Similarweb's estimates for the 1,000 most popular websites: AI chatbots sent 0.52% of their visits in September 2026, organic search 28 times as much. ChatGPT was the top AI referrer at 91% of sites. Research, government and reference sites get the biggest share.
Which of the top 1,000 websites get the most visits from AI chatbots, and which chatbot sends them (September 2026)
