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A visual layout and spacing inspector for designers and frontend developers. Plumb is a visual layout inspector for designers and frontend developers. Inspect spacing, dimensions, alignment, grids, and page structure directly on any webpage without digging through DevTools. Plumb turns layout information into clear visual overlays, helping you understand how interfaces are structured and measure them precisely. Element Inspector Inspect element width and height View X/Y position See display and positioning behavior Click to lock an element for closer inspection Box Model Visualize margins and padding Inspect individual top, right, bottom, and left values See content dimensions and box-sizing information Flexbox & Grid Detect Flexbox and CSS Grid automatically Inspect gap, row gap, and column gap View alignment and justification Inspect flex direction and wrapping Understand the parent layout controlling an element Distance Measurement Measure spacing between two elements View horizontal and vertical edge-to-edge distances Hold Option/Alt while hovering to compare elements quickly Pixel Ruler Measure any arbitrary distance on a webpage Drag between two points View X/Y delta and distance Hold Shift to constrain measurements horizontally or vertically Layout Guides Add configurable column grids Adjust column count and gutter width Set outer margins Add baseline guides Control overlay opacity Outline Mode Reveal the structure of an entire webpage Distinguish containers, text, media, forms, and interactive elements Keyboard Controls Navigate through parent, child, and sibling elements Quickly toggle Inspector and Outline modes Designed for focused inspection Plumb focuses exclusively on layout, geometry, spacing, and page structure. It does not include typography inspection, color extraction, or unrelated development tools. Privacy-first Plumb works locally in your browser. Page measurements and inspected content are not uploaded to a server, and no account is required. Built for designers, frontend developers, QA teams, and anyone who wants to understand webpage layouts visually.
Aug 19, 2026
rating_count is the Chrome Web Store ratings count, not a written-review count.
Media assets
Screenshots and videos on the listing.
Has promo video
Whether the listing includes at least one video.
Languages
Declared language locales.
Developer website
Listing exposes a developer website URL.
Contact email
Listing exposes a contact email.
Keyword in name
Case-insensitive substring match in the name.
Keyword in description
Case-insensitive substring match in the description.
Keyword occurrences in description
Count of case-insensitive occurrences in the description.
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
These are transparent listing completeness / keyword signals, not a prediction of Chrome Web Store search ranking.