In this post I’m comparing cron monitoring features of four services: Cronitor, Healthchecks.io, Uptime Robot, Sentry. How I picked the services for comparison: I searched for “cron monitoring” on Google and picked the top results in their order of appearance. Disclaimer: I run Healthchecks.io, so I’m a biased source. I’ve tried to get the facts right, but choosing what features to compare, and what differences to highlight, is of course subjective.