Sites and apps similar to relay19 include UptimeRobot, which has a free version. Other options are Pingdom, StatusCake, Pulsetic and Uptime.com. In total there are nine Uptime Monitor Services like relay19 for Android, iPhone, iPad, Chrome OS and Mac.
Free real-time monitoring for 50 sites every 5 minutes. Custom alerts through email, SMS, calls, and apps like Slack, PagerDuty, and more. Use status pages and mobile apps for easy management.
Slovakia
EU
Tracks uptime, downtime, and page speed with synthetic and real user monitoring, simulates critical flows, analyzes visitor data by location, device, and browser, sends instant alerts, and provides analytics and reporting to troubleshoot and optimize sites.
United States
Provides uptime, performance, and page speed monitoring for up to 10 websites. Offers customizable alerts by email, SMS, or third-party apps, root cause analysis, mobile support, server and SSL checks, plus a free plan with detailed reports for diagnostics.
United Kingdom
Receive detailed website downtime alerts by phone, SMS, email, or Slack, monitor uptime and performance in real time from global data centers, avoid false positives, create customizable status pages, generate incident management and performance reports.
Ukraine
Real-time monitoring with checks every minute from over 30 global locations, alerts for outages or slowdowns, detailed uptime and response time reports, customizable alerts, public status pages, SSL and domain monitoring, and REST API for automation.
United States
NodePing Server Monitoring and Web Site Monitoring. Simple but powerful Internet service monitoring. Checks as frequent as once a minute.
United States
WebsitePulse.io checks your website around the clock and tells you the moment something breaks, by email or WhatsApp.
United Kingdom
Uptime Monitor: Start monitoring in less than 30 seconds. Free Monitoring Robot for Uptime of your website, keyword, cronjob, port. Get notified by by phone, voice, email, sms and more. Website Uptime Monitor, Keyword monitor, Network uptime monitor, Cron monitor, Job monitor
Monitoria is an active monitoring service you can use to monitor your website or basically any HTTP(S) endpoint. It will periodically send requests to the selected URL, and when it starts receiving errors, it will send you a notification.
