Anthropic is the more common of the two in our index: it runs on 6,634 websites against 1,820 for Cursor, and 1,374 sites use both. Counts come from real scans, not vendor claims.
Anthropic is an AI safety company that develops Claude, a family of large language models, and provides an API for building AI-powered applications. The anthropic-domain-verification TXT record confirms domain ownership for Anthropic services.
Cursor is an AI-powered code editor (IDE) that uses large language models to generate, edit, and explain code. The cursor-domain-verification TXT record confirms domain ownership for Cursor services.
1,374 sites run both Anthropic and Cursor. That is 75% of the sites using Cursor, the smaller of the two.
Want to know which one a particular site uses? Look it up and see its whole stack, or compare two sites side by side.