Synastry compares two birth charts to explore emotional patterns, communication styles, shared strengths, and the places that invite care. It is perspective — not a verdict on a relationship.
Free, before any account: Your compatibility score and aspect count, calculated from real ephemeris data, with no account.
What you get
A real relationship score from both complete birth charts
Planet-to-planet aspects between the two people
Works for partners, friends, family and colleagues
Talk the result through with an expert instead of buying the report
One-time report $2.99, or included with Astral membership at $19.99 per month.
Questions
Is the synastry calculator free?
Yes. Entering two birth charts and seeing your compatibility score, aspect count and a preview of the strongest aspects costs nothing and needs no account. The full written interpretation is the paid part.
Do I need to create an account to see my compatibility score?
No. The score is calculated and shown before you are asked for anything. An account saves the result so you can come back to it — it does not unlock it.
What does the synastry score mean?
It is derived from the classical relationship-score weighting: the destiny sign, Sun and Moon contacts, and the major cross-chart aspects between the two charts. A higher score means more strong contacts between the two charts, not a better relationship.
What do I need to calculate synastry?
The birth date, birth time and birth place for both people. The birth time matters — without it the Moon and the house placements cannot be positioned accurately.
The service combines astronomical ephemeris calculations with conversational audio experiences. It is designed to offer personalized, privacy-conscious astrology tools and does not use private consultation content as public model-training material.