Website Speed Ranker - Compare how fast your website loads vs your competitors
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Textalyzer - Analyze text readability and SEO parameters
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
SanityCheck - Get the exact data you need from Google Search Console.
Better Uptime - We call you when your website goes down