Open source testing tools, ranked by score and analyzed honestly. Part of our Developer Tools coverage.
Ranked by score. Updated weekly.
Fast, reliable browser testing
JavaScript API for Chrome and Firefox
Web testing and automation framework
Industry standard UI component workshop
Delightful JavaScript testing
Browser automation framework
React DOM testing utilities
SMTP testing tool
Scalable Python testing framework
Scalable load tests in plain Python
Test your prompts, agents, and RAGs. Red teaming/pentesting/vulnerability scanning for AI. Compare performance of GPT, Claude, Gemini, DeepSeek, and more. Simple declarative configs with command line and CI/CD integration. Used by OpenAI and Anthropic.
Next-gen testing framework powered by Vite
Modern load testing tool
Property-based testing for web UIs — autonomously explores and validates correctness properties, finding real bugs.
A lightweight AWS service emulator written in Go