Your Entire QA &
Testing Suite. Inside
One Active Tab.

Stop toggling viewports. Experience real-time multi-device scroll-syncing, interactive element inspection, WCAG accessibility checks, and instant SEO audits natively in the browser.

SenangLab Workspace Mockup

Experience Live Interactive Simulation

Desktop
Tablet
Mobile

Powerfully Simple, Remarkably Fast

SenangLab streamlines your workflow with a suite of robust features designed for efficiency and accuracy.

Cross-Frame Sync

Throttled scroll-sync, click replication, and text selection sync across all devices.

Visual Style Inspector

Inspect elements, edit CSS live, and view interactive box models.

WCAG Accessibility

Test contrast scores and simulate color blindness instantly.

SEO Audit & AI Prompts

Scan tags, calculate SEO scores, and export AI prompts to fix issues.

Preset Device Library

Access 50+ presets and unlimited custom dimensions.

Seamless Screenshot Stitching

Stitch frames into a single PNG or copy to clipboard.

Preview and debug your website's responsiveness across multiple devices and screen sizes - from one tab

Catch breakpoints before anyone else does

  • ✓Apply adaptive grid overlaysto any device view to instantly verify alignment, spacing, and layout consistency. No guesswork, just clear visual confidence.
  • ✓Preview every screen size at once with 50+ built-in device presets, covering popular iPhones, Androids, tablets, desktop monitors and easily add your own custom breakpoints.
  • ✓Sync scroll and click actions across all panesto seamlessly test interactive components and animations across every breakpoint in one smooth workflow.
  • ✓Stack, reorder, and zoom device panesvertically or horizontally, tailor your workspace to match how you work best, not the other way around.

Edit any element without opening DevTools

  • ✓Click any element to instantly surfaceits colors, sizes, margins, and padding in a clean, intuitive visual breakdown. No more hunting through tangled code.
  • ✓Measure pixel distances between elementswith pixel-perfect precision: select one element and hover over another to see live, real-time distance values.
  • ✓Edit any CSS value directlyin the Inspect tool and watch your changes apply live across your entire workspace because creativity shouldn’t wait for recompilation.
  • ✓Track every CSS and content edit in the Activity tab;your full history lives in one place, making collaboration, review, and rollback effortless and stress-free.

Fix SEO issues in a snap

  • ✓Surface key on-page SEO datafor any page — from meta titles/descriptions and heading hierarchy to image alt text and canonical tags — all in one glance.
  • ✓Identify missing or broken SEO elementsbefore they slip through, like duplicate headings, missing alt text, or orphaned sitemaps, so your site stays optimized and search-friendly.
  • ✓Check how your site’s metadata rendersacross devices: visualize how it appears in SERPs on mobile, tablet, and desktop with a single click.
  • ✓Export findings directlyto your preferred format (PDF, CSV, or clipboard), so you can quickly share insights, assign action items, or integrate with your workflow — no context switching needed.

Check how your site looks for every visitor

  • ✓Simulate real-world vision impairmentslike color blindness (protanopia, deuteranopia, tritanopia), low vision, and full blindness; directly on your live, production site.
  • ✓Run AA/AAA color contrast ratio checksacross elements or entire pages and instantly extract every color used, so you can fix contrast issues before they exclude users.
  • ✓Catch accessibility issues early,not after launch, a customer complaint, or a legal audit. Build inclusivity into your process from day one, soeveryonecan use your site with ease.

Who Is SenangLab For?

Frontend Developers

Live edit CSS, inspect viewports, ensure design fidelity, sync layouts.

QA Engineers

Stitch multi-viewport reports, track edits, log bugs precisely.

UI/UX Designers

Verify typography, check readability with color blindness sims.

SEO Specialists

Automate audits, check URLs, export reports (JSON, CSV).

Ready to upgrade your web development workflow?

Get the extension and streamline your testing process with powerful, integrated tools.