Cron As A Service is described as 'Online cron job scheduler with a beautifully simple interface so you can worry about building your app. Cron As A Service allows you to schedule regular HTTP requests to your webapp'. There are eight alternatives to Cron As A Service, not only websites but also apps for a variety of platforms, including Linux, Looper, Webcron and Mac. The best alternative is crontab guru, which is both free and Open Source. Other great sites and apps similar to Cron As A Service are crontab (Free, Open Source), EasyCron (Freemium), Looper (Paid) and Webcron (Paid).
An easy to use editor for crontab schedules. Cron job failures can be disastrous! We created Cronitor because crontab itself can't alert you if your jobs fail or never start. With easy integration and instant alerts when things go wrong, Cronitor has you covered.
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.
Cronicle is a multi-server task scheduler and runner, with a web based front-end UI. It handles both scheduled, repeating and on-demand jobs, targeting any number of slave servers, with real-time stats and live log viewer.