Sintonia — Astro

Sintonia computes. It doesn't guess. Behind every screen is an ephemeris engine written from scratch, running entirely on your device: no external service, no third-party astronomy API. Planetary positions are accurate to within a few arcseconds of the Swiss Ephemeris, and every build is checked by an automated regression suite. That's the difference between an app that shows you generic text and one that actually computes the sky at the moment you were born. YOUR NATAL CHART - Full natal wheel: ten planets, North Node, Chiron, twelve houses - Placidus, whole-sign and equal house systems - Major aspects with configurable orbs - Big Six at a glance: Sun, Moon, Mercury, Venus, Mars, Ascendant - Interpretation built from your chart's actual geometry TRANSITS AND CHAPTERS - Current transits to natal placements, coloured by supportive or challenging tone - Chapters: the long outer-planet arcs, laid out on a timeline - Astronomical event finding across arbitrary date ranges PEOPLE AND SYNASTRY - Save profiles for the people who matter - Synastry between any two charts: cross-aspects and house overlays - Davison composite - Connect with other Sintonia users so their birth data populates your network - Astrological family: compatibility matrix, balances, generations TAROT - Complete 78-card Hermetic deck - Booklet meanings, upright and reversed - Spreads with explicit reasoning: resonances between cards, repeated suits and numbers, tensions between upright and reversed AND MORE - Astrocartography: MC, IC, ASC and DSC lines for every planet on a world map - Human Design: full bodygraph, type, authority, profile, centres - Tzolkin: the 260-day count and the KIN of the day - Esoterica pack: numerology, I Ching, gematria, elemental profile YOUR DATA Your birth date, time and place are used for the calculation and stay yours. Usage analytics are off until you switch them on. You can delete your account and all associated data from inside the app, at any time. Sintonia offers symbolic readings and material for reflection. It does not provide medical, legal or financial advice, and makes no predictions about future events.