Free tools

Developer tools

Practical tools for cron schedules, uptime SLAs, and HTTP curl commands. No account required — built by the team behind Crystade monitoring.

Cron Expression Generator

Build a 5-field cron expression, explain it in plain English, and preview the next run times with timezone support.

Open tool

Uptime / SLA Calculator

Convert availability percentages into allowed downtime, or turn an outage duration into an SLA percentage.

Open tool

cURL Builder

Generate a quoted curl command from method, URL, headers, query parameters, auth, and body.

Open tool

Need these numbers in production?

Crystade monitors cron jobs and uptime so missed schedules and SLA burn are caught before customers notice.

Get started free