Everything You Need to Monitor APIs
Professional tools for API performance testing, monitoring, and optimization.
Response Time Checker
Measure exact API response times with DNS lookup, TTFB, and total latency breakdown.
Bulk API Testing
Test multiple API endpoints simultaneously and compare their performance.
Uptime Monitoring
Monitor your API endpoints 24/7 and get instant alerts when downtime occurs.
Beautiful Charts
Visualize API performance with interactive line charts, heatmaps, and distribution graphs.
Export Reports
Export your API test results as CSV, JSON, or professional PDF reports.
Developer Utilities
JSON formatter, JWT decoder, Base64 encoder, HTTP header viewer, and more.
How It Works
Get detailed API performance metrics in 4 simple steps.
Enter Your API URL
Paste any REST, GraphQL, or WebSocket endpoint URL
Configure Request
Select method, add headers, and set body payload
Run & Analyze
Get instant results with detailed latency breakdown
Optimize & Monitor
Use insights to improve performance and set up monitoring
Developer Utilities
Extra tools to supercharge your API development workflow.
Loved by Developers
“The fastest and cleanest API response checker I've ever used. Saved us hours of debugging.”
“We use this tool daily to monitor our microservices. The bulk testing feature is a game changer.”
“Finally, an API tool that doesn't require signup. Fast, free, and beautifully designed.”
From the Blog
Expert guides and tutorials on API performance optimization.
Why Choose API Timing for Your API Testing?
Most API testing tools require creating an account, entering payment information, or dealing with complex configuration. We believe performance testing should be instant and accessible. Our platform requires zero registration and is completely free, with no hidden limits or premium tiers.
Every tool on our site runs real requests from your browser to the target server. We do not store your API keys, request data, or test results. Your privacy is built into the foundation of our platform.
We cover the complete API testing workflow: individual endpoint testing with detailed latency breakdowns, bulk testing for comparing multiple endpoints, continuous uptime monitoring, SSL certificate validation, and DNS record inspection. All tools are designed with a consistent, intuitive interface so you can switch between them seamlessly.
Whether you are debugging a slow endpoint, verifying a deployment, setting up monitoring for a production service, or learning about HTTP fundamentals, our tools give you the data you need to make informed decisions about your API performance.