If you have searched for a free birth chart, you have met these two: astro.com, the venerable Swiss site that has calculated charts since the nineties, and Astro-Seek, the newer free toolbox that keeps adding features. Both are free. Both are accurate. They serve different kinds of users, and picking the right one saves you a lot of clicking.
Calculation quality
Start with the reassurance: for standard natal charts, both sites are accurate. Astro.com runs on the Swiss Ephemeris, the same professional-grade calculation library used by serious astrology software, and has a decades-long reputation for precision. Astro-Seek’s calculations are equally reliable for ordinary chart work. If someone tells you one of them “gets charts wrong,” they are almost always seeing a settings difference, not a calculation error.
Settings differences are real, though. The two sites default to different house systems and display options, so the same birth data can produce charts that look different at first glance. If that happens, check the house system setting before assuming a mistake. Our piece on why astrology tools differ explains the common causes.
Depth of chart options
This is astro.com’s home turf. Its extended chart selection offers an enormous menu: transits, progressions, solar returns, synastry, composites, asteroids, fixed stars, and dozens of house systems and chart styles. Working astrologers use astro.com precisely because whatever specialized chart they need is probably in that menu. No free site matches its range.
Astro-Seek covers the common cases well: natal charts, transits, synastry, solar returns, and ephemeris tables, plus genuinely useful extras like transit calendars and a large library of free articles. What it lacks is astro.com’s long tail of specialized options. For most students this is not a real loss. It becomes one only when your studies get technical enough to need, say, a specific harmonic chart.
Ease of use
Astro-Seek wins here by a clear margin. The interface is cleaner, the tools are easier to find, and a beginner can generate a transit chart without reading a manual. Astro.com’s interface carries decades of accumulated features, and it shows: the menus are dense, the terminology is technical, and first-time users regularly generate the wrong chart type by accident.
The learning curve on astro.com does flatten. Once you know where the extended chart selection lives and which options you use, it becomes fast. But the first hour belongs to Astro-Seek.
Interpretations and learning material
Astro-Seek includes more free interpretive content: articles on planets, signs, houses, and aspects, plus tools that annotate your chart. It is the better site for learning what your chart means. Astro.com offers some free interpretations, including the well-known short report, but its strength is calculation, not teaching. Pair either one with our guide to what a house system is when you start reading houses.
The verdict
Choose Astro-Seek if you are learning, want transits and calendars in a friendly interface, or just need a solid chart without a manual. It is the better daily driver for most people.
Choose astro.com when your studies outgrow the basics: you need specialized charts, precise control over house systems and orbs, or the calculation authority that professional astrologers trust. Expect to spend an evening learning the interface, and consider it tuition.
Use both if you are serious. Run the chart on Astro-Seek for the friendly overview, then take the same data to astro.com when you need the deep tools. They are both free, they agree on the sky, and together they cover everything a student needs.
A last practical tip: whichever site you choose, save your chart data in both places. Birth data is tedious to re-enter, and having your profile set up on Astro-Seek and astro.com means you can move between the friendly overview and the deep tools without friction. Most students who stay with astrology end up doing exactly that within their first year.