collectWhat is collected
No accounts, no advertising, no cookies. Analytics: none — there is no analytics script on this site.
expressionsCron expressions
Expressions are parsed in your browser. They are never transmitted, not logged and not stored. A cron tool that could read the schedules you are testing would learn exactly which jobs run in which company, so this one cannot.
urlThe address bar
The expression and the timezone are written into the page URL as ?cron= and tz= so a schedule can be bookmarked or shared, and so a reload does not lose your work. Those values stay in your browser history like any other URL — do not paste a URL containing a sensitive schedule anywhere you would not paste the schedule itself.
hostingHosting
The site is served as static assets from a content delivery network. As with any web request, the network sees your IP address and user agent in order to answer the request.