What are some alternatives?
When comparing Site24x7 and Datadog, you can also consider the following products
LogicMonitor - LogicMonitor is the SaaS performance monitoring platform for the world's best IT teams. Deploy Fast, Monitor More, Improve Ops.
Pulseway - Pulseway changes the enterprise monitoring and management game with its mobile management solution.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
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.
Sumo Logic - Sumo Logic is a secure, purpose-built cloud-based machine data analytics service that leverages big data for real-time IT insights
UptimeRobot - Free Website Uptime Monitoring