Measure response time, analyze headers, and detect redirects — free, no signup
⚙ Measuring performance...
Instant letter grade based on response time, compression, caching, and size
Precise server response time measurement in milliseconds
Full HTTP response headers including cache, security, and server info
Tracks redirects from original URL to final destination
Identifies web server software, CDN, content type, and response size
Embed a live response time badge in your project README — updates automatically
Integrate performance checks into your CI/CD pipeline or monitoring scripts
Response time is measured server-side from our VPS in Europe. It includes DNS resolution, TCP connection, TLS handshake, and time to first byte (TTFB). Results under 500ms are rated Fast, under 2000ms Moderate, above that Slow.
Yes. The tool follows HTTP redirects (301, 302, 307, 308) and reports both the original URL and final destination, along with the complete redirect chain and total redirect count.
All response headers are displayed, including cache control, content security policy, server software, content type, and any custom headers. This helps identify CDN usage, security configuration, and caching strategy.
Integrate performance monitoring into your scripts or CI/CD pipelines:
curl "https://51-68-119-197.sslip.io/api/perf?url=https://example.com"
import urllib.request, json
url = "https://51-68-119-197.sslip.io/api/perf?url=https://example.com"
data = json.loads(urllib.request.urlopen(url).read())
print(f"Response: {data['response_time_ms']}ms — Rating: {data['rating']}")
const resp = await fetch('https://51-68-119-197.sslip.io/api/perf?url=https://example.com');
const data = await resp.json();
console.log(`${data.response_time_ms}ms — ${data.rating}`);
This free tool is rate-limited. For CI/CD integration, scheduled monitoring, or batch analysis:
Get a Free API Key — 50 requests/day, instant:
RapidAPI PRO/ULTRA — up to 60 req/min, from $9.99/mo: