ApiChecker is described as 'is reliable uptime and performance monitoring for your service. It uses different servers around the world to verify your service/API/WebSite performance and uptime ?!' and is a Website Monitor in the Network & Admin category. There are more than 100 alternatives to ApiChecker for a variety of platforms, including Online / Web-based, Windows, SaaS, Linux and Mac. Most alternatives are Website and Uptime Monitors. The best alternative is UptimeRobot, which is free. Other great apps like ApiChecker are Pingdom (Paid), Freshping (Free), PHP Server Monitor (Free, Open Source) and Cabot (Free, Open Source).
Unlimited monitors checked from multiple location every minute. Monitor any port or setup a "heartbeat" that works well for cron jobs or any service behind a firewall. Be alerted as soon as your service is offline via email or app integration.
StablePing is a fully managed uptime monitoring service for just $3.95/month. Whenever your website goes down, their system will alert you within seconds via email or SMS (and they'll work with you to get it back online).
WebGazer is a website and cron monitoring service. We check if your website and REST APIs are up, and notify you if anything goes wrong. You could also send periodic HTTP requests at the end of cron jobs or scheduled tasks to monitor.