Website Checker Tech - WebsiteChecker.Tech is SaaS tool that detects SEO and availability issues of your website, making it easier for you to fix them.
Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
WebGazer - Monitor your website's availability with WebGazer, review its performance and get instant notifications when your website goes down. No installation required and free plan available.
Sitechecker - All-in-one SEO platform including rank tracker, website SEO audit tool and website changes monitoring. Detailed reports by 100+ parameters with how-to-fix guides.
Checkify - Super minimal, simple and inexpensive 24/7 uptime monitoring