Open Ephemeris
Astrology MCP Server for Claude, ChatGPT & AI Agents
Ask Claude or ChatGPT for a natal chart, transits or a Human Design bodygraph — computed from NASA JPL data, not guessed. Free to start, 150 credits, no card.
Claude and ChatGPT already know how to hold a conversation. Draw my birth chart — March 21 1990, noon, London. No download, no API key — OAuth handles sign-in and creates your account on first connect. Open Ephemeris is an approved app in the ChatGPT app directory — any ChatGPT plan can install it. Using Claude Desktop, Cursor, or another client? Use the Claude Desktop config below — every plan works there.
Pricing & access
Open Ephemeris has a free tier, with paid plans unlocking more. Check openephemeris.com for current plans.
Frequently asked questions
What is Open Ephemeris?
Open Ephemeris is astrology MCP Server for Claude, ChatGPT & AI Agents. Ask Claude or ChatGPT for a natal chart, transits or a Human Design bodygraph — computed from NASA JPL data, not guessed. Free to start, 150 credits, no card.
Is Open Ephemeris free?
Open Ephemeris has a free tier, with paid plans unlocking more.
What are the best Open Ephemeris alternatives?
People comparing Open Ephemeris also look at Bot403, Cypher eSIM, Reuily, Zalcro. See all options in the Developer Tools category on SiftFox.
Work on Open Ephemeris?
Claim this profile for free - instant with a work email at openephemeris.com.
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