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View Web Vitals metrics for the websites you visit and quickly navigate to external web performance testing tools. View Web Vitals metrics for the websites you visit and quickly navigate to external web performance testing tools. The extension also shows the observed metrics collected by PageSpeed Insights prior to applying the throttling simulation. This can help you interpret the final reported metrics. The extension shows the following metrics: - Full TTFB - First Contentful Paint - Largest Contentful Paint - Cumulative Layout Shift / CLS - First Input Delay (only after user interaction with the current page) - Interaction to Next Paint (only after user interaction with the current page) The "View on DebugBear" link is shown to users logged into the DebugBear monitoring tool.
CLS Visualizer
Visualizer the CLS of any webpage This plugin will highlight and visualize the Cumulative Layout Shift. Cumulative Layout Shift (CLS) is an important, user-centric metric for measuring visual stability because it helps quantify how often users experience unexpected layout shifts—a low CLS helps ensure that the page is delightful. Unfortunately the CLS is a pain to debug without visualisation
SiteSpeed Checker
Displays page load speed using Google PageSpeed Insights API Site Speed Checker is a powerful SEO Chrome extension that helps you measure the loading speed of any website. With Site Speed Checker, you can quickly determine how fast a website loads, and identify any issues that may be slowing it down. 1. Measure the loading speed of any website with just one click 2. See detailed information about the website's loading time, including the time to first byte, total load time, and more 3. Identify any issues that may be slowing down the website, such as large images or slow server response times 4. Compare the loading speed of different websites to see how they stack up against each other 5. Use the extension to optimize your own website's loading speed and improve user experience Whether you're a website owner, marketer, or developer, Site Speed Checker is an essential tool for optimizing website loading times and providing a better experience for your users. Try it today and see how it can improve your website's performance!
Core Web Vitals Visualizer
Measure, visualize, and debug Core Web Vitals in real time. CrUX history, LCP/CLS/INP breakdowns and performance experiments Core Web Vitals Visualizer Open the popup on any page. See your LCP, CLS, INP, FCP, and TTFB scores instantly, color-coded, live. No separate tool. No copy-pasting URLs into PageSpeed Insights. What it shows Real-time scores powered by the web-vitals library, the same library Chrome uses internally. Green means good. Orange means work to do. Red means it's hurting you. LCP - Green overlay marks the LCP element on the page. Full timing breakdown: TTFB, Resource Load Delay, Resource Load Duration, Element Render Delay. For images: preload status, fetchpriority, 1st vs 3rd party origin, natural vs rendered dimensions, estimated preload savings. CLS - Pink overlays mark every layout shift source. Click any shift to see an animated before/after replay. Attribution shows the largest shift target and score. INP - Broken down into Input Delay, Processing Duration, and Presentation Delay. Shows interaction type, target element, and page load state at time of interaction. FCP and TTFB - -FCP splits into Time to First Byte vs First Byte to FCP. TTFB splits into Cache, DNS, Connection, Request, and Waiting. CrUX history 25 weeks of Chrome User Experience Report data for any site or URL. Toggle between P75 scores and good/needs-improvement/poor distributions. Switch between mobile and desktop. Trend lines show whether each metric is moving in the right direction. Render-blocking resources Every render-blocking stylesheet and script listed with individual file timings and total blocking duration. Performance experiments Test fixes without touching your code. Disable JS, defer all JS, or block third-party JS. Lazy load images, de-prioritize background images, disable web fonts or third-party CSS. Run any experiment with cache cleared to measure real cold-load impact. Network throttling Simulate slow 3G with CPU throttling. Clear cache and reload to measure cold performance. Built for developers Minimal permissions. No data collection. Everything runs locally. All vitals logged to the console for debugging. One-click links to CrUX Dashboard, PageSpeed Insights, and the W3C HTML Validator for the current page. changes: 1.19 New Signal scan and minor fixes 1.18 Fixed INP attribution logic 1.17 Redesign of Experiments and new Audit tab, Minor logic an UI fixes 1.16 Added content audit, refactored experiments and minor layout improvements 1.15 Minor fixes 1.14 Added Treo.sh link, removed depricated looker studio report, added crux lcp subparts, rtt. navigation types and lcp types 1.13 Added CrUX Vis link, better fallback for missing CrUX data and small bigfixes. 1.12 Better messaging + improved elementtiming, better logging to console 1.11 Removed the FID, the Web Vitals are now based upon the upcoming v4 of the web vitals library, new breakdown details, improved CSS visualization, small bugfixes, code cleanup. 1.10 Promote INP to a Core Web Vitals and demote FID to a metric of interest! 1.9 CrUX history API, small fixes, more CLS info 1.8 Better metric updates, better logging, minor improvements 1.7 Log Events, Long Tasks and Long Animation Frames to the console that happen during and might interfere with the INP. 1.6 Better INP Breakdown, minor code improvements. 1.5 code improvements, layout improvements, added page experiments (defer javascript, disable javascript, disable third party scripts, lazy load images, defer background images & disable webfonts). 1.4 left side menu, more information about render blocking resources and direct links to PSI, CrUX dashboard and W3C. 1.2 added lots of LCP information like preloading, fetchpriority, rendering breakdown, first or third party etc.
Checkbot: SEO, Web Speed & Security Tester 🚀
Checkbot is a powerful website testing tool that tells you how to improve the SEO, page speed and security of your website. Checkbot crawls 100s of pages at the same time checking for 50+ common website problems based on web best practices recommended by Google and Mozilla. These checks include: 📊 SEO TESTS: Broken link checker, missing or long page titles/descriptions/headings, duplicate page content, HTML/CSS/JavaScript validator, canonical URLs, image ALT tags, robots.txt, URL naming, mobile friendly pages, deprecated web features, 404 pages, meta tags, temporary/meta redirects, thin pages & sitemap setup. 🚀 PAGE SPEED TESTS: Minification, network compression, resource caching, render blocking or duplicate CSS/JavaScript, excessive inlining of CSS/JavaScript, redirecting URLs & redirect chains. 🔒 WEB SECURITY TESTS: Security headers, HTTPS and mixed content checker, HSTS with preloading, content sniffing, iframe restrictions & password forms security. See https://www.checkbot.io/guide/ for the 50+ web best practices Checkbot will test for you to help make your site faster, more secure and rank higher in search results. 🏆 HubSpot, Best Chrome Extensions 2021 - "Checkbot combines technical SEO with modern security to help you analyze both how safe and how optimized a website is for search engines" https://blog.hubspot.com/marketing/best-chrome-extensions 🏆 Einstein Marketer, "11 Must-Have Google Chrome Extensions (for Marketers, Entrepreneurs and Businesses)...If you own a website, this Chrome extension is going to help you supercharge your load speed, rank higher in Google and improve the security" https://www.einsteinmarketer.com/chrome-extensions-marketers/ 🏆 Product Hunt, #3 Product of the Day award https://www.producthunt.com/posts/checkbot-for-chrome The free version lets you check unlimited small websites as often as you want but you need to upgrade to run website audits with these features: - Advanced crawl settings to exclude pages by URL pattern, type, folder and subdomain See https://www.checkbot.io/#pricing for more. Follow Checkbot for updates: Visit https://www.checkbot.io/faq/ for support, answers to frequently asked questions and to give feedback. Checkbot will ask for the "Read and change all your data..." permission for the sole purpose of crawling and testing the websites you ask Checkbot to check. This is currently the most restrictive permission we can ask for that allows this and Google has also reviewed this extension to check it follows best practices on requesting permissions. Your regular browsing will be unaffected: Checkbot does not observe or modify anything outside of the Checkbot tab. If you still have concerns, you can opt to create a new Chrome user profile to install Checkbot inside of to isolate it from your regular browsing.
