Compatibility · Synastry
See how two charts click
Not sun-sign matching — full synastry between two real birth charts. Six life spheres scored 1–10 from the actual cross-aspects, and an AI reading that cites them.
Your own chart is free — compatibility runs on your saved chart plus their birth data.
Six spheres, scored from real aspects
Self
How your identities meet — autonomy, respect, personal style.
Heart
Attraction, tenderness, emotional trust and how it repairs.
Body
Energy levels, pace, physical rhythm and drive.
Matter
Money, work, practical decisions — friction or traction.
Roots
Home, family patterns, sense of belonging together.
Mind
Conversation, humor, ideas — do you actually hear each other.
How it works
- 1
Two real charts
Your saved chart + their birth data (or a private invite they fill in themselves).
- 2
Full synastry
Swiss Ephemeris computes every cross-aspect between the two charts with exact orbs.
- 3
Deterministic scores
Six spheres scored 1–10 from harmony- and orb-weighted aspect math. No AI numbers.
- 4
Grounded reading
The AI explains the strongest and weakest spheres — citing the aspects behind them.
Compatibility FAQ
How is this different from sun-sign compatibility?＋
Sun-sign matchers compare 2 of the ~20 factors that matter. NatalChart.AI computes full synastry: every cross-aspect between two complete birth charts — Moon to Venus, Mars to Saturn, all of it — with exact orbs. Two Leos can score 3/10 or 9/10 depending on everything else.
What do the six sphere scores mean?＋
Self (identity and autonomy), Heart (attraction and emotional flow), Body (energy and physical rhythm), Matter (money, work, practical life), Roots (home and belonging), Mind (communication and ideas). Each is scored 1–10 from the real cross-aspects that touch that sphere's planets.
Are the scores generated by AI?＋
No — and that's the point. The scores come from deterministic math over the computed aspects (harmony-weighted, orb-weighted, mapped through a calibrated curve). The AI only writes the explanation of numbers that already exist. Same two charts, same scores, every time.
Do I need the other person's exact birth time?＋
The more exact, the better — but a chart with noon fallback still yields reliable planet-to-planet aspects. Time mostly affects their Ascendant and houses.
Does the other person have to sign up?＋
No. You can enter their birth data yourself and get the reading immediately. If you'd rather not guess their details, send them a private invite link — they fill in their own data and you both see the result.
Is it only for romance?＋
No. Synastry is mode-agnostic — the same two charts produce the same energies whether you're partners, friends, cofounders, or family. The reading describes how the two of you meet, communicate and resolve friction; you apply the context.
Two real charts. One honest answer.
Build your free chart first — compatibility takes one more minute.
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