This tool gives you
This free website speed test checks response time and estimated TTFB for any URL, with a fast-or-slow verdict graded against Google's thresholds. No signup, no benchmark history.
Postman Monitors gives you
Postman Monitors turns that single check into response-time trends over time, so you can tie a regression to the deploy that caused it,
continuous scheduled monitoring with alerts when response time crosses a threshold you set, multi-region measurement from Postman's global regions, and a Postman CLI check that fails your build on a regression.
Why did my score change when I didn't touch anything?
Response time and TTFB fluctuate with network conditions, server load, and CDN caching — a small swing between checks is normal, not a regression.
Is my TTFB or speed score actually good or bad?
The verdict is graded against Google's published thresholds, so "fast" or "slow" reflects the same bar Core Web Vitals uses.
What is TTFB and why does it matter for site speed?
Time to first byte measures how long the server takes to start responding — it isolates backend and network delay from rendering time.
Can I track my website's performance over time, not just check it once?
Yes —
Postman Monitors runs this same check on a schedule and keeps a history of response time so you can catch regressions early.
Can I fail my CI build if my site's response time regresses?
The Postman CLI can run this check in your pipeline and fail the build when response time crosses a threshold you set.
Is there a quick website health check I can run before a launch?
This speed test plus the uptime and API health checkers cover a fast pre-launch pass without any setup.
Can I check API response time too, not just websites?
Yes — this tool measures response time and TTFB for any URL, including an API endpoint, not just a webpage. This is actually where Postman's monitoring goes further: Postman Monitors can assert on the real response body of an API — not just confirm it responded fast — across every endpoint you care about.