WebGazer
UptimeRobot
Pingdom
StatusCake
updown.io
Cronitor
RapidSpike
Hyperping
api-usage
WebGazer is an uptime monitoring platform that checks if your website is up as it should be and notifies you if anything goes wrong
WebGazerUptimeRobot - Free Website Uptime Monitoring
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.
StatusCake - Website Uptime Monitoring & Alerts โ Free Unlimited Downtime Monitoring
updown.io - updown.io is a HTTP(S)/TCP/ICMP monitoring service which checks periodically the URL you want and reports back any anomaly.
Cronitor - Monitor cron jobs, micro-services, daemons and almost anything else, no setup required. Easier cron troubleshooting and no more silent failures.
RapidSpike - RapidSpike is a reliability, performance and security monitoring service for transactional websites. Using next-generation synthetic monitoring & deeper than ever before data, RapidSpike is for businesses serious about protecting their online revenue