Website testing
Checkers for speed, accessibility, SEO, security headers, DNS and email setup, broken links and markup, online or run yourself.
277 results, page 6 of 10
muffet
A fast command-line link checker, written in Go, that crawls a website to find broken links.
MultiRBL
A free tool that checks a mail server IP against over 200 DNS blacklists and whitelists.
MXToolbox Blacklist Check
An online tool that tests a mail server IP or domain against over 100 DNS blacklists.
MXToolbox DKIM Lookup
A free web tool that tests whether a domain publishes a valid DKIM public key for a selector.
Neil Patel SEO Analyzer
A free web-based SEO checker that analyses a website and produces an audit report.
Netcraft Site Report
A free web lookup that shows the hosting, server software and technologies behind any website.
Netpeak Spider
A desktop SEO crawler that audits websites for technical issues.
Nezha
Self-hosted, lightweight dashboard for monitoring servers and websites, with agents and alerts.
Norton Safe Web
Free web service from Norton for looking up the safety reputation of a website.
Nu Html Checker
The W3C's online checker that tests HTML documents against current HTML conformance rules.
Oh Dear
A hosted website health monitor covering uptime, SSL, DNS, cron jobs, broken links and performance.
OneUptime
An open-source platform for uptime monitoring, status pages, incidents, on-call alerting and observability.
OpenGraph.xyz
A web tool that previews how a link looks when shared on social media and generates OG images.
OpenStatus
An open-source status page and uptime monitoring service that you can use hosted or self-host.
OpenText URL/IP Lookup
A web lookup that shows how OpenText threat intelligence, formerly BrightCloud, classifies a URL or IP.
Pa11y
Open-source command-line and dashboard tools that test web pages for accessibility issues automatically.
Pentest-Tools.com
An online toolkit of vulnerability scanners and penetration testing tools that produces customizable reports.
PhishTank
Community-run phishing URL database where you can check, submit and verify suspected phishing sites.
Pingdom Tools
A free online website speed test that reports load time, page size and request count.
Postmark DMARC Digests
Free service that turns a domain's DMARC reports into readable weekly email summaries.
Postmark Spam Check
A free web tool and JSON API that returns the SpamAssassin score of an email message.
Qualys Community Edition
Free, cloud-based edition of the Qualys security platform for asset discovery and vulnerability assessment.
Quttera Website Malware Scanner
Free online scanner that checks a website's public content for malicious scripts and threats.
Readable
An online readability checker that scores text with many readability formulas and highlights passages to fix.
RealFaviconGenerator Favicon Checker
A free web tool that checks whether a site's favicon works across browsers, iOS and Google.
REDbot
Web-based lint tool that checks an HTTP resource for protocol correctness, caching and headers.
Redirect Checker
A free web tool that traces a URL's redirects and reports each status code in the chain.
Report URI
A hosted service that collects and analyses CSP and other browser security reports from your website.
ReqBin
An online tool for sending REST and SOAP API requests directly from the browser.
Request Map Generator
A web tool that draws a node map of every request a page makes, including third parties.
