Similarweb says it can track conversational AI ads.

The new AI Ads tracking data set for ChatGPT and Google’s AI Mode and AI Overviews pulls insights from anonymized web usage data provided by a panel of Similarweb users, instead of relying on synthetic prompts. Similarweb reports that 26 percent of ChatGPT responses and nearly 30 percent of ad-eligible Google AI Mode queries include a sponsored ad. [Link: Similarweb Unlocks the Black Box of AI Ad Placements Across ChatGPT, Google AI Overviews, and AI Mode | https://www.businesswire.com/news/home/20260818652197/en/Similarweb-Unlocks-the-Black-Box-of-AI-Ad-Placements-Across-ChatGPT-Google-AI-Overviews-and-AI-Mode | Business Wire]