37audits.com

# 37 Audits - Website Audit Platform

> 37 Audits is a comprehensive website audit platform that provides automated checks for SEO, security, performance, accessibility, and resilience issues. The platform helps businesses find and fix website problems before they cost rankings, revenue, or trust.

## Checkers

- [Browser Console Messages Checker](https://www.37audits.com/checkers/browser-console-messages-checker): Detects JavaScript errors and console messages
- [Cache Checker](https://www.37audits.com/checkers/cache-checker): Validates cache headers for optimal web performance
- [CDN Coverage Checker](https://www.37audits.com/checkers/cdn-coverage-checker): Checks if your website content is served through a CDN
- [Certificate Expiration Checker](https://www.37audits.com/checkers/certificate-expiration-checker): Validates SSL certificate validity and expiration status
- [Content Encoding Checker](https://www.37audits.com/checkers/content-encoding-checker): Validates content compression for performance optimization
- [Content Security Policy Checker](https://www.37audits.com/checkers/csp-checker): Validates Content-Security-Policy header configuration
- [Cookie Checker](https://www.37audits.com/checkers/cookie-checker): Validates cookie security attributes and configuration
- [Cookie Consent Checker](https://www.37audits.com/checkers/cookie-consent-checker): Checks for proper cookie consent banners with accept/reject options
- [CSR/SSR Checker](https://www.37audits.com/checkers/csr-ssr-checker): Detects if website uses Client-Side or Server-Side Rendering
- [CVE Checker](https://www.37audits.com/checkers/cve-checker): Scans software stack for known security vulnerabilities
- [DNS Mail BIMI Checker](https://www.37audits.com/checkers/dns-mail-bimi-checker): Validates BIMI for brand authentication in emails
- [DNS Mail DKIM Checker](https://www.37audits.com/checkers/dns-mail-dkim-checker): Validates DKIM signatures for email authentication
- [DNS Mail DMARC Checker](https://www.37audits.com/checkers/dns-mail-dmarc-checker): Validates DMARC policy for email authentication
- [DNS Mail MTA-STS Checker](https://www.37audits.com/checkers/dns-mail-mta-sts-checker): Validates MTA-STS for secure email transmission
- [DNS Mail MX Checker](https://www.37audits.com/checkers/dns-mail-mx-checker): Validates MX records for proper email routing
- [DNS Mail SPF Checker](https://www.37audits.com/checkers/dns-mail-spf-checker): Validates SPF records to prevent email spoofing
- [DNS Mail TLS-RPT Checker](https://www.37audits.com/checkers/dns-mail-tls-rpt-checker): Validates TLS-RPT for email security monitoring
- [Domain Expiration Checker](https://www.37audits.com/checkers/domain-expiration-checker): Monitors domain expiration dates via RDAP to prevent service disruption
- [FAQ Checker](https://www.37audits.com/checkers/faq-checker): Detects FAQ pages using schema markup and content analysis
- [Google Analytics Checker](https://www.37audits.com/checkers/google-analytics-checker): Validates Google Analytics gtag.js implementation and configuration
- [Google Tag Manager Checker](https://www.37audits.com/checkers/google-tag-manager-checker): Validates Google Tag Manager implementation and configuration
- [Heading Structure Checker](https://www.37audits.com/checkers/heading-structure-checker): Validates HTML heading hierarchy and structure
- [HSTS Preload Checker](https://www.37audits.com/checkers/hsts-preload-checker): Validates HSTS preload header configuration
- [HTTP Redirect Checker](https://www.37audits.com/checkers/http-redirect-checker): Validates HTTP to HTTPS redirect configuration
- [HTTP Version Checker](https://www.37audits.com/checkers/http-version-checker): Detects supported HTTP protocol versions
- [Image Alt Checker](https://www.37audits.com/checkers/image-alt-checker): Validates image alt attributes for accessibility compliance
- [Large Resource Checker](https://www.37audits.com/checkers/large-resource-checker): Detects oversized resources affecting page performance
- [Latest Version Checker](https://www.37audits.com/checkers/latest-version-checker): Validates software stack version against latest releases
- [LLMs.txt](https://www.37audits.com/checkers/llms-txt-checker): Validates llms.txt files for AI-friendly content optimization
- [Lorem Ipsum Checker](https://www.37audits.com/checkers/lorem-ipsun-checker): Detects placeholder text that should be replaced
- [Meta Description Length Checker](https://www.37audits.com/checkers/meta-description-length-checker): Validates meta description length for optimal SEO performance
- [Minifier Checker](https://www.37audits.com/checkers/minifier-checker): Checks if web resources are minified for optimal performance
- [Mixed Content Checker](https://www.37audits.com/checkers/mixed-content-checker): Detects HTTP resources on HTTPS pages and CSP upgrade directive
- [Not Found Checker](https://www.37audits.com/checkers/not-found-checker): Checks 404 page implementation and SEO best practices
- [OpenGraph Checker](https://www.37audits.com/checkers/opengraph-checker): Validates OpenGraph meta tags for social media sharing
- [Page Title Checker](https://www.37audits.com/checkers/page-title-checker): Validates page title length and SEO optimization
- [Permissions Policy Checker](https://www.37audits.com/checkers/permissions-policy-checker): Validates Permissions-Policy header for secure browser feature controls
- [Pricing Checker](https://www.37audits.com/checkers/pricing-checker): Detects pricing and subscription plan pages on websites
- [Protected URL Checker](https://www.37audits.com/checkers/protected-url-checker): Validates sensitive URLs return proper HTTP status codes (401/403/404) 
- [Referrer Policy Checker](https://www.37audits.com/checkers/referrer-policy-checker): Validates Referrer-Policy header for privacy protection
- [Robots Crawl Delay Checker](https://www.37audits.com/checkers/robots-crawl-delay-checker): Validates robots.txt crawl-delay directive presence
- [Schema Entities Checker](https://www.37audits.com/checkers/schema-entities-checker): Validates Schema.org structured data implementation
- [Server Fingerprint Checker](https://www.37audits.com/checkers/server-fingerprint-checker): Checks for server info disclosure in HTTP headers
- [Sitemap Checker](https://www.37audits.com/checkers/sitemap-checker): Validates XML sitemap availability and freshness
- [Time To First Byte Checker](https://www.37audits.com/checkers/ttfb-checker): Measures website response time performance
- [TLS Version Checker](https://www.37audits.com/checkers/tls-version-checker): Checks TLS protocol versions for security vulnerabilities
- [Twitter Card Checker](https://www.37audits.com/checkers/twitter-card-checker): Validates Twitter Card meta tags for social media sharing optimization
- [X-Content-Type-Options Checker](https://www.37audits.com/checkers/x-content-type-options-checker): Validates X-Content-Type-Options header for MIME sniffing protection
- [X-Frame-Options Checker](https://www.37audits.com/checkers/x-frame-options-checker): Validates X-Frame-Options header for clickjacking protection

## Resources

- [Checkers](https://www.37audits.com/checkers): Full catalog of website audit checkers.
- [Blog](https://www.37audits.com/blog): Articles covering website audit best practices, tutorials, and SEO/performance/security guides.
- [Pricing](https://www.37audits.com/pricing): Plans and credit pricing for running audits.
- [Dogfooding](https://www.37audits.com/dogfooding): Live audit results for 37audits.com itself.

## Blog Posts

- [How Midnight Fire Drills Inspired Me to Build 37 Audits](https://www.37audits.com/blog/how-midnight-fire-drills-inspired-me-to-build-37-audits): Moments of crisis led me to build 37 Audits: a platform that proactively detects issues before they become costly outages or reputational disasters. This post shares the real-world origin story behind the tool — and how moving from reactive to proactive monitoring became a game changer for me and my clients.
- [SSL Certificate Expiration: The Silent Website Killer](https://www.37audits.com/blog/ssl-certificate-expiration-silent-killer): Learn why SSL certificate expiration is one of the most common yet preventable causes of website outages. Discover the warning signs and how to protect your business.
- [The Hidden Costs of Website Downtime: A Customer's Nightmare](https://www.37audits.com/blog/hidden-costs-website-downtime): Discover how unexpected website outages can devastate customer trust, revenue, and brand reputation. Learn from real-world examples of businesses that lost millions due to poor monitoring.
- [Performance Monitoring: Why Page Speed Kills Conversions](https://www.37audits.com/blog/performance-monitoring-page-speed-conversions): Explore the direct correlation between website performance and business success. Learn how slow loading times are costing you customers and revenue every day.
- [The Great CDN Failure: When Global Infrastructure Lets You Down](https://www.37audits.com/blog/great-cdn-failure-global-infrastructure): A deep dive into how CDN outages can bring down thousands of websites simultaneously. Learn from major incidents and discover how to build resilience into your monitoring strategy.
- [JavaScript Errors: The Silent Conversion Killers Hiding in Your Code](https://www.37audits.com/blog/javascript-errors-silent-conversion-killers): Uncover how client-side JavaScript errors are secretly destroying your user experience and conversion rates. Learn to detect, monitor, and fix these invisible problems.