Free Tools
Tools for developers and SREs.
Calculators, references, and guides. No signup required.
CHECKERS
Response Time Checker
Test your site from multiple global probe locations. See DNS, TCP, TLS, and TTFB breakdown for each.
SSL Certificate Checker
Check your SSL certificate details: expiry, issuer, TLS version, and cipher suite.
DNS Propagation Checker
Check if your DNS changes have propagated across major public resolvers.
CALCULATORS
Monitor your uptime for real.
Larm uses multi-probe voting to eliminate false alerts. Checks from multiple global locations, alerts only when it's real. Free to start.
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