Data Sources

Last updated on July 02, 2019

Not everything that counts can be counted, and not everything that can be counted counts. We focus on free, publicly available sources to guarantee the reproducibility of our datasets.


Our API offers a machine-readable list of all the web resources that we remix to build our citation index and our knowledge graph, along with the exact URLs that we downloaded, timestamps of the downloads, and checksums of the files we downloaded.

See our API documentation for more information.

Citation Index

Our citation index includes from the following datasets:

Knowledge Graph

Our knowledge graph is derived from the following resources. Unless stated otherwise in usage notes, Cobaltmetrics indexes all identifier mappings from each resource.

URI Badges

URI badges build upon additional resources to trigger URI alerts: