The Definitive Human Design API
Calculate the complete Human Design bodygraph from a single POST request. Get exact center definitions, active gates, profile, and incarnation cross with sub-arcsecond NASA JPL precision.
The API for Human Design Apps
Complete Bodygraph Data
Calculate all 9 centers, 64 gates, and 36 channels with exact definition states and planetary activations for both Personality and Design.
Core Mechanics
Instantly retrieve the user's Type, Strategy, Inner Authority, Profile (e.g. 3/5), and Incarnation Cross.
Deep Detail
Includes line activations for every gate, color, tone, and base calculations for advanced PHS (Primary Health System) and psychology.
JPL Precision
Unlike generic libraries, our Human Design engine calculates the exact moment the Sun was 88° behind the natal position using NASA JPL data.
Frequently Asked Questions
Is there a Human Design API?+
Yes. OpenEphemeris provides a production-grade Human Design API: a single POST request returns the complete bodygraph — all 9 centers, 64 gates, and 36 channels — plus Type, Strategy, Inner Authority, Profile, and Incarnation Cross, with line, color, tone, and base detail for every activation.
How are Human Design charts calculated?+
Every chart combines two calculations: the Personality chart from the exact birth moment, and the Design chart from the exact moment the Sun was 88° of solar arc behind its natal position. Unlike generic libraries that approximate this, our engine solves it directly against NASA JPL DE440 ephemeris data with sub-arcsecond precision.
Can AI agents generate Human Design charts?+
Yes. The OpenEphemeris MCP server gives Claude, Cursor, and any MCP-compatible client access to 91 astrology tools, including Human Design bodygraphs, composites, and transit overlays. Setup guide at openephemeris.com/astrology-mcp.
Is there a free trial?+
Yes. Every account starts with a one-time grant of 150 free trial credits, no credit card required. A full Human Design bodygraph costs 2 credits, and credits never expire.
Ready to map the mechanics?
The Explorer tier is free to start. Build your next HD application with complete confidence in your math.
Human Design is a system originated by Ra Uru Hu. OpenEphemeris is an independent calculation service and is not affiliated with, endorsed by, or licensed by Jovian Archive.