Emotional tone
How feelings are expressed, supported, and regulated between you.
Astrology compatibility
Synastry Chart & Astrology Compatibility Calculator
Calculate your free synastry chart online. Compare two birth charts at a glance and ask the AI to interpret emotional, mental, and long-term chemistry.
The more accurate the birth time and place, the deeper and more reliable the compatibility analysis.
Instant overview of harmony, tension, and growth points.
AI reads birth data, not just Sun signs.
Add a clarifying question for focused guidance.
Compatibility map
Click a zodiac sign to see compatibility lines.
ResonanceChallengesGrowth
This is only a preliminary compatibility check that compares signs on the surface. For accurate compatibility, you need synastry — the astrological method of relationship analysis.
What the analysis covers
Communication rhythm
Where you align in thinking style and how to soften misunderstandings.
Long-term potential
Shared goals, tension points, and the kind of partnership that can grow.
Compatibility Score
A precise mathematical calculation of relationship potential based on planetary aspects.
Synastry and deeper compatibility
Synastry is an astrological method of compatibility analysis that compares two natal charts. Using a synastry chart calculator, you can reveal deep planetary interactions between partners.
Unlike a simple horoscope or a Sun-sign compatibility table, birth chart synastry considers:
- how one partner's planets aspect the other's;
- interactions of personal factors (Sun, Moon, Venus, Mars);
- the influence of houses and angular points in each chart;
- areas of harmony and potential conflict.
It is a serious tool for understanding relationship dynamics, emotional closeness, communication, and a couple's potential.
Many services show only basic zodiac indicators — for example, how compatible your Suns or elements are. Such tables give a general impression but ignore the deeper factors that shape real interaction.
A proper synastry reading provides a much more accurate analysis because it considers:
- the actual positions of the planets at each person's birth;
- the exact mathematical aspects between your charts;
- how you connect emotionally, intellectually, and physically.
While a basic zodiac check gives a rough orientation, generating a free synastry report provides a much deeper look into your relationship. A detailed analysis offers:
- a full breakdown of strong and weak astrological aspects;
- answers about communication, emotional compatibility, passion, and life goals;
- clarity on which specific planets bring you together;
- recommendations on how to use your strengths as a couple.
Deep synastry is not just a compatibility percentage, but a psychological portrait of the relationship and clarity on where you align naturally and where conscious effort is needed for harmony.
When you calculate synastry compatibility with our tool, you will receive:
- a compatibility rating by key planets and aspects;
- practical recommendations to improve your interaction;
- insights into both the emotional and practical sides of the relationship;
- an honest characterization of your couple based on real astrological data.
Birth details for both people
Enter the date, time, and place of birth for each person to generate a reading.
AI compatibility becomes more detailed when birth time and place are known for both people.
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Depth options
Enable extra analysis modules. Each option adds +1 request.
Explore Synastry Sections
Move from a quick compatibility overview to focused reading formats: aspects, house overlays, and planetary roles.
Aspects
Read the strongest inter-planet contacts between two charts and how they influence chemistry.
Houses
See where your partner activates your life areas: identity, home, partnership, and intimacy.
Planets
Understand each planet’s role in compatibility: attraction style, emotional needs, and long-term dynamics.