Website testing
Checkers for speed, accessibility, SEO, security headers, DNS and email setup, broken links and markup, online or run yourself.
277 results, page 4 of 10
EasyDMARC DKIM Lookup
A free web tool that looks up and validates a domain's DKIM record for a given selector.
EasyDMARC DMARC Lookup
A free web tool that looks up a domain's DMARC record and checks it for configuration errors.
Ecograder
Online checker that reports a website's page weight, performance and estimated emissions.
EXPERTE Accessibility Checker
An online checker that crawls a website and tests each page for accessibility problems.
EXPERTE Bulk Mobile Friendly Test
A free online test that checks many pages of a website for mobile-friendliness at once.
Experte Page Speed Test
A free bulk page speed test that runs PageSpeed Insights metrics across many URLs at once.
FortiGuard Web Filter Lookup
Online lookup showing how Fortinet's FortiGuard web filter categorises a URL or IP address.
Gatling
A load testing tool for web applications and APIs, with an open-source edition and hosted enterprise platform.
GF.dev HTTP/2 Compatibility Check
A free web tool that checks whether a server negotiates HTTP/2 via ALPN.
GF.dev HTTP/3 & QUIC Check
A free web tool that checks whether a server advertises HTTP/3 through its Alt-Svc header.
GF.dev TLS Cipher Suite Scanner
A free web tool that reports the TLS version and cipher suite a server negotiates.
GiftOfSpeed
A free website speed test and Lighthouse-based speed and uptime monitoring service.
Globalping
A free service for running ping, traceroute, DNS, MTR and HTTP tests from probes worldwide.
GlockApps
An online email deliverability tester that checks inbox placement, spam scores, blocklists and domain authentication.
Google Admin Toolbox Dig
Google's free web-based DNS lookup tool that queries a domain's records and shows the results.
Google Postmaster Tools
Google's web dashboard for checking a sending domain's reputation and mail deliverability to Gmail.
Google Rich Results Test
Google's free web tool for testing whether a page qualifies for rich results in search.
Google Safe Browsing Site Status
A lookup in Google's Transparency Report that shows whether Safe Browsing flags a site as unsafe.
Google Tag Assistant
Google's web tool for checking and debugging analytics and tag installations on a website.
Grafana k6
An open-source command-line load testing tool that runs test scripts written in JavaScript.
Gridinsoft Website Reputation Checker
A free online checker that reports whether a URL or domain looks safe, suspicious or dangerous.
HackerTarget WhatWeb Scan
An online scan that runs WhatWeb and Wappalyzer to fingerprint the technologies behind a website.
Hardenize
A web site configuration tester and monitoring service for network, certificate and security settings.
HetrixTools
A hosted uptime, server metrics and blacklist monitoring service with a free tier and instant alerts.
Hey Meta
A web tool that checks, previews and edits a website's meta tags and social cards.
HSTS Preload List Submission
A web tool to check a domain's HSTS preload status and submit it for inclusion.
HTMLProofer
A Ruby tool that tests rendered HTML files for broken links, images and markup problems.
htmltest
Command-line tool that tests generated static HTML for broken links, missing images and markup problems.
HTTP Observatory
Mozilla's web tool that grades a site's HTTP security headers and gives fix recommendations.
httpstatus.io
A web tool for checking HTTP status codes, response headers and redirect chains of URLs.
