CronBlast is described as 'Web Crons, Uptime Alerts, Performance Reports. Choose the URL of your script and choose a frequency to run. (i.e, every minute, hour, etc)' and is an website. There are four alternatives to CronBlast, not only websites but also apps for SaaS, Windows, Linux and Mac. The best alternative is EasyCron, which is free. Other great sites and apps similar to CronBlast are WebGazer, Beew.io and Zen Cron.