The best paid alternative to Yahoo! YSlow is Pingdom. If that doesn't suit you, our users have ranked more than 10 alternatives to Yahoo! YSlow and four of them is paid so hopefully you can find a suitable replacement. Other interesting paid alternatives to Yahoo! YSlow are Screaming Frog SEO Spider, Screpy and MachMetrics.
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.
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.
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).
MachMetrics continually monitors the speed of your website. So you know exactly how your pages are performing throughout the day, around the world, and on various devices
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