About

An independent, monthly look at what AI tools tell people in the UK about their health.

What patients are told is built by Mack Grenfell. Mack runs Trakkr, an AI-search company that tracks what tools like ChatGPT say about brands. Trakkr covers the small running costs. The project sells nothing, it isn’t a route to selling Trakkr, and nobody pays for it to say anything.

Every month it puts the same 1,074 health questions to Google AI Overviews, Google AI Mode and ChatGPT (logged out), typed the way people type them. Each answer is checked against NHS England guidance: the NHS page for that question, or GOV.UK for driving rules. If the NHS doesn’t say it, we don’t check it.

What it measures follows the asks in an open letter that 115 health charities and professional bodies sent to the UK’s AI minister in November 2026: whether AI points people to trusted UK sources, to the right NHS service and to specialist support, and how that differs for different people. The site is not connected to the letter or the organisations that signed it.

The answers are checked by AI models, Claude Haiku and Claude Sonnet, made by Anthropic, against the stored NHS lines, with an extra review for emergency-level results. Anthropic makes Claude, which competes with the tools tested here. That is why every check, every answer and every NHS line is published, so anyone can check the checking. No clinician has reviewed these results.

The method and the data are open. You can read how every check works and download every question, answer, check and source behind the numbers on this site. Every change we make is listed in the corrections log.

Found something wrong? Write to [email protected]

What this site is not

Not part of the NHS or the government, and not endorsed by either.
Not endorsed by any charity or by the Patient Information Forum. Where a charity is named, it is because the NHS page or the charity’s own page links it to that condition.
Not medical advice. If you are worried about your health, use NHS 111 online, call 111, or call 999 in an emergency.

“PIF TICK-certified” means an organisation appears on the Patient Information Forum’s published list. We use that list as a fact about sources. PIF has not reviewed this site.