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Astrology Compatibility

Calculate your true synastry compatibility. Uses exact planetary degrees, houses, and aspects for a $50 premium astrology reading for free.

Premium Synastry Engine: Calculates exact planetary degrees and elements for a full, detailed report.

Person A

Person B

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About This Tool

Most zodiac compatibility tools just compare your sun signs and call it a day. This one runs a real synastry engine: it calculates the actual astronomical positions of five planets — Sun, Moon, Mercury, Venus, and Mars — for both people on their birth dates, then measures the geometric angles between them.

Those angles (aspects, in astrology language) tell the story. A Trine means effortless flow. A Square means friction that sparks growth. A Conjunction means two energies fused into one. You'll see your eight strongest aspects, each with a plain-English interpretation of what it means for your relationship.

The result is a full report: an overall match percentage, three separate scores for Emotional Bond, Physical Chemistry, and Mental Sync, a relationship persona like The Sparkplugs or The Builders based on your elemental mix, and the breakdown behind every number.

Download the whole report as a polished PDF, or copy a share text for your partner. Free, instant, no signup — and refreshingly clear that it's for fun and reflection.

How to Use

  1. 1Enter both people's names and exact birth dates — precision matters, the math uses real planetary positions
  2. 2Press Calculate Compatibility and give the engine a moment to scan the cosmos
  3. 3Read your Relationship Persona — a title like The Sparkplugs, The Builders, or The Volatile Lovers based on your combined elements
  4. 4Check your Overall Match ring, then the three sub-scores: Emotional Bond, Physical Chemistry, and Mental Sync
  5. 5Scroll through your eight strongest planetary aspects, each color-coded: green for harmonious, red for tense, purple for intense
  6. 6Tap Download PDF to save the complete report, or Copy Share Text for messaging
  7. 7Press Test Another to compare a different pair

Frequently Asked Questions

Sun-sign tests compare only your birth month. This engine calculates the actual astronomical longitudes of five planets for both people and measures the angles between them — the same synastry approach astrologers use, minus the wait and the fee.

Green aspects (Trine, Sextile) are harmonious — energy flows naturally. Red aspects (Square, Opposition) are tense — they create friction but also growth. Purple Conjunctions are intense fusions of energy.

A title assigned from the elemental mix of your sun signs — like The Sparkplugs (Fire + Air), The Builders (Earth + Water), or The Volatile Lovers (Fire + Water). It captures the overall flavor of your dynamic.

Because compatibility isn't one number. Emotional Bond draws from your Moon positions, Physical Chemistry from Venus and Mars, and Mental Sync from Mercury — three genuinely different dimensions of a relationship.

No — just the birth dates. The engine works from planetary positions that shift slowly enough for date-only accuracy.

Astrology is a belief system, not a science — this tool is for entertainment and reflection. The astronomy behind the planet positions is real; the interpretation is tradition and fun.

Yes — download it as a styled PDF with one click, or copy a share-ready text.

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