OpenAI is the more common of the two in our index: it runs on 3,925 websites against 1,718 for Cursor, and 998 sites use both. Counts come from real scans, not vendor claims.
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.
OpenAI provides the GPT family of models and the ChatGPT product line.
998 sites run both Cursor and OpenAI. That is 58% 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.