AI traffic
Which AI engines actually send referral traffic to the web, and how fast it's growing. Measured from real AI-referral sessions across an anonymised panel of GA4 properties, broken down by engine and by industry.
AI referral traffic over time
Daily AI-referral sessions across the panel. The long arc is up and to the right; the week-to-week line is noisier.
Who sends the traffic
Every AI engine ranked by its share of referral traffic, with 30-day momentum and a 60-day trend.
| # | Engine | Share of AI traffic |
|---|---|---|
| 1 |  ChatGPT | 90.8% |
| 2 |  Gemini | 4.8% |
| 3 |  Claude | 1.6% |
| 4 |  Perplexity | 1.5% |
| 5 | CCopilot | 1.2% |
| 6 | PPoe | 0.03% |
| 7 | YYou.com | 0.03% |
| 8 |  Grok | 0.02% |
| 9 |  DeepSeek | 0.00% |
How the mix is shifting
The engine breakdown of AI referral traffic, week by week, since tracking began.
Where AI traffic lands
The verticals seeing the most AI-referral momentum, by 30-day change across the panel.
Built from referral sessions logged in Google Analytics across an anonymised panel of 4.2K properties, attributed to AI engines by their source domains (chatgpt.com, gemini.google.com, perplexity.ai and more) and re-counted daily. Market share is each engine's portion of all AI-referral traffic over the most recent 30 days. Counts are panel volume, not the whole web.
Common questions
Which AI engine sends the most referral traffic?
ChatGPT sends by far the most AI referral traffic to the web today, with Perplexity, Gemini and Copilot a smaller but fast-growing share. The dataset breaks referral sessions down by engine, with momentum and industry splits.
Is AI referral traffic growing?
Yes - quickly. AI engines still send a small share of total web traffic, but the curve is rising fast. This dataset tracks it daily across an anonymised GA4 panel.
How is AI referral traffic measured?
From referral sessions in an anonymised panel of GA4 properties, attributed to AI-engine source domains (for example chatgpt.com and perplexity.ai), then aggregated by engine and industry.