The 10 Most Mentioned Domains for ChatGPT, Perplexity, and AI Overviews Across 78.6M Searches

I wanted to know which websites are mentioned the most often in AI Assistants. This should give some indication of which sites are being favored by the different systems.

I looked at the top 10 websites cited in Ahrefs Brand Radar for Google AI Overviews, ChatGPT, and Perplexity.

This is across ~76.7M AI Overviews, 957k ChatGPT prompts, and 953.5k Perplexity prompts for the month of June 2025.

Sidenote

Brand Radar isn’t just another LLM visibility monitor, we track a large amount of queries across all of these systems and you can query for any product, service, or brand and compare vs competitors. It’s more like Site Explorer than it is Rank Tracker.

Here's what Brand Radar looks like.

Contents

Mention share for top domains across AI assistants
Mention Share by AI assistant
Impression share / potential reach for top domains across AI assistants
Impression share / potential reach by AI assistant

Mention Share measures how often the model chooses a domain.

Here’s a comparison across AI assistants:

Wikipedia dominates all three, but ChatGPT (16.3%) cites it most, then Perplexity (12.5%), then AI Overviews (8.4%).
YouTube is a clear favorite in Perplexity (16.1%) and AI Overviews (9.5%) but is missing in the top in ChatGPT.
Reddit and Quora rank high only in AI Overviews (7.4% & 3.6%). They don’t crack the top-10 in ChatGPT or Perplexity. It seems Google favors user generated content sites.
News outlets like Reuters, Apple News (AP), and AS.com feature prominently in ChatGPT (4 - 2.6%) but are secondary or absent in the others. ChatGPT likes news sites.
Health/medical sites (Mayo Clinic, Cleveland Clinic) register in AI Overviews but are not in the top 10 for ChatGPT or Perplexity. Perplexity does surface niche health sites (tuasaude, alodokter).

Here are the top 10 websites by mentions in each AI assistant:

Not all citations are equal. Some things are searched more than others.

I wanted to look at the visibility or prominence of the various citations. We have Google search volumes, but there is no reliable search volume for AI assistants. We weight the citations based on historical web popularity of searches using the Google search volume numbers.

Impression Share = Mentions weighted by keyword search volume to estimate visibility.

Potential Reach = Mentions weighted by Google search volume to estimate potential exposure.

Here’s a comparison across AI assistants:

Here are the top 10 websites by Impression Share / Potential Reach for each AI assistant:

Post byPatrick Stox

Patrick Stox is an independent SEO consultant. Former Product Advisor, Technical SEO, and Brand Ambassador at Ahrefs. Before that he was a Technical SEO at IBM for many years, worked at an agency, had his own consultancy, and was in-house at a B2B company. A long time ago he started his career as a developer.

He’s an organizer for the Triangle SEO Meetup, the Tech SEO Connect conference, he runs a Technical SEO Slack group, and is a moderator for /r/TechSEO on Reddit.

Patrick was the lead author for the SEO chapter of the 2021 Web Almanac and reviewer for the 2022 chapter. He helped define the role of Search Marketing Strategist for the US Department of Labor. He also co-wrote the SEO Book For Beginners by Ahrefs and was the Technical Review Editor for The Art of SEO 4th Edition.

He’s spoken at 100+ industry events including Pubcon, SMX, Tech SEO Boost, Ad World, Digital Summit, and many more. He’s written 100+ articles for industry sites like Search Engine Land, Search Engine Journal, MarTech, and right here at Ahrefs. He was a finalist for SEO Speaker of the Year and SEO Contributor of the Year at the 2018 Search Engine Land Awards. He was also an EzineArticles Platinum author back in the day and still has the mug to prove it.

Patrick has judged nearly a dozen search awards for multiple years including the US Search Awards, UK Search Awards, and Interactive Marketing Awards. He participated in and documented the world’s largest SEO contest to date, the Wix SEO Hero contest which he arguably should have won.

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