Astrool Compatibility
Sun-sign matching is a rough first pass. Real astrological compatibility compares entire charts, and frequently disagrees with the chart-free version.
The quick version: elements
Signs sharing an element generally understand each other's default mode without explanation. Signs in compatible elements complement each other. This is the layer most compatibility articles stop at.
| Element | Signs | Naturally easy with |
|---|---|---|
| Fire | Aries, Leo, Sagittarius | Fire and Air |
| Earth | Taurus, Virgo, Capricorn | Earth and Water |
| Air | Gemini, Libra, Aquarius | Air and Fire |
| Water | Cancer, Scorpio, Pisces | Water and Earth |
Opposites
Each sign has an opposite across the zodiac: Aries and Libra, Taurus and Scorpio, and so on. These pairings are not incompatible; they are the classic attraction. Each holds what the other underdeveloped, which is magnetic at first and the source of the argument later.
Synastry: comparing full charts
Synastry overlays two birth charts and reads the aspects between them, comparing sun, moon, Venus, Mars and the other placements rather than a single sign each. It is where compatibility becomes specific rather than statistical, and it is why two people whose sun signs "should not work" often do.
Astrool's compatibility reading currently works from your sun sign, the fastest and most reliable comparison to run without both people's exact birth times. Adding a birth time to both profiles is what the app uses to sharpen a reading; full multi-planet synastry across moon, Venus, Mars and the angles is on the roadmap.
What compatibility does not tell you
An easy chart comparison does not make a relationship good, and a difficult one does not doom it. Synastry describes the terrain: where things flow, where they catch. What people do with that is not in the chart.
Get your Compatibility horoscope
Astrool calculates your full birth chart, not just your sun sign, and writes your daily, weekly and monthly readings against it.
Common questions
Does Astrool compare full birth charts?
Astrool's compatibility reading currently compares sun signs. Full multi-planet synastry, matching moon, Venus, Mars and the angles between two complete charts, is planned.
Are some pairings simply bad?
No. Some are more work. High-friction combinations are common in long marriages, because friction and engagement are not opposites.
Can I check compatibility with a friend?
Yes. Sign-based compatibility works for friendships, family and business partners too, the comparison is simply read for a different kind of relationship.