API Response Time Comparator
Compare API response time across multiple endpoints. Run parallel requests and compare latency, status codes, and payload sizes visually. Free online tool.
Endpoints
Results & Waterfall
Add endpoints and click Run to compare.
What is the API Response Time Comparator?
Compare API endpoints side by side. Test parallel requests, latency, status codes, and payload sizes. Built for optimal performance, this tool executes client-side directly in your browser without uploading your sensitive data to external servers.
How to use the API Response Time Comparator
- Enter two HTTP API endpoint URLs to test side-by-side.
- Set optional HTTP request headers, query parameters, or payload bodies.
- Click 'Compare Endpoints' to dispatch parallel requests and measure latency metrics (DNS, TLS, TTFB, Total Duration).
- Examine the comparison table showing millisecond response times, HTTP status codes, and payload sizes.
Example: Comparing Regional CDN Latency
API 1: https://api.us-east.example.com/health API 2: https://api.eu-central.example.com/health
API 1: 42ms (TTFB: 38ms) | API 2: 128ms (TTFB: 121ms) | Winner: API 1 (3x faster)
Benchmarking endpoint performance to verify CDN cache hits and routing optimizations.
Technical Guide & Privacy Assurance
Run tests multiple times to account for cold starts and internet jitter. Look at median response times rather than single outlier requests.
Frequently Asked Questions
How do I compare API response times?+
Enter multiple API endpoints and click test. The tool runs requests in parallel and displays a side-by-side comparison of response times, payload sizes, and status codes.