About crontools.dev

I built crontools because I kept hitting the same wall every time I had to write a non-trivial cron expression. crontab.guru is great for "every five minutes," but the second I needed AWS EventBridge syntax with its weird ? rule, or a Quartz expression with L and #, or a GitHub Actions schedule and I wanted to see the next run in my own timezone — I was juggling three tabs and a calculator.

So this site does the whole thing in one place. Visual field pickers, natural-language input both ways, next-run previews for nine different platforms, and a copy-pasteable manifest snippet (K8s YAML, GitHub Actions workflow, Spring annotation, etc.) for whatever you're actually shipping. All parsing happens in your browser — no expression you type ever leaves your machine.

If a platform's syntax is wrong, an example doesn't decode the way you'd expect, or you want to see another scheduler added, let me know. The contact page has an email — I read it.