About
What Stella is, how it calculates your chart, and who builds it.
Last updated: July 15, 2026
What is Stella
Stella is a web tool that reads your Western astrology birth chart (natal chart) and horoscope from your birth date, time, and place. Anyone can use it right away with no sign-up, and unlike a plain horoscope that looks at your Sun sign alone, Stella calculates the whole sky at the moment you were born for a fuller picture of you.
What is a birth chart
A birth chart is a map of where the Sun, Moon, and planets sat in the sky the moment you were born. The sign you usually know is just one of them — your Sun sign — and Stella adds your Moon sign, Rising sign, and the twelve houses so it can describe your character and the areas of your life in far more detail.
What you can do
Stella maps the sky at the moment you were born and shows at a glance where the Sun, Moon, rising sign, and planets fall. Your daily horoscope overlays the planets moving through the sky right now onto your chart to read the day’s flow, while your love outlook looks at Venus, Mars, and the relationship houses to read how you love and when the timing is right. Every reading is available in Korean, English, Japanese, and Chinese.
How it calculates
Stella computes the positions of the planets at your moment of birth using the tropical zodiac and the Placidus house system. It relies on a public-domain ephemeris library, resolving the geocentric positions of ten bodies from the Sun to Pluto with astronomically precise accuracy.
How your data is handled
Your birth date, time, and place are calculated entirely within your browser and are never sent to a server. You can read exactly how personal data is stored and deleted in our Privacy Policy.
Who builds it
Stella is built and run by sobok, a solo indie developer. It began with a simple goal: make astrology easy to enjoy.
Please keep in mind
Stella’s readings are for self-reflection and fun, and are not a substitute for professional medical, legal, or financial advice. The full terms for using the service are in the Terms of Service, and if you have a question or suggestion, reach out through the Contact page.