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Preview of ViewGrid — Responsive Viewer

ViewGrid — Responsive Viewer by Sinan

Test mobile, tablet, and desktop layouts side-by-side with synchronized scrolling, interactions, and visual comparison tools.

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Multi-Viewport Matrix Grid: Preview iPhone, iPad, Laptop, and Desktop viewports side-by-side with synchronized scrolling and freeform drag-and-drop alignment.Visual Comparison Engine: Compare responsive breakpoints using interactive Dual-Split slider, Overlay Curtain, and pixel-level diffing.Responsive Inspector & Diagnostics: Detect horizontal scroll overflows, small tap targets, and inspect ultra-low memory footprint (<15 MB RAM).Sync Hub & Responsive Inspector: Granularly toggle scroll, click, navigation, and reload sync while automatically scanning DOM for horizontal overflows.Dark Theme Workspace: Synchronize clicks, scroll, and navigation across custom device viewports with zero-echo interaction protocol.
About this extension
ViewGrid is a multi-viewport responsive testing workspace for frontend developers, designers, and QA engineers.

Test mobile, tablet, laptop, and desktop layouts side-by-side in one browser tab — with synchronized scrolling and interactions.
  • Multi-Viewport Workspace: Test multiple screen sizes simultaneously.
  • 21+ Device Presets: Preview popular phone, tablet, laptop, desktop, and foldable sizes.
  • Custom Viewports: Create your own width, height, and DPR combinations.
  • Portrait & Landscape: Switch orientation instantly.
  • Flexible Layouts: Arrange viewports in grid, row, or column layouts.
  • Synchronized Scrolling: Scroll once and compare every breakpoint.
  • Interaction Sync: Mirror clicks and supported interactions across viewports.
  • Navigation Sync: Keep active previews on the same page while testing.
  • Figma Design Overlay: Overlay PNG or SVG designs on live pages for visual comparison.
  • Split Comparison: Compare responsive layouts interactively.
  • Screenshot Capture: Export individual viewport or workspace screenshots.
  • Responsive Issue Scanner: Detect horizontal overflow, clipped content, and small touch targets.


Use ViewGrid with localhost, staging environments, internal development environments, and production websites.

Ideal for responsive design testing, CSS debugging, breakpoint testing, frontend development, design QA, and cross-device layout verification.


ViewGrid runs locally in your browser with zero telemetry.

There are no analytics trackers or ViewGrid cloud servers processing your page content.

Stop resizing your browser. Test every breakpoint at once.
Developer comments
ViewGrid is an ultra-fast, lightweight browser extension built with Manifest V3, React 18, TypeScript, and Vite.


• Architecture: Scoped DeclarativeNetRequest (Chromium) & WebRequest (Firefox) for header relaxation.
• Performance: Executes inside native browser runtimes consuming <15 MB RAM without heavy Electron process overhead.
• Sync Protocol: Epoch-fenced, sequence-numbered interaction hub preventing echo feedback loops.
• Privacy: 100% Client-Side. Zero telemetry, zero external tracking, zero analytics beacons.

• GitHub Repository: https://github.com/sinansarikaya/viewgrid
• Official Site: https://viewgrid.sinansarikaya.dev
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Permissions and data

Required permissions:

  • Clear recent browsing history, cookies, and related data
  • Block content on any page
  • Download files and read and modify the browser’s download history
  • Access browser tabs
  • Access your data for all websites

Optional permissions:

  • Access your data for all websites

Data collection:

  • The developer says this extension doesn't require data collection.
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More information
Version
1.0.1
Size
117.18 KB
Last updated
3 days ago (Sep 24, 2026)
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