Two charts overlaid
where they pull, where they chafe
The compatibility chart (also called synastry) overlays your chart and your partner’s, and shows where your energies attract, complement — or rub against each other. Free, with an interpretation for every link.
Time of birth is optional — without it Sun, Moon and Venus positions are slightly less precise.
Your connection, in four layers
Emotional compatibility
How do your Moons meet? How do your Venuses fit? The emotional layer is usually what carries a connection — or exhausts it.
Mental compatibility
Mercury to Mercury, Ascendants in contact — how you think, speak, argue. Where your thoughts meet, and where you talk past each other.
Attraction and tension
Which aspects between your Mars, Venus, Sun and Moon positions create attraction, which create friction? Both are part of any alive relationship.
Long-term composition
What happens when the slow planets meet? Saturn and Jupiter between your charts show whether the connection has depth and stamina.
Three steps to a compatibility chart
Enter both birth data sets
Date, time and place for you and your partner. The more precise the times, the more detailed the read — especially for Ascendants and houses.
Compute the synastry
We overlay both charts and calculate every aspect between your planets. The result: a map of the energetic touch-points between you.
Read your connection
Every aspect gets a clear interpretation — what it typically creates between two people, where your strengths are, what you can work on.
More astrology tools
Birth chart
Your own chart as the foundation for synastry.
Daily transits
What today’s sky is saying about your connection.
Solar return
Your own astrology year, starting on your birthday.
Astrology events
Eclipses, ingresses, retrogrades — on the calendar.
All instruments
The astrology hub with all five tools.
Learn astrology & tarot
Read synastry and tarot yourself in 30 days, step by step.
Compatibility — frequently asked questions
- What is synastry, exactly?
- Synastry is the astrological method of overlaying two birth charts and looking at the aspects between the planets of both people. It shows where two energies resonate with each other.
- Does the compatibility chart tell me whether we fit?
- Not in a yes-no sense. It shows where your connection lives, where it needs work, and which themes typically come up between you. Whether you fit is decided by your shared story — the chart hands you the map.
- Does this work for friendships or family too?
- Yes. Synastry works for any relationship between two people — romantic partners, best friends, siblings, parent and child. The aspects are the same; what you read out of them differs.
- Do I need my partner’s exact birth time?
- For the most important aspects (Sun, Moon, Venus, Mars), date and place are enough. For a full analysis with Ascendant and house links, the time matters.
Ready to overlay your charts?
Two charts, every aspect, a complete synastry — free, with an interpretation for every link.
Start the compatibility chartFree, no sign-up.