Synastry: two charts compared, no magic score
Synastry compares two charts to clarify the bond’s dynamics — not a magic match score. Spikka Connect compares both charts for free; the PDF report is optional when you want depth.
A synastry calculation, not a sign score
Synastry crosses two computed natal charts: planets, houses, aspects, angles. It is not “Aries with Leo”. Spikka calculates both skies first, then Connect shows the bond on 8 axes — free, once the other person has entered their birth data.
Love, family, work: the same calculation
Couple, family, work pair, friendship: the engine is the same, the reading changes vocabulary. You need birth data for both people (time if possible). Connect invites the other person to enter it themselves; the PDF report reuses that same base when you want depth.
Connect: an invitation, then the 8 axes
You create your account, you invite the other person, they enter their birth. The relationship dashboard opens: eight axes, the duo’s strong points, nothing to pay for this step. The synastry PDF stays optional — narrative and technical layers, ordered only if you want a document to reread.
Synastry calculation: two charts, or two signs?
| What we look at | Spikka Connect | Sun-sign compatibility |
|---|---|---|
| What is calculated | Two full natal charts: positions, houses, aspects, from the birth data. | Two Sun signs, sometimes Moon and Ascendant typed in by hand. |
| Result | Eight relationship axes, with no magic “match / no match” percentage. | A score or a line of the day, valid for millions of pairs of the same signs. |
| Price | Connect is free with the account. The synastry PDF is optional. | Often a teaser, then a subscription or in-app purchases. |
| The other person’s data | They receive an invitation and enter their own birth details. | You pick their sign, or you guess it. |
| Reproducibility | Same births, same calculation, every run. | The copy changes with the model or the notification of the day. |
| Going further | An Essential / Expert PDF on the same calculated base, if you want it. | Another notification, rarely an analysis of both charts. |
A comparison of categories, made in September 2026. Sign-compatibility apps change; check the current state before deciding. Connect and the PDF complement each other: the first is shared in minutes, the second is kept.
Frequently asked questions
Are synastry and compatibility the same?
Synastry is the method (crossing two charts). “Compatibility” is everyday language. The result describes strengths and friction — not a success promise.
Do both people need a birth time?
A precise time improves houses and Ascendant. Without it, part of the reading remains possible but more limited. Enter what you know; the form guides the rest.
How is this different from Spikka Connect?
Connect is free with your account: a shareable relationship dashboard on 8 axes. The PDF report goes further (narrative, technical layers depending on the level).
Can synastry be non-romantic?
Yes. Typologies also cover family, business and other setups — the report vocabulary adapts.
How long until the PDF arrives?
After confirmed payment, production follows the terms in the T&Cs; delivery goes to the order email.
Where can I see the deliverable details?
On the Synastry product sheet: contents, Essential / Expert levels, and order access.