OKchecker is described as 'Simple website uptime and cron job monitoring. We check operational status of your website and notify you when your server is not responding or your nightly backups, weekly reports and scheduled tasks don't run on time' and is a Uptime Monitor service in the network & admin category. There are three alternatives to OKchecker, not only websites but also apps for a variety of platforms, including Android, Self-Hosted, Ruby and Python apps. The best OKchecker alternative is Sentry, which is free. Other great sites and apps similar to OKchecker are New Relic and Rollbar.