Free on the web
Free astrology tools and chart calculators
Cast a natal chart, look up what is transiting it, check who is retrograde and compare two charts — in the browser, with no account and no email. The same Swiss Ephemeris that drives the apps drives these.
Run these in your browser
Free, unlimited and no sign-up. Each one shows the numbers it worked from rather than only the conclusion.
Natal chart
Wheel, placements and aspect grid from birth date, time and place.
Free · no account
Current transits
What is aspecting your chart right now, with orbs and whether each is applying or separating.
Free · no account
Retrograde calendar
Every station and retrograde window for the next eighteen months, with the exact time each planet turns.
Free · no account
Next full moon
The exact minute of the next full moon, in your own timezone, with the sign it falls in.
Free · no account
Saturn return
The exact dates Saturn comes back to where it stood at your birth — usually three, with the stations that space them.
Free · no account
Synastry
Two charts side by side, cross-aspects listed and ranked.
Free · no account
These need the app
Anything that has to remember your chart, run while you are not looking, or send you something belongs on a device rather than on a page.
Best-day planner
Days ranked against your own chart. Preview here, plan in the app.
In the app
Transit alerts
Notifications that fire on orb, not on the calendar month.
In the app
Astrocartography
Your planetary lines on a world map, relocatable.
In the app
Ask the Owl
Questions answered against your placements, with the technique shown.
In the app
Questions people ask before they start
- Are these astrology tools actually free?
- Yes. Every tool on this page runs without an account, without an email address and without a usage cap. We sell reports and app subscriptions; the calculators are not the product being sold.
- Do you store my birth data?
- Not unless you sign in and save a chart on purpose. A chart cast anonymously on the web is calculated, rendered, and never written to our database.
- Which ephemeris do these calculators use?
- The Swiss Ephemeris, the same data set professional astrology software uses. Positions are computed on the server to arcsecond precision rather than approximated in the browser, which is why a station or an exact aspect time here matches what your other software says.
- What is the difference between the free tools and the app?
- The tools answer one question at a time and forget you afterwards. The app keeps a chart library, watches your transits in the background and tells you when something becomes exact. The mathematics underneath is identical.