Yahoo! YSlow is described as 'YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. YSlow is a Firefox add-on integrated with the Firebug web development tool' and is an app in the web browsers category. There are more than 25 alternatives to Yahoo! YSlow for a variety of platforms, including Web-based, SaaS, Google Chrome, Mozilla Firefox and Slack apps. The best Yahoo! YSlow alternative is Google Lighthouse, which is both free and Open Source. Other great apps like Yahoo! YSlow are Pingdom, Screaming Frog SEO Spider, PageSpeed Insights and GTmetrix.
Lighthouse is an open-source, automated tool for improving the quality of web pages. You can run it against any web page, public or requiring authentication. It has audits for performance, accessibility, progressive web apps, SEO and more.
United States
Tracks uptime, downtime, and page speed with synthetic and real user monitoring, simulates critical flows, analyzes visitor data by location, device, and browser, sends instant alerts, and provides analytics and reporting to troubleshoot and optimize sites.
United States
The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links, images, CSS, script and apps from an SEO perspective.
United Kingdom
PageSpeed Insights (PSI) reports on the performance of a page on both mobile and desktop devices, and provides suggestions on how that page may be improved.
United States
GTmetrix is a free tool that analyzes your page's speed performance. Using Page Speed and YSlow, GTmetrix generates scores for your pages and offers actionable recommendations on how to fix them.
Canada
Run a free website speed test from around the globe using real browsers at consumer connection speeds with detailed optimization recommendations.
United States
France
EU
Use this free Website Speed Test to analyze the load speed of your websites, and learn how to make them faster.
United States
Screpy is an AI-based web analysis tool that can analyze all pages of your websites in one dashboard and monitor them with your team. It's powered by Lighthouse and it also includes some different analysis tools (SEO, SERP, W3C, Uptime, etc).
Get the web's modern capabilities on your own sites and apps with useful guidance and analysis from web.dev.
United States
Domsignal is an all-in-one platform dedicated to empowering developers, SEO experts, sysadmins, and security researchers in their quest for website excellence. We provide a comprehensive suite of tools to help you analyze and optimize your website's performance, security...
United Kingdom
