# GEO and AI Search Data Reports Based on **4B+ analyzed citations, prompts, and responses** across ChatGPT, Gemini, Perplexity, Claude, and Google AI Overviews. We publish free, aggregated datasets so the community can understand how AI search engines cite sources, recommend brands, and surface content. Reports include citation share rankings by domain, citation content type breakdowns over time, top cited sources per AI model, social media citation comparisons, shopping feature usage trends, and average sources per response — updated regularly with fresh data. ## Reports - [Claude Citation Crawler Visits Over Time - April 2026](/content/data/claude-citation-crawler-visits-over-time/index.html) How Claude's citation crawler grew as a share of total AI citation crawler traffic from December 2025 to April 2026 — daily share of all tracked AI citation crawlers. - [LinkedIn Citation Page Types in AI Search](/content/data/linkedin-citation-page-types/index.html) See which LinkedIn page types AI search engines cite most. Compare Pulse articles, posts, company pages, LinkedIn Learning, jobs, developer docs, and more across ChatGPT, AI Mode, AI Overviews, and Perplexity. - [ChatGPT Citation Share - April 2026](/content/data/chatgpt-citation-share-april-2026/index.html) See the top 20 most cited domains by ChatGPT Search in April 2026 and their percentage share of total citations. Includes a March vs April comparison chart. - [ChatGPT Citation Share - March 2026](/content/data/chatgpt-citation-share-march-2026/index.html) See the top 20 most cited domains by ChatGPT Search in March 2026 and their percentage share of total citations. Includes a February vs March comparison chart. - [Google AI Mode Citation Share - April 2026](/content/data/google-ai-mode-citation-share-april-2026/index.html) See the top 17 most cited domains by Google AI Mode in April 2026 and their percentage share of total citations. Includes a March vs April comparison chart. - [Google AI Overview Citation Share - April 2026](/content/data/google-ai-overview-citation-share-april-2026/index.html) See the top 16 most cited domains by Google AI Overview in April 2026 and their percentage share of total citations. Includes a March vs April comparison chart. - [Google AI Mode Citation Share - March 2026](/content/data/google-ai-mode-citation-share-march-2026/index.html) See the top 16 most cited domains by Google AI Mode in March 2026 and their percentage share of total citations. Includes a February vs March comparison chart. - [Google AI Overview Citation Share - March 2026](/content/data/google-ai-overview-citation-share-march-2026/index.html) See the top 17 most cited domains by Google AI Overview in March 2026 and their percentage share of total citations. Includes a February vs March comparison chart. - [AI Overviews Citation Types Over Time - Q1 2026](/content/data/ai-overviews-citation-types-over-time-march-2026/index.html) What type of content does Google AI Overviews cite in Q1 2026? Daily breakdown of listicles, news, how-tos, product pages, and more from January through March 2026. - [ChatGPT Citation Types Over Time - March 2026](/content/data/chatgpt-citation-types-over-time-march-2026/index.html) What type of content does ChatGPT cite in March 2026? Daily breakdown of listicles, news, how-tos, product pages, and more. - [ChatGPT Citation Drop After GPT-5.3](/content/data/chatgpt-citation-drop/index.html) Average citations per ChatGPT response dropped across all models — GPT-5.3, GPT-5.3, and Mini — around the GPT-5.3 rollout on March 4, 2026. The drop affects ChatGPT's search behavior as a whole, not just one model. - [Google AI Mode Citation Share - February 2026](/content/data/google-ai-mode-citation-share-feb-2026/index.html) See the top 15 most cited domains by Google AI Mode in February 2026 and their percentage share of total citations. - [Google AI Overview Citation Share - February 2026](/content/data/google-ai-overview-citation-share-feb-2026/index.html) See the top 15 most cited domains by Google AI Overview in February 2026 and their percentage share of total citations. Includes a January vs February comparison chart. - [ChatGPT Query Fanouts](/content/data/chatgpt-query-fanouts/index.html) How many web searches does ChatGPT trigger per response? Track query fanout volume, average queries per response, and query length trends over time — based on gpt-4o-search data. - [YouTube in AI Search - February 2026](/content/data/youtube-citation-data-feb-2026/index.html) How did AI search engines use YouTube in February 2026? Citation share across ChatGPT, Perplexity, and AI Overviews — including top channels, video engagement metrics, age distribution, and citation trends. - [Markdown in AI Search](/content/data/markdown-in-ai-search/index.html) Markdown files make up just 0.05% of all AI search citations. This report breaks down citation share by content format across ChatGPT Search and Google AI Overviews — and explains why markdown is for AI agents, not AI search. - [Reddit in AI Search - January 2026](/content/data/reddit-citation-data-jan-2026/index.html) How did AI search engines use Reddit in January 2026? Citation share across ChatGPT, Perplexity, and AI Overviews — including top subreddits, post engagement metrics, age distribution, and citation trends. - [ChatGPT Citation Types Over Time](/content/data/chatgpt-citation-types-over-time/index.html) Track how ChatGPT Search citation content types change over the past 30 days. See the daily percentage breakdown of news articles, reviews, documentation, forums, and more — essential for understanding what content formats AI search engines prefer. - [AI Overviews Citation Types Over Time](/content/data/ai-overviews-citation-types-over-time/index.html) Track how Google AI Overviews citation content types change over the past 30 days. See the daily percentage breakdown of news articles, reviews, documentation, forums, and more — essential for understanding what content formats AI search engines prefer. - [ChatGPT Citation Share - January 2026](/content/data/chatgpt-citation-share-jan-2026/index.html) See the top 15 most cited domains by ChatGPT Search in January 2026 and their percentage share of total citations. Understand which sources AI search engines trust most. - [Google AI Overview Citation Share - January 2026](/content/data/google-ai-overview-citation-share-jan-2026/index.html) See the top 15 most cited domains by Google AI Overview in January 2026 and their percentage share of total citations. Understand which sources AI search engines trust most. - [Average Sources Per Response](/content/data/average-sources-per-response/index.html) Explore our public GEO & AI SEO dataset. See how many sources AI assistants cite per response across models like ChatGPT, Claude, Perplexity, and Gemini. We publish anonymized, aggregated insights for the community. - [ChatGPT Shopping Feature Usage](/content/data/chatgpt-shopping-usage/index.html) Track how often ChatGPT displays shopping recommendations and product cards in web search responses. Real-time analytics showing the percentage of citation-enabled responses with shopping features, essential for e-commerce optimization. - [Top ChatGPT Sources](/content/data/top-chatgpt-citations-by-domain/index.html) Live analytics showing which domains ChatGPT cites most frequently. Track citation trends for Reddit, Wikipedia, Forbes, and 20+ major websites across social, news, review, and reference categories. - [Top Google AI Overviews Sources](/content/data/top-ai-overview-citations-by-domain/index.html) Explore our public GEO & AI SEO dataset. See how many sources Google AI Overviews cite per response across models like ChatGPT, Claude, Perplexity, and Gemini. We publish anonymized, aggregated insights for the community. - [Social Media Citations by AI Model](/content/data/social-media-citations-by-ai-model/index.html) Compare how often ChatGPT, Perplexity, AI Overviews, and Grok cite social media platforms like Reddit, X, YouTube, Instagram, Facebook, LinkedIn, and TikTok. See which social networks dominate AI citations. ## How we collect this data We collect millions of prompt responses, citations, and click data from the actual user interfaces of major AI platforms — over 4 billion data points and growing. This gives us one of the largest and most authentic datasets on how AI search engines cite sources and recommend brands. ### Real UI monitoring Data straight from the interfaces of ChatGPT, Gemini, Perplexity, Claude, AI Overviews, and more. ### 4B+ data points Over 4 billion analyzed citations, prompts, and responses — one of the largest AI search datasets available. ### Continuously updated Refreshed constantly so the trends you see reflect the latest behavior of AI search engines. ### Aggregated & public Published freely for the GEO community, based on aggregated, non-identifiable trends.