Free Tools for Web Performance

Quick, no-signup utilities from the team behind Loadster. Built for developers and site owners who want straight answers about their site's performance.

Website Speed Test

Measure real Chrome page-load timing from the cloud region of your choice. TTFB, FCP, LCP, the full request waterfall, and response headers. Free, no signup.

Run a speed test →

Uptime & SLA Calculator

Turn an SLA like 99.9% into allowed downtime per day, month, and year, convert outages into an uptime percentage, combine the availability of your dependencies, and estimate what downtime costs.

Calculate downtime →