Page performance with waterfall charts.
Web & Hosting
Site CheckersCheck site speed, DNS, HTTPS certificates and competitors’ tech stacks.
Speed test results vary by location — test from nodes in your target market.
DNS Checker
FreeCheck DNS propagation worldwide.
SSL Labs
FreeCheck a site’s HTTPS certificate setup.
See which technologies and plugins competitor sites use.
MXToolbox
FreeEmail DNS and blacklist checks.
IntoDNS
FreeDNS configuration health check.
Detect the technologies a site uses.
WebPageTest
FreeWeb performance tests from many locations.
Pingdom
FreeWebsite speed test.
UptimeRobot
FreeWebsite uptime monitoring.
Security Headers
FreeSecurity headers check.
SSL Checker
FreeSSL certificate check.
Mail Tester
FreeTest whether your email lands in spam.
Responsively
FreeResponsive preview at many sizes.