Natal chart and ascendant without an account
Coppiastrale calculates a natal chart from a birth date, optional exact time, city, and country. The result covers the Sun, Moon, Ascendant, planets, 12 houses, aspects, and a printable chart wheel. It uses Swiss Ephemeris and applies the correct time zone for the birthplace. Without an exact birth time, the site still calculates the planets, while clearly warning that the Ascendant and houses are less reliable.
The core calculator is free, does not require an account, and says birth data is used temporarily for the requested calculation rather than stored in a database.
Couple synastry beyond sun signs
The synastry tool accepts two sets of birth data and compares the planets across both charts. Its result includes a double chart wheel, inter-chart aspects, an affinity score, attraction points, likely friction, and areas where the relationship may grow. This is more detailed than the separate sign-compatibility pages, which only provide a quick sun-sign view.
Result pages can be printed or saved as a PDF from the browser. They also include AI-written interpretation sections, but the buttons for the complete premium reading are still marked as coming soon, so the current listing treats Coppiastrale primarily as a free calculator.
