# AnswerTraffic

> Find and filter the traffic AI assistants send to your site: regex for GA4, Plausible, Matomo and PostHog, plus an open, sourced referrer list.

## Tools
- [AI traffic filter generator](https://answertraffic.com/): Regex and filter recipes for AI assistant traffic in GA4, Plausible, Matomo and PostHog, built from a sourced hostname list. Runs in your browser.
- [Tools](https://answertraffic.com/tools): The filter generator, the referrer checker and the UTM cleaner. All run in the browser; nothing is sent or stored.
- [AI referrer checker](https://answertraffic.com/tools/referrer-checker): Paste a referrer or a landing URL and see whether it is an AI assistant, how it is evidenced and how GA4, Plausible, Matomo and PostHog treat it.
- [UTM cleaner for utm_source=chatgpt.com](https://answertraffic.com/tools/utm-cleaner): Remove utm_source=chatgpt.com and other AI tags from a link, or strip every utm parameter, and see exactly what was removed.

## Setup guides
- [Setup guides](https://answertraffic.com/setup): How each analytics tool handles AI assistant traffic, with sources and check dates, and which tools are not covered yet.
- [Track AI assistant traffic in GA4](https://answertraffic.com/setup/ga4): What GA4's AI Assistant channel counts, where sources disagree, and a regex for a custom channel group.
- [Track AI assistant traffic in Plausible](https://answertraffic.com/setup/plausible): What Plausible's AI Assistants channel covers, what its page does not say, and a source filter recipe.
- [Track AI assistant traffic in Matomo](https://answertraffic.com/setup/matomo): Matomo's AI Assistant channel type, the 5.5.0 version limit, the segment and the retroactivity note.
- [Track AI assistant traffic in PostHog](https://answertraffic.com/setup/posthog): PostHog's AI channel type, how it classifies, and a referring-domain filter with its syntax caveat.

## Reference
- [AI assistant referrer list](https://answertraffic.com/referrers): Hostnames of AI assistants with referrer behaviour, utm_source values, evidence, dates and how four analytics tools name them. Open data, CC BY 4.0.
- [Why AI traffic shows up as Direct](https://answertraffic.com/why-direct): The mechanisms that strip the referrer from AI clicks, a dated surface table and the share of visits that carry only a tag.
- [utm_source=chatgpt.com explained](https://answertraffic.com/utm-source-chatgpt): Where the parameter comes from, a sourced timeline, what we could not verify and how to remove it.
- [Referrer behaviour changelog](https://answertraffic.com/incidents): Dated changes in how AI assistants and analytics tools label AI traffic, each with sources and a status.
- [ChatGPT traffic drop in GA4, October 2026](https://answertraffic.com/incidents/2026-10-chatgpt-utm-drop): What was reported from 9 October 2026, by whom, what is confirmed and what is not, and how to check your own data.

## Data
- [AI traffic benchmark](https://answertraffic.com/benchmark): Our own measurement (none yet, with the minimum sample we set) next to the range of published numbers and why they differ.
- [Published AI traffic numbers](https://answertraffic.com/benchmark/public-numbers): Public figures on AI referral share with sample, period, definition and source, and why they disagree.
- [Open referrer dataset](https://answertraffic.com/data): AI assistant referrer hostnames as CSV and JSON under CC BY 4.0, with fields, citation and changelog.

## About
- [Methodology](https://answertraffic.com/methodology): How facts are sourced and dated, what the evidence labels mean, and the limits of this site.
- [About AnswerTraffic](https://answertraffic.com/about): What AnswerTraffic is, what it does not do and how to send a correction.

## Open data (CC BY 4.0)
- [Referrers as CSV](https://answertraffic.com/data/referrers.csv): One row per hostname with evidence and dates.
- [Referrers as JSON](https://answertraffic.com/data/referrers.json): Same data with license and version.

Feed: https://answertraffic.com/feed.xml