Downloading OLS Data Releases
The OLS internal database format is undocumented and subject to change at any time. We therefore strongly recommend that the OLS API and/or upstream OWL files from ontology vendors are used to access ontology information rather than the OLS data dump, with the exception of the SSSOM mappings file which is provided with a standardised representation.

We recognise that the EBI OLS dataset can be useful in some cases to e.g. set up a local instance of OLS for development purposes, or to perform one-off analyses of the ontology corpus. To this end, snapshots of OLS datareleases can be downloaded from https://ftp.ebi.ac.uk/pub/databases/spot/ols. And the latest snapshot can be found at https://ftp.ebi.ac.uk/pub/databases/spot/ols/latest

DescriptionFileFormat
OLS internal data representation of all loaded ontologies (~50 GB uncompressed)ontologies.json.gzGZIP JSON
As ontologies.json.gz but after running through the OLS linker to add references between ontologies and to external databases (~150 GB uncompressed)ontologies_linked.json.gzGZIP JSON
The neo4j database generated from ontologies_linked.json by the OLS json2neo tool, after creating db indexes (Requires Neo4j community 4.4.9)neo4j.tgzNeo4j database
The solr database generated from ontologies_linked.json by the OLS json2solr tool (Requires Solr 9.0.0)solr.tgzSolr core
Mappings extracted from all ontologies in SSSOM TSV formatmappings_sssom.tsv.gztab separated file