Cloudflare’s 2025 Internet Year in Review describes activity observed through its network and related measurement sources. Its category charts are useful context, but they do not all measure the same population.
Keep the categories separate
The generative-AI services ranking is a category ranking, not proof that AI platforms dominate all internet services. The report separately identifies Google as the leader in its overall internet-services ranking and explains that ranking’s aggregate 1.1.1.1 methodology.
Read crawler measurements narrowly
The report separates verified-bot activity, AI crawl purposes, HTML traffic share, and crawl-to-refer ratios. Use the relevant section and its measurement period rather than moving a percentage from one chart to another.
Crawl-to-refer compares classified HTML requests with detectable HTML referrals. It does not count AI-answer citations or predict a single website’s return on content.
The Similarweb image below is a historical category chart with its own source and methodology. Compare like-for-like measurements before drawing a market-share conclusion.
Read visibility metrics for site-level definitions.
