Compatibility · Synastry
See how two charts click
Not sun-sign matching: full synastry between two real birth charts. Six life spheres scored 1 to 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
Identity
How your identities meet: autonomy, respect, personal style.
Love
Attraction, tenderness, emotional trust and how it repairs.
Body
Energy levels, pace, physical rhythm and drive.
Money
Money, work, practical decisions: friction or traction.
Home
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 positions for both charts; the five major aspects between them, each with its orb, and the house overlays.
- 3
Deterministic scores
Six spheres scored 1 to 10 from harmony- and orb-weighted aspect math. No AI numbers.
- 4
Grounded reading
The reading explains the strongest and weakest spheres and names 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 calculates synastry between two complete birth charts: the five major aspects between their bodies (Moon to Venus, Mars to Saturn and so on), with orbs of 6° and 4°, and the house overlays. Two Leos can score 3/10 or 9/10 depending on everything else.
What do the six sphere scores mean?＋
Identity (identity and autonomy), Love (attraction and emotional flow), Body (energy and physical rhythm), Money (money, work, practical life), Home (home and belonging), Mind (communication and ideas). Each is scored 1 to 10 from the real cross-aspects that touch that sphere's planets.
Are the scores generated by AI?＋
No, and that is 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.
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