Astrology Compatibility Calculator
Two birth charts, one real synastry score — not a Sun-sign lookup.
Astrology entertainment. Both charts are computed in memory and discarded — nothing is stored.
Check two people's compatibility
You
Them
What "synastry" actually measures
Synastry is the branch of astrology that compares two complete birth charts. Instead of asking "are these two Sun signs compatible?", it looks at the real angular relationships between one person's planets and the other's — Venus to Mars for attraction, Moon contacts for emotional safety, Saturn for commitment, and so on. Soulstral computes both charts from actual astronomy and scores around sixty of these contacts, weighted by how exact each one is. That's why the result changes with the real birth data, not just the star sign.
The five dimensions
- Chemistry — attraction and spark.
- Emotional bond — feeling safe and understood.
- Communication — how easily conversation flows.
- Stability — the long-term glue.
- Destiny — the "meant to be" factor.
A birth time makes the reading sharper (it adds the Rising sign and precise Moon), but the calculator still works without it. Read the full methodology for exactly how the scoring works.
Frequently asked questions
How is this compatibility calculator different from a zodiac one?
It doesn't reduce you to Sun signs. It computes both full birth charts and scores the real angular contacts between them — the same synastry professional astrologers read.
Do we both need our exact birth times?
No. A birth time sharpens the reading (it adds the Rising sign and Moon precision), but you can leave either time blank and still get a meaningful score from the rest of the chart.
What does the compatibility percentage mean?
It's a harmony index: the share of your significant planetary contacts that are supportive versus frictional. Every real relationship has both — the breakdown shows you where.
Is my data saved?
No. Both charts are computed in memory and discarded immediately — no accounts, no storage.
Don't have a specific person in mind? Use the soulmate birth date calculator to find the birth dates that best fit your chart.