Transparency
Disclosure & disclaimer
How this site works and what it is not.
Accuracy
CacheLens performs a static analysis of the headers you paste, following RFC 9111. It does not fetch any URL. Actual cache behavior also depends on the request method, status code, request headers, and each cache's policy, so treat the result as guidance rather than a guarantee.
Privacy
Everything runs in your browser. Nothing you paste is transmitted, stored, or logged.
Affiliate links
Some outbound links — for example to CDN or hosting providers — may be affiliate links: if you sign up through them we may earn a commission at no extra cost to you. This never affects the analysis, and the tool is free to use regardless. Display advertising may also appear.