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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.

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.

Start monitoring freeSee how it works

Free for up to 50 monitors · Setup in 60 seconds · No credit card required