Web application testing tools

Runtime and static analysis

• Lighthouse
• webhint

Accessibility testing

• Koa11y
• whocanuse
• ally.js
• WebAIM Contrast Checker
• Axe
• WAVE
• PowerMapper Accessibility Checker
• Pa11y

Performance analysis

• Yellow Lab Tools
• Web Check
• PageSpeed Insights
• GTmetrix
• WebPageTest
• Screpy
• keycdn Website Speed Test

Security analysis

• Bad SSL
• Security Headers
• Mozilla Observatory

Web page code analysis

• CSS Stats
• CSS Specificity Analyzer
• Wallace
• Parker
• CSS Spider

Linting

• Stylelint

Rendering analysis

• React Scan

HTTP clients and proxies, and API testing

• Tweak
• Insomnia
• Postman
• Fiddler
• Karata: Gherkin-based HTTP API testing framework.
• REST Assured: HTTP API testing using a fluent Java API.

HTTP mocking

• SuperAgent
• mswjs - Mock Service Worker
• counterfact
• axios-mock-adapter
• httpbin.org
• json-server
• Mirage
• Fetch Mock
• WireMock
• Mockend
• Nock