RELATIONSHIP ASTROLOGY

Birth chart compatibility.

Compare two birth charts for a detailed report on attraction, communication, and emotional compatibility.

Planetary aspects.
House overlays.
ENTER YOUR BIRTH DETAILS

Compare your charts

Love compatibility
YouYour birth details

The local time where you were born.

PartnerTheir birth details

The local time where they were born.

Chart preferences Optional

Choose whole-sign or equal houses. The reading uses tropical planetary positions and five major aspects.

Your birth details and reading are calculated in this browser.

City searches use Open-Meteo / GeoNames. Names and birth dates are not sent.

WHAT THE REPORT COVERS12 relationship topics, with chart interpretations.

Emotional connection

Emotional needs, habits, and how each person gives and receives support.

Attraction & chemistry

Venus and Mars aspects, desire, affection, and differences in pace.

Communication

Thinking styles, misunderstandings, and how you handle disagreements.

THE COMPLETE DECK

78 little worlds.

The original illustrations by Pamela Colman Smith. Every card is part of your draw.

HOW THE REPORT WORKS

About synastry

Synastry compares two birth charts. It examines planetary aspects and house overlays to interpret attraction, communication, emotional needs, and other relationship themes.

  1. 01

    Enter birth details

    Add a birth date, local birth time, and birthplace for each person.

  2. 02

    Compare the charts

    We calculate planetary positions and compare the angles between your charts. Each interpretation names the aspect behind it.

  3. 03

    Read your report

    View interpretations by topic, review the chart details, and download the full report as a PDF.

Planetary positions are calculated with Astronomy Engine. Interpretations use original rules based on traditional astrology. Astrology is not a scientifically validated predictor of relationship compatibility. Read our calculation method and sources.