Love Compatibility Report

Synastry · free compatibility score

See what the stars say about the two of you.

Enter two birthdays. We calculate both birth charts from real planetary positions, compare them aspect by aspect, and show you where you flow, where you spark and where you grow.

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Free score and signs · No account · About 2 minutes · Birth data stays in your browser

Real planetary positionsFree score and signsPrivate by designNo subscription

How it works

Two charts, one conversation.

  1. I

    Add both birthdays

    Names and birth dates for you and them. A birth time and place sharpen the Moon and unlock the rising sign, but they are optional.

  2. II

    We map both skies

    Sun, Moon, Mercury, Venus, Mars and the outer planets for each of you, calculated in your browser with an open source astronomy engine.

  3. III

    See how you meet

    Every major aspect between your charts is weighed by type and tightness into a score from 0 to 100, with romance, communication, emotional and long-term sub-scores.

Sample result

What you will see for free.

Your score, a band that describes the overall feel, four sub-scores, both people's key placements and the three aspects that shape you most.

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Honest pricing

The score is free. Always.

Free

  • Both birth charts, calculated precisely
  • Sun, Moon, Venus, Mars and rising signs
  • Compatibility score and four sub-scores
  • Your three most important aspects

Full report

  • Romance, communication, emotional and long-term chapters
  • Every aspect between you, explained and sorted by strength
  • Each placement read in a relationship context
  • Your element dynamic and tips for loving each other
  • Printable, save-as-PDF layout

Paid once. No subscription.

Private by design

Your birthdays stay with you.

Charts are calculated inside your browser. Names, birth dates, times and places are saved only on this device, so you can come back to them, and are never sent to our server or anyone else. If you buy the full report, Stripe handles the payment and we only receive a receipt that unlocks the written texts.

Free calculators

Just curious about one chart?

Questions

Is the compatibility score really free?

Yes. Both charts, your Sun, Moon, Venus, Mars and rising signs, the compatibility score, the four sub-scores and your top aspects are free. Only the full written report is paid, once.

What if I don't know a birth time?

Tick “I don't know”. We use noon, skip the rising sign, and tell you if the Moon may have been in a different sign that day. Most of the relationship planets barely move in a day.

Where does my birth data go?

Nowhere. The charts are calculated in your browser and saved only on this device. Our server never receives names, birth dates, times or places.

How is the score calculated?

We find every major aspect (conjunction, sextile, square, trine, opposition) between your personal planets and theirs, weigh each by type and how exact it is, and group them into romance, communication, emotional and long-term themes. The same birth data always gives the same score. Challenging aspects count as chemistry and growth, not doom.

Is this astrology accurate?

The planetary positions are astronomically accurate. What they mean for a relationship is a tradition of reflection, not science or prediction. Use it as a conversation starter, not as advice.

What does the full report include, and does one purchase cover other couples?

Chapters on romance, communication, emotional connection and long-term potential, every aspect between you explained, each placement in a relationship context, your element dynamic and tips for loving each other. One purchase unlocks full reports for any pair you enter on this device.

Two birthdays. One sky.

Compare our charts