Free
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Free tools for developers
Calculators and checks we built for our own on-call work: no signup, no ads.
SLA & Uptime Calculator
Turn any uptime % into allowed downtime, and back.
Cron Expression Generator
Build and validate cron schedules with next-run previews.
Cron Translator
Paste a cron expression, get plain-English.
Is My Website Down?
One-click HTTP, SSL, DNS and speed check.
Is It Down?
Live, independently checked status for GitHub, npm, Vercel, Stripe, the OpenAI API and more.
Built by a monitoring company
When you're done calculating, let us watch it for you.
Drumbeats monitors uptime, cron jobs, and background workers with sub-minute checks and instant alerts: free for up to 50 monitors.
Free for up to 50 monitors · Setup in 60 seconds · No credit card required