Performance testing
API load testing tool
Simulate concurrent users against your HTTP APIs. Measure latency percentiles, error rates, and throughputwithout writing k6 or JMeter scripts.
- Visual load test configuration
- Real-time charts during the run
- Up to 1,000 concurrent users on Pro
- Export results for stakeholders
Free tier available. No credit card required to start.
Load test APIs without scripts
Point at an endpoint, set virtual users and duration, and start the test. API Test Lab handles request generation and aggregates metrics for you.
- Ramp-up and steady-state profiles
- p50, p95, p99 latency tracking
- Error rate and throughput graphs
- Stop tests early if thresholds breach
Same account as functional API tests
Debug a slow endpoint in the Test Lab, fix it, then run a load test on the same saved requestno export/import between tools.
- Reuse saved requests as load targets
- AI summary of performance bottlenecks
- Compare runs over time in dashboard
- Free tier includes limited load tests
Request builder that stays out of your way
Compose GET, POST, PUT, PATCH, and DELETE requests with headers, query params, JSON bodies, and auththen inspect status, timing, and formatted JSON responses.
- Bearer, API key, and Basic auth in the UI
- Environment variables for staging vs production
- Save requests into collections and folders
- Export as cURL, Python, or fetch snippets
Comparisons
See how API Test Lab stacks up against Postman and other tools
Frequently asked questions
Quick answers about api load testing tool.
It simulates many concurrent clients hitting your API to measure performance, find bottlenecks, and validate SLAs before production traffic arrives.
Ready to ship APIs with confidence?
Join developers who test smarter. Run your first request in minutes, then scale. when you need load and traffic insights.