Synastry calculator: compare two birth charts
Synastry lays two birth charts over each other and shows how two people meet: where it flows between you, where it rubs, and what you create together.
You start with your own chart. Then, with a free account, you add the other person — partner, friend, ex — and the app compares the two.
Eight areas instead of one percentage
A single “78% compatible” tells you nothing. The relationship is broken down into areas that work on their own: partnership, attraction, communication, emotional safety, endurance, friendship, the sense of a fated meeting, and transformation.
On top of that comes friction — how much tension there is between you. Zero is not good news: a bond without friction tends to be calm, but not very alive.
What else you can try
- Six deeper readings of the relationship — how you argue and listen to each other, your emotional languages, who you see in the other person.
- A composite chart — the relationship itself as one chart.
- When the sky touches your Venus and Mars — the days when relationships tend to move.
What you need
The date, time and place of birth of both people. Without the time the houses cannot be calculated and synastry says less — the app tells you so and does not fill in what it doesn't know.
It is a map, not a verdict. It shows where things come easily between you and where they take effort. What do you already know about that effort?