k6 (Grafana)
Modern load testing tool using JavaScript scripts with developer-friendly workflow.
k6 is a modern load testing tool by Grafana Labs that uses JavaScript for test scripts. Features: browser testing, protocol support (HTTP, WebSocket, gRPC, SQL, Kafka), thresholds for pass/fail criteria, stages for ramp-up patterns, and extensible extensions system. Integrates with Grafana for visualization and Grafana Cloud k6 for managed execution. Developer-first approach to performance testing.
- Best for: Testing & Quality
- Pricing: Free and open-source (AGPL), Grafana Cloud k6 from $0 (10k VUs free)
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Features
API Testing
Testing REST, GraphQL, and gRPC endpoints
HTTP, WebSocket, gRPC, SQL, Kafka protocols
CI/CD Integration
Native integration with CI/CD pipelines
GitHub Actions, GitLab, and CLI integration
Code Coverage
Measurement of code paths exercised by tests
Not applicable for load testing
Code Quality Gates
Automated quality checks before merge/deploy
Thresholds for pass/fail criteria
Cross-Browser Support
Testing across Chromium, Firefox, WebKit, and Edge
Browser module supports Chromium
End-to-End Testing
Full browser-based testing simulating real user workflows
Browser testing module (experimental)
Load Testing
Performance and stress testing at scale
Core feature: load and performance testing
Parallel Execution
Run tests concurrently for faster feedback
Distributed execution via k6 Cloud or Operator
Unit Testing
Fast isolated tests for individual functions and modules
Not a unit testing framework
Visual Regression
Detection of UI layout and visual changes
Not a visual testing tool
Best For
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