Zodiac compatibility looks at how two Sun signs tend to interact, based on their element, modality and the angle between them. TarotDew has a page for every one of the 78 sign pairs, including each sign with itself. Choose two signs above to read it. It is free, needs no sign-up and has no ads.
Example reading
Input: Aries and Libra
Result: Opposite signs, six signs apart. Aries brings drive and directness, Libra brings tact and a love of partnership. The pull between them is strong because each has what the other lacks, and the friction shows up around decisions: Aries wants to act now, Libra wants to weigh it up. They do best when they treat the difference as teamwork, not a contest.
How sign compatibility works
Sun sign compatibility is a simple, popular way to compare two people. It uses only the sign of the Sun in each person's chart, so it works with just a birthday and no birth time.
Astrologers look at three things. The element (fire, earth, air, water) describes temperament. The modality (cardinal, fixed, mutable) describes how a sign handles change. The angle between the two signs describes the type of relationship, whether easy, tense or complementary.
Think of it as a first impression of a pairing. It is good for fun and for starting a conversation, and it leaves out the Moon, Venus, Mars and everything else that makes each person unique.
Elements and how they mix
| Element | Signs | Core style | Usually easiest with |
|---|---|---|---|
| Fire | Aries, Leo, Sagittarius | Energetic, bold, enthusiastic | Fire and Air |
| Earth | Taurus, Virgo, Capricorn | Practical, steady, sensual | Earth and Water |
| Air | Gemini, Libra, Aquarius | Curious, social, mental | Air and Fire |
| Water | Cancer, Scorpio, Pisces | Intuitive, caring, deep | Water and Earth |
Signs of the same element tend to understand each other without explanation. Fire and Air feed each other, like a fire with oxygen. Earth and Water nourish each other, like soil with rain. Fire with Water and Earth with Air can feel mismatched at first, and they often learn the most from each other.
The angles between signs
Count the signs between two Sun signs and you get the relationship type, the same idea as aspects between planets.
- Same sign: instant recognition, and you also share the same blind spots.
- Neighbors (30 degrees): different priorities that can complement one another.
- Two signs apart, sextile (60 degrees): friendly, cooperative and easy.
- Three signs apart, square (90 degrees): friction that drives growth.
- Four signs apart, trine (120 degrees): natural flow and shared element.
- Opposite signs, opposition (180 degrees): strong attraction and mirror-like contrast.
These patterns explain why Aries and Leo often click quickly, while Aries and Cancer have to work a little at understanding each other.
How to use the 78 sign-pair pages
There are twelve signs, which gives 66 pairs of different signs, plus 12 pairs where both people share a sign: 78 in total. Each page explains the pairing for love, friendship and work.
- Choose your Sun sign and the other person's Sun sign.
- Read the overall summary and the strengths and challenges of the pairing.
- Notice which sections ring true and which do not; this is a tool for reflection.
- For a deeper look, run a synastry chart with both birth dates.
Sign compatibility is offered for entertainment and self-reflection. A high rating does not guarantee a happy relationship, and a low one does not rule it out.
Why your Sun sign is only part of the story
Your Sun describes core identity, but your Moon describes emotional needs and your Venus describes how you love. Two people who look like a difficult Sun-sign match can have a Moon-to-Moon trine that makes daily life feel easy.
That is the reason TarotDew pairs the sign pages with a synastry chart. Start broad here, then compare real planet positions to see what the Sun signs alone cannot show.
How TarotDew compares
| TarotDew | Astro-Seek | Cafe Astrology | Co–Star | |
|---|---|---|---|---|
| A page for every one of the 78 sign pairs | Yes | — | — | — |
| Free with no sign-up | Yes | — | — | No, account needed for chart |
| Ads on the page | None | Many | Many | — |
| Link to a full synastry chart | Yes | — | — | — |
| Large free text library | — | — | Yes | — |
| Entertainment disclaimer on results | Yes | — | — | — |
Checked on each site's public pages in October 2026; features change, so check them yourself too.
Frequently asked questions
How is zodiac compatibility calculated?
It compares the Sun signs of two people using their elements, modalities and the angle between the signs. Same-element and complementary pairings tend to read as easier, while squares and oppositions read as more challenging, and also more dynamic.
Which zodiac signs are most compatible?
Traditionally, signs of the same element, and signs that share an element family such as Fire with Air, are seen as easiest. Trines and sextiles flow naturally. Each pairing also has strengths, so no sign pair is simply good or bad.
Can two incompatible signs have a good relationship?
Yes. Sun-sign compatibility is only one small layer of the picture, and it ignores your Moon, Venus and other planets. Communication, values and effort shape a relationship far more than any rating, so use a pairing as a conversation starter.
How many sign pairs are there?
There are 78: 66 pairs of two different signs and 12 pairs where both people share the same sign. TarotDew has a page for each one, so you can look up any combination of Sun signs.
Is zodiac compatibility the same as a synastry chart?
No. Zodiac compatibility compares Sun signs only. A synastry chart compares the actual planet positions of both birth charts and finds the cross-aspects, so it is more detailed and can give different results for the same two signs.
Do I need a birth time for zodiac compatibility?
No. Your Sun sign comes from your birthday alone, so you do not need a birth time or birthplace. If you want a deeper comparison, a synastry chart uses both dates and can optionally include birth times.