Free Astro ApiAstrological Data for developer
High-precision natal charts, transits, and synastry calculations for your next astrology app. Built for developers who demand accuracy and speed.
Global Accuracy
Calculations for any location on Earth with precise timezone handling.
Lightning Fast
Optimized C-based engine (Swiss Ephemeris) for millisecond response times.
Developer First
Clean REST API, comprehensive documentation, and 99.9% uptime SLA.
Built for Modern Developers
Pure JSON responses, typed schemas, and easy integration with any stack.
Native JSON API
Get clean, predictable JSON responses ready for your frontend. No parsing complex text or legacy formats.
Zero Config Integration
Works with React, Vue, Node.js, Python, or any HTTP-capable language. Just fetch and display.
Type-Safe Responses
Consistent data structures for planets, houses, and aspects make TypeScript integration a breeze.
{
"subject": {
"name": "Gabriel",
"city": "Paris"
},
"planets": [
{
"name": "Sun",
"sign": "Vir",
"pos": 12.7,
"house": 11
}
],
"aspects_summary": {
"total": 28,
"major": 28,
"by_type": {
"Conjunction": 12,
"Opposition": 5
}
}
}Planetary Positions
Precise calculations for all major bodies: Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.
- • Tropical Zodiac
- • Retrograde status
- • Precise Geocentric Positions
House Systems
Standardized calculations using the most popular house system for Western Astrology.
- • Placidus System (Default)
- • 12 Houses Calculation
- • Ascendant & Midheaven (via Cusps)
Aspects & Geometry
Detailed geometric relationships between planets for in-depth interpretation.
- • Major Aspects (Conjunction, Trine, Square, etc.)
- • Orbs calculation
- • Precise Angular Separation
Frequently Asked Questions
Is this API free to use?
Yes! We offer a generous Free Tier that allows up to 80 requests per day forever. It's perfect for hobbyists, students, and testing.
What astrology system do you use?
We specialize in Western Astrology calculations using the Swiss Ephemeris (the gold standard in the industry) for maximum precision.
Can I use this for commercial apps?
Absolutely. Our Entry and High tiers are designed for commercial production use with high rate limits and priority support.