UI Testing Inspector

Compare visual changes before and after making updates to web pages with detailed diff reports and DOM analysis.

Tired of manually checking for visual bugs after every code change? UI Testing Inspector is your go-to visual diff checker with DOM analysis. Why use it? ⚡️ 100% Local & Private: all screenshots and comparison data stay on your computer. No cloud services, no data sharing ⚡️ Instant Feedback Loop: install the extension, take a baseline, make your code changes, and see the differences instantly. Perfect for quick regression tests ⚡️ Pixel-Perfect Detection: catch even the smallest visual changes that human eyes might miss Key Features: 🔸 One-Click Baseline: capture the "before" state of any webpage with a single click 🔸 Pixel-Perfect Visual Diff: get a clear report showing the baseline, the current state, and an image highlighting the exact differences 🔸 Inspect Element: go beyond the basic inspector. See not just the code, but also what has changed in the DOM and CSS 🔸 Full Page & Viewport Capture: choose between capturing the visible area or the entire scrollable page 🔸 Report History: save and review up to 15 previous comparison reports 🔸 Light & Dark Themes: for comfortable viewing, day or night Inside Detailed Report 🔍 After every comparison, you get a comprehensive report that gives you the full picture: ✔️ Summary: the percentage of visual differences and a count of added, removed, and modified elements ✔️ Side-by-Side View: compare "Before" and "After" screenshots right next to the highlighted "Differences" image ✔️ DOM & CSS Change List: pinpoint the exact elements that changed. No more guessing why a pixel moved — see the code-level changes like color, font-size, or margin ✔️ Technical Details: comprehensive analysis of layout changes, content modifications, and structural updates What You'll Catch: ➤ Layout shifts and misalignments ➤ Color and styling changes ➤ Missing or moved elements ➤ Font and text modifications ➤ Image differences How It Works: 1️⃣ Set a Visual Baseline: navigate to the page you want to test and click "Set Baseline" in the extension popup. This is your source of truth. 2️⃣ Code with Confidence: make changes to your CSS, update content, or refactor components. 3️⃣ Instantly Check for Changes: click "Compare with Baseline". A new tab will open with a detailed visual report. 4️⃣ Analyze the Differences: use the side-by-side view and the list of detected changes to spot every issue. 5️⃣ Update the Baseline: happy with the new version? Simply click "Set Baseline" again to save the new look as your reference. Pro Tips ✨ Wait for pages to load completely before capturing baselines ✨ Use full-page capture for comprehensive testing ✨ Take screenshots in the same browser window size for accurate comparisons ✨ Capture baselines when content is stable ✨ Test one change at a time for clearer diff results ✨ Save important baselines before major code refactors ✨ Compare similar page states (same user login status, data loaded) Use Cases ✅ Visual Regression Testing: the core use case. After making changes, run a comparison to catch any unintended visual bugs. ✅ UI/Design Verification: ensure pixel-perfect implementation and brand consistency against design mockups. ✅ CSS Refactoring: fearlessly refactor legacy CSS. A quick visual diff test will immediately tell you if your changes had any unexpected side effects. ✅ Frontend Testing: an essential tool for any frontend testing workflow, providing immediate visual feedback. Who's It Built For? ➡️ Frontend Developers: Catch layout issues before you commit your code ➡️ QA Engineers: Enhance your manual UI tests with a reliable visual verification step ➡️ UI/UX Designers: Quickly ensure the live implementation matches your designs ➡️ Freelancers & Small Teams: A visual testing tool without the enterprise price tag FAQ ❓How does it detect changes? 💬 It uses a dual-method approach: a pixel-by-pixel comparison for the visual diff and a structural scan for the DOM/CSS change list. ❓Is my data secure? 💬Yes. Everything is processed and stored 100% locally in your browser. ❓ Can I use it on localhost? 💬 Absolutely! It works perfectly during local development ❓ What about dynamic content? 💬 The tool is designed for comparing static states. For best results, capture your screenshots when animations are complete and ads are stable.