Install the extension
Add CircleCheck to Chrome. The extension uses one fixed CircleCheck API endpoint, so there is no Worker URL for users to configure.
Circle a suspicious claim. Get evidence before you share.
CircleCheck reads only the part of the page you select, searches for supporting or contradicting sources, and returns a cautious verdict with links.
Start here
Install, sign in, then circle.
Sign in
Use Google or Meta login from the popup. Free checks are tied to the signed-in account, not to a browser setting.
Circle a claim
Move your cursor in a closed circle around a headline, post, paragraph, image, or video area. CircleCheck opens a small evidence card beside it.
Workflow
What happens during a check
Capture
The extension samples visible text, nearby image metadata, page title, URL, and recent video captions when available.
Retrieve
The Worker keeps provider keys private and performs a bounded evidence search or article extraction.
Assess
The result labels the claim as supported, contradicted, limited support, or unclear, with source links.
Quota
Free to try, measured honestly.
Each signed-in user gets 10 free claim checks. After that, CircleCheck asks whether a $10/month plan for roughly 150-200 checks would feel worth paying for. No payment gateway is connected yet.
Free checks
10
Exploring
$10/mo
Target allowance
150-200
Guardrails
Built to avoid sensitive fields.
CircleCheck does not scan a whole page in the background. It watches recent mouse coordinates for roughly 800-900ms without page context to detect a circle gesture, and only then captures circled-region data.
The extension refuses checks that intersect password, email, phone, payment, one-time-code, textarea, or editable regions.
The backend trims input, validates URLs, keeps provider secrets out of the extension, and displays only retrieved source URLs.
Use it carefully
CircleCheck is an evidence aid, not a truth oracle.
It helps you slow down, compare sources, and decide whether a claim deserves trust.