Request Metrics is described as 'Unified Web Performance that automatically tests your pages and tracks real user experiences. Automatically discovers your busiest pages and scans them weekly, providing actionable recommendations. Integrated Real User Monitoring to track the actual experience of visitors to' and is a website monitoring tool in the development category. There are more than 25 alternatives to Request Metrics for a variety of platforms, including Web-based, SaaS, Self-Hosted, Google Chrome and Mac apps. The best Request Metrics alternative is Pingdom. It's not free, so if you're looking for a free alternative, you could try Google Lighthouse or GTmetrix. Other great apps like Request Metrics are Screaming Frog SEO Spider, PageSpeed Insights, WebPageTest and PageVitals.
wattspeed is a dev-time snapshot tool. Request Metrics is a run-time monitoring tool.