About cronwell

cronwell takes a cron expression, explains what it does, shows the next five times it will fire in any timezone, and rewrites it for Unix cron, GitHub Actions, Kubernetes CronJob, Quartz, AWS EventBridge and systemd OnCalendar — handling seconds/year fields, the Sunday=0 vs 1 difference, and the Quartz/AWS “?” rule.

The schedule math and conversions run as pure functions in your browser — no backend, no account, nothing sent anywhere. When a conversion can’t be expressed exactly, cronwell tells you.