Free Uptime & Performance Tools
Quick checks for whether a site is up, how fast it responds, and what its uptime really means in real time. No signup required.
Why this matters
Uptime and performance are the two metrics every customer feels first. A site that's down loses sales immediately. A site that's slow loses sales gradually — every extra second of TTFB shaves percentage points off conversion.
These four tools cover the basics in 60 seconds: confirm a URL responds, measure how fast it responds, get a single A+ to F health score across five categories, and translate a vague 'high availability' SLA promise into the actual minutes of allowed downtime per year.
Free tools in this category
Five categories — uptime, SSL, DNS, security headers, performance — combined into a single A+ to F grade.
Use this tool →Check any URL's response code, follow redirects, and inspect response headers.
Use this tool →TTFB, total load time, page size, compression — with a grade and actionable tips.
Use this tool →See what 99.9%, 99.99%, and other SLA levels actually mean in real downtime.
Use this tool →Want continuous monitoring instead of one-off?
Each tool above runs a one-off check. To get alerted whenever something changes, set up a continuous monitor:
The foundational up/down check from the edge with two-confirmation logic. Catches what HTTP Status Checker shows you, but every minute, automatically, with alerts.
Continuous version of Speed Test. Set warn and critical thresholds — be alerted before slow becomes downtime.
Verify a critical button, headline, or copy block is still on the page. Catches the broken-page-with-200-OK failures that pure uptime checks miss.
Alert when page weight balloons unexpectedly — a common cause of TTFB regression after a deploy or a CMS asset upload.
Or browse all 24 monitor types · run a one-off Website Health Score · see all free monitoring tools.