag the same friction are genuine corroboration. We render both and never collapse them.
Stars computes the overlays and the agreement. Whether two people should be together is not a computation — that is your judgement, or theirs. Founding matchmakers and couples coaches get a permanent free account for telling us what the scorecard gets right and wrong.
Invite-only beta. A pair endpoint is available for dating and compatibility products.
Explorer $0/mo · Enthusiast $12/mo · Practitioner $59/mo · Studio $199/mo — the free tier covers chart computation and exploration; paid tiers add narratives, client management, and batch tools.