Compatibility, calculated

How compatible
are you, really?

Quick answer: SyncChart calculates a free harmony score from both birth charts, with three real insights. Full written reports are optional one-time purchases from $5.99 to $39.99, with no subscription.

Enter both birth dates, times and places. We calculate both natal charts with a NASA JPL ephemeris engine, compare every cross-chart aspect, and give you a free harmony score with three real insights — the full written report is optional.

0.00003°
Max ephemeris error vs JPL
Every
Cross-chart aspect weighed
5
Dimension scores, free
$0
Subscriptions, ever
I

Person 1 — You

Can't find your city? Enter coordinates manually
II

Person 2 — Partner

Can't find your city? Enter coordinates manually

Accurate birth times give accurate houses and scores. Birth data is used only to compute your charts.

How it works

From birth data to an honest score

I.

Two real birth charts

Both charts are computed from date, time and place with a JPL DE421 ephemeris — planets, houses and angles to arc-second precision.

II.

Every aspect, weighed

All cross-chart aspects are scored by type and tightness of orb. Flowing and tense contacts are weighed openly — the method is published, the math is reproducible.

III.

A score with receipts

Your free card shows the Harmony Index, five dimension scores and three chart-specific insights. Every number in the paid report cites the aspect behind it.

Browse pairings

Popular sign pairings

Aries × Leo Taurus × Virgo Gemini × Libra Cancer × Scorpio Leo × Sagittarius Virgo × Capricorn Libra × Aquarius Scorpio × Pisces All 144 pairings →

Pairing pages are sketches from sign data alone. Your free card replaces the sketch with a calculation from both full birth charts.

Free tools

Five free calculators, one real engine

Free Birth Chart Calculator Free Moon Sign Calculator Free Rising Sign Calculator Free Venus Sign Calculator Free Composite Chart Calculator All free tools → Monthly horoscopes → Rising & Sun combinations →

Every calculator runs on the same NASA JPL ephemeris engine as the compatibility card — computed from real birth data, free, no sign-up.

Reports & pricing

One payment. Yours forever.

Mini Compatibility Report

The essentials: compatibility overview, emotional connection and attraction & chemistry, with your five dimension scores interpreted.

$5.99

Create your free card

Full Compatibility Report

All six chapters for both of you: emotional connection, communication, chemistry, friction map and long-term potential.

$12.99

Create your free card

Natal Chart Report — Person 1

A full natal reading for the first person on the card: core identity, emotional nature, mind, love, drive and growth edges.

$24.99

Create your free card

Bundle: Compatibility + Both Natal Reports

The full compatibility report plus an individual natal report for each of you. The complete picture, one payment.

$39.99

Create your free card

One-time payment — no subscription, no auto-charge. Secure checkout by Waffo.

Frequently Asked Questions

Is SyncChart free?

The harmony score is free, with three real insights. Full reports are one-time purchases from $5.99 to $39.99. There is no subscription - you are charged once, not forever.

What do I need to enter?

Both birth dates, times, and places. SyncChart calculates both natal charts and compares them.

What does the free harmony score include?

Three real insights calculated from both birth charts.

What is the refund policy?

Refunds are available within 30 days, no questions asked.