Ontology Lookup Service

Public repository and search service for biomedical ontologies, with a REST API and MCP server.

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The Ontology Lookup Service is EMBL-EBI's public repository and search tool for biomedical ontologies, offering a website, REST API, and MCP server for looking up ontology terms and hierarchies. The open-source stack can also be self-hosted for custom ontologies, and it's aimed at life-science researchers and bioinformaticians who need a consistent, current source for standardized biomedical terminology.

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Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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