Synastry and Compatibility Features
Relationship work in Astrologer is built around the four charts of a pairing, all reachable from one loaded pair.
Open AstrologerLoad two people once
Enter both sets of birth data a single time and switch between person A, person B, the synastry biwheel, and the composite with one tap. Most software treats synastry as a separate tool you re-enter data into; here it is a view of the same loaded pair, which is the difference between checking a relationship in ten seconds and not bothering.
The overlay heatmap
House overlays are usually the most revealing part of a comparison and the most tedious to work out by hand. The heatmap shows at a glance whose planets stack in whose houses, in both directions, so a cluster in someone's seventh or twelfth is obvious before you have read a single aspect.
Readings that keep track of who is who
AI compatibility readings draw on the computed cross-aspects, overlays, and composite rather than the two sun signs, and they attribute each person correctly. That last part sounds trivial until you have read a relationship report that lost track of whose Mars was whose halfway through and drew conclusions from it.
Free, and free to share
The public synastry tool needs no account, which makes it usable as something you send someone rather than something you describe to them. Full reports, saved pairs, and progressed comparison sit behind a subscription.
Explore More
- How synastry works in Astrologer: Biwheels, cross-aspects, and composite method.
- Free synastry calculator: Compare two charts with no account.
- Best software for synastry: An honest comparison, including where others win.