Synastry API

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Synastry API is a Backend & APIs tool that provides comprehensive astrological calculations and AI interpretations. It offers over 100 calculations and supports 23 house systems for developers building astrology applications.

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At a glance

Pricing

Freemium · Paid · Usage-based · Enterprise

Free tier

Yes

API

Yes

Skill level

Technical

About

What is Synastry API?

Synastry API, also known as Astrology API, is a robust backend solution for developers looking to integrate advanced astrological calculations into their applications. It offers over 100 calculation types, including natal charts, transits, synastry, Vedic, and Chinese astrology, all powered by the precise Swiss Ephemeris. With support for 23 house systems and AI-powered interpretations, it enables the creation of sophisticated astrology apps, horoscope platforms, and compatibility analysis tools. The API boasts fast response times, typically under 300ms, and provides flexible pricing plans including a generous free tier, making it accessible for projects of all sizes from personal websites to enterprise solutions.

Best used for

Ideal for developers who need to integrate precise astrological calculations into their applications, build horoscope apps, and create compatibility analysis tools. Especially valuable for those requiring high accuracy with Swiss Ephemeris and AI-powered interpretations for diverse astrological systems.

Common actions

integrate astrology data

build astrology apps

calculate birth charts

interpret astrological data

analyze compatibility

aicompatibilityBirth ChartAstrology APIsynastryHoroscopesDevelopersVedic astrology

Capabilities

Key features

100+ astrology calculations
23 house systems support
AI-powered interpretations
Swiss Ephemeris precision
Synastry analysis
Vedic astrology support
Chinese astrology support

Target Audience

developerstartup foundersmall business owner

Integrations

Not yet documented

Pricing & Plans

Freemium · Paid · Usage-based · Enterprise

Freemium

FAQs

What is the free tier limit for Astrology API?

Astrology API offers a Forever Free Tier that includes 50 API requests per month. This free plan provides full access to all 100+ calculation types, 23 house systems, and AI-powered interpretations, allowing developers to test and build their applications without any upfront cost.

How fast are the response times for Astrology API?

Astrology API is designed for speed, delivering responses in approximately 300ms on average. This is significantly faster than many competitors, ensuring efficient data retrieval for applications. The optimized Swiss Ephemeris implementation contributes to consistent sub-second response times.

Does Astrology API support different astrology systems like Vedic or Chinese?

Yes, Astrology API provides comprehensive support for various astrological systems. This includes Vedic/Jyotish astrology with sidereal calculations and nakshatras, as well as Chinese astrology with BaZi (Four Pillars) and Chinese zodiac signs. All calculations maintain Swiss Ephemeris precision.

What happens if I exceed my request limit on a paid plan?

Astrology API offers flexible overage options. If you exceed your request limit, additional request blocks are available for $10 per 1,000 requests. They also provide volume discounts for 1M+ requests, smart overage protection, and real-time usage monitoring with predictive alerts.

What house systems are supported by Astrology API?

Astrology API supports 23 different house systems, which is significantly more than many other APIs. These include popular systems like Placidus, Koch, Regiomontanus, Campanus, Equal, Whole Sign, Porphyry, Morinus, Alcabitius, Topocentric, and Meridian, catering to diverse astrological needs.

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