GeezerVison

DevTools is a powerful browser-based debugging interface for visualizing, controlling, and inspecting your test executions in real-time. It works with WebdriverIO, Nightwatch.js, Selenium WebDriver (any runner) and Python Selenium — same backend, same UI, same capture infrastructure.

What It Provides​

• Rerun tests selectively - Click on any test case or suite to re-execute it instantly (details)
• Preserve & Rerun (Compare) - Snapshot a failing test, rerun it, and diff the two runs side-by-side aligned by command (details)
• Debug visually - See live browser previews with automatic screenshots after each command
• Track execution - View detailed command logs with timestamps and results
• Monitor network & console - Inspect API calls and JavaScript logs (network · console)
• Navigate to code - Jump directly to test source files with TestLens (details)
• Record sessions - Continuous .webm video of the browser, per session (details)
• Mobile - Appium sessions (mobile browser, native and hybrid apps) in live and trace mode (details)
• Trace mode - Headless capture path producing a portable trace.zip artifact for offline replay or agentic consumption (details)

How It Works​

1. Start your tests as normal
2. DevTools automatically opens a browser window at http://localhost:3000
3. The UI shows test hierarchy, browser preview, command timeline, and logs in real-time
4. After tests complete, click any test to rerun it; the rerun runs in a fresh test process and streams into the same dashboard window

Choose Your Framework​

• WebDriverIO - Use @wdio/devtools-service with Mocha, Jasmine, or Cucumber
• Nightwatch - Use @wdio/nightwatch-devtools with zero test code changes
• Selenium - Use @wdio/selenium-devtools with Mocha, Jest, Cucumber, or plain Node scripts
• Python Selenium - Use selenium-devtools-py under pytest or a plain script (see the Python tabs)