Compatibility by birth date
Compare two birth charts: where you understand each other easily, and where you can learn from each other.
- More than "are our star signs compatible?": Sun, Moon, Venus and Mars show how each of you handles closeness, affection and disagreement.
- Instant and free: a light-hearted score with sub-scores and the aspects between your two charts.
- Works without the other person's birth time too. A full compatibility reading (AI, a one-time €9.99) is optional.
How does astrological compatibility work?
Astrological compatibility, known as synastry, lays two birth charts on top of each other. It shows which planets in one chart connect with planets in the other, such as Venus and Mars for attraction or the two Moons for emotional closeness.
From those aspects we calculate a light-hearted overall score with sub-scores. The details are usually more interesting than the number: where the two of you complement each other and where you work differently.
A compatibility reading cannot predict whether a relationship will last. It can be a good excuse to talk about needs and differences.
Free calculators
Questions
How is the compatibility score worked out?
We compare the positions in both charts and look at the angles between them, for example between your Venus and the other person's Mars. That gives an overall score and a few sub-scores. Take it with a smile: it is a conversation starter, not a verdict on your relationship.
What if I don't know the other person's birth time?
No problem. The Sun, Venus, Mars and usually the Moon can be calculated from the date alone. Without a time, only the rising sign and houses are missing, and we say so in the result.
Is the comparison free?
Yes. The score, sub-scores and aspects show up straight away, with no email needed. If you like, you can then buy a full compatibility reading: written by AI, a one-time €9.99, not a subscription, refundable on request within 14 days.
How accurate is it?
We compute positions with astronomical formulas, accurate to a fraction of a degree, using the tropical zodiac and Placidus houses (whole-sign houses at polar latitudes). The interpretation is astrology: a symbolic system for reflecting on yourself, not science and not a prediction. Keep what helps and leave the rest.
What happens to both people's data?
For the free comparison, birth details are processed on our servers in the EU for that one calculation and are not stored. They are never sent to ad networks or tracking pixels. Please only enter another person's details with their permission.
Astrology is for entertainment and self-reflection and does not replace medical, legal, financial or psychological advice.