TechUtilityTools

API Response Time Checker

Time a real HTTP request to any endpoint and see the average, fastest, and slowest of five back-to-back samples.

What's next
Configure
Monitor this automatically

Get alerts when uptime, latency, or DNS changes.

Open history
Save this check

Keep unlimited history across devices.

View trends
Track performance over time

See trends, regressions, and outage windows.

Monitor API endpoints continuously

Pro pings your endpoints on a schedule and alerts when latency spikes.

Configure monitor
Next diagnostic steps
DNS lookup

Slow first byte? Check resolution time.

Server status

Confirm the host itself is healthy.

Speed test

Rule out your local connection.

How it works

  1. 1
    Five sequential requests

    We hit the endpoint five times to smooth out single-request variance.

  2. 2
    Round-trip measured

    Timing includes DNS, TLS, request, and response — exactly what your users experience.

  3. 3
    CORS-safe fallback

    If the API blocks browser CORS, we still measure round-trip via opaque requests.

Real use cases

  • — Compare staging vs production endpoint latency.
  • — Validate a CDN or caching layer is doing its job.
  • — Diagnose an intermittent slow API before opening a vendor ticket.
  • — Benchmark before and after a backend deploy.

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Runs entirely in your browser. Nothing is sent to our servers.