Page Ruler alternative · 2026 comparison
Page Ruler measures the width and height of a draggable rectangle. Naked CSS measures pixel distance between elements, resolves CSS variables, and detects flex/grid gaps — built for design audits and layout debugging, not just single-rectangle measurement.
Page Ruler is a free Chrome extension by leocompson that turns your cursor into a rectangular ruler for measuring element sizes in pixels. Drag across any element to see its width, height, and corner coordinates labeled in real time. With 500,000+ installs and a 3.9-star rating on the Chrome Web Store (last updated April 4, 2026), Page Ruler is the long-tenured incumbent for simple width-and-height measurement on web pages. Naked CSS extends the same idea with multi-element distance measurement, CSS variable resolution, and flex/grid gap detection — built for full design audits, not just single-rectangle sizing.
Page Ruler does one thing well: it draws a rectangle on your page and tells you its width and height in pixels. It's been doing this for years, has half a million installs, and is great when you need a quick W/H of a single element. Naked CSS solves a different (and broader) problem — measuring the distance between elements, resolving the CSS variables behind every color, detecting flex and grid gap values, and simulating :hover / :active states. If you need a single-element ruler, Page Ruler is fine. If you're doing layout audits, design QA, or debugging spacing across multiple elements at once, Naked CSS replaces Page Ruler and adds the rest of the audit toolkit on top.
Every claim below is a feature you can verify in either extension. Both ship as Chrome Manifest V3 extensions. Both are free. Comparison data sourced from the Chrome Web Store listings as of 2026-05-17.
Page Ruler is a category-defining extension. With 500,000+ installs over many years, it earned its place by being uncomplicated: install, click the toolbar icon, drag a rectangle, read off the pixel values. The rectangular-ruler UX is instantly understandable — you don't need a tutorial, and it never gets in your way.
The team has kept it actively maintained (last update April 4, 2026), committed to not collecting user data, and continues to accept feature requests through the developer's homepage. For a tool that has been in the Chrome Web Store this long, that level of stewardship is rare.
If your workflow is “how many pixels wide is this thing?” a hundred times a day, Page Ruler does that one job faster than almost anything else.
The single biggest workflow Page Ruler doesn't cover. Click an element to lock the selection, hover any second element, and both horizontal and vertical pixel distances render on-page with labeled guide lines. This is the measurement a design audit actually needs — “how far is this button from the heading” — not the dimensions of a rectangle you drew.
Every color Naked CSS surfaces — text, background, border — is annotated with the CSS custom property name that produced it (e.g. --color-primary-500, --space-4). Page Ruler doesn't touch CSS variables. For modern design-system work where colors and spacing live as tokens, that's a critical gap.
Naked CSS hatches and labels every flex and grid gap region with its pixel value. Page Ruler shows you the bounding rectangle of an element, but not the space between flex/grid children — which is where most spacing bugs actually live in modern layouts.
Toggle Default, Hover, and Active states for any selected element with a single click. Inspect interactive styles without scripting them or moving your cursor. Not something Page Ruler attempts.
Page Ruler activates via a toolbar button click. Naked CSS uses Cmd+I by default and lets you rebind to whatever fits your muscle memory. For an audit loop where you toggle dozens of times per session, the keyboard difference compounds.
:hover and :active states without writing JavaScript.The honest answer: many users keep both pinned. Quick W/H with Page Ruler, full audit with Naked CSS.
Naked CSS is free, focused on measurement and design-audit verification, and installs in ten seconds.