Tools
Free tools for software reliability work.
Calculate downtime, understand cron schedules, verify webhook signatures, and prepare a status page without creating an account.
Uptime calculator
Convert an uptime percentage into allowed downtime for 24 hours, 30 days, a year, or a custom window. Runs in your browser.
Webhook signature generator and verifier
Generate or verify HMAC SHA-256 webhook signatures in your browser. Secrets never leave the device.
Cron expression explainer
Explain a 5-field cron expression and show upcoming UTC run times. No commands are executed.
Status-page readiness checklist
Interactive checklist for ownership, components, incidents, maintenance, subscribers, and testing. Not a certification.