CLSLCPINP
CLS Debugger
Check and visualize the Cumulative Layout Shift of any website
LCP Debugger
Find and fix the Largest Contentful Paint of any website
INP Debugger
Find and fix slow interactions on any website
Other free tools
HTTP/2 Test
Check whether any website is served over HTTP/2
http2test.comHTTP/3 Test
Check whether any website supports HTTP/3 (QUIC)
http3test.comHTTP Caching Check
Check and debug the HTTP caching headers of any URL
httpcaching.comHTTP Compression Check
Check gzip and brotli compression of any URL
httpcompression.comContent-Type Check
Check the Content-Type response header of any URL
contenttype.netFree Online Port Scanner
Scan open TCP ports on any host or IP address
portscan.comSPF, DKIM and DMARC Checker
Check email deliverability, MX records and blacklists for any domain
scan.mxEuropean by default. Measurement server in Finland, reports stored in an EU database. How the data is handled.