Loupely Lens›Loupely vs. Competitors›VisBug
VisBug is a free, open source design tool. You point, click, and edit a live page like an artboard. It’s built for designers who want to experiment. If you’re a site owner whose layout broke and you need to know which CSS rule is responsible, that’s a different problem. Loupely Lens is built for that one.
Loupely Lens›vs. Competitors›VisBug
VisBug edits what you see.
Lens explains why it looks that way.
7-day free trial No card required Any website in Chrome
VisBug turns any live page into an artboard. It’s built for experimenting, not diagnosing.
VisBug is a free, open source Chrome extension originally built by Google ChromeLabs. It’s been described as FireBug for designers: instead of a developer’s code inspector, it gives designers a set of visual editing tools they can use directly on any live page. You can move elements, adjust margins and spacing, edit text, swap images, inspect alignment, and see accessibility information. Changes are temporary. They vanish on refresh. That’s the point. VisBug is a sandbox for visual exploration and rapid prototyping, not a place to make permanent fixes.
The tool is fully free, available on Chrome and Firefox, and has no paid tier. Its audience is designers who want to work in the browser the way they’d work in Figma or Sketch: directly manipulating the rendered output. It’s well suited for mockup reviews, design QA against a live build, and experimenting with layout ideas without touching code. The assumption baked in is that you want to change something temporarily, not understand something permanently.
What VisBug doesn’t do: it doesn’t read the CSS cascade, it doesn’t classify where rules came from, it doesn’t identify which rule is overriding another, and it doesn’t tell you why something looks wrong. It gives you tools to edit what you see. For a designer prototyping a layout change, that’s exactly right. For a site owner whose section stopped centering after a plugin update and who needs to know what’s causing it, VisBug has nothing to offer.
Your text is overlapping another element. You need to know what’s controlling the spacing.
Same element. Same problem. Same moment.
All spacing values read zero. You can drag to adjust them visually in the browser. But that won’t tell you why the overlap is happening or what rule to change in your theme to fix it permanently.
VisBug showed the spacing values. Lens found where the zero spacing was coming from, why it was overriding everything, and what to do about it permanently.
VisBug lets you change it. Lens tells you why it’s wrong in the first place.
| Capability | VisBug | Loupely Lens | |
|---|---|---|---|
| Click on any element to inspect its styles | |||
| Works on any website in Chrome | |||
| Visually move, resize, and edit elements live in the browser | |||
| Edit text and swap images directly on the page | |||
| Previews your target value on the live page, then tells you whether it would hold | |||
| Classifies where each rule came from: theme, page builder, plugin, inline, browser default | |||
| Identifies which rule is winning and which rule is losing | |||
| Reads the full ancestor chain to find parent constraints | |||
| Real human terms diagnosis: exactly why the element looks wrong | |||
| Saves changes permanently to your site |
VisBug is for designers who experiment. Lens is for site owners who are stuck.
The distinction isn’t quality. Both tools do their job well. The jobs are different.
You’re a designer prototyping changes on a live page
VisBug is the right tool for designers who want to work directly in the browser: adjust spacing, move elements, swap text, experiment with layout ideas without touching the codebase. If you’re doing design QA against a live build or iterating on a visual prototype, VisBug gives you a fast, tactile way to work.
Something on your site looks wrong and you need it fixed
You updated a plugin and a section shifted. You changed a setting and nothing happened. You added CSS and the layout broke anyway. VisBug lets you drag things around visually, but it doesn’t tell you which rule is causing the problem or what to change to fix it permanently. Lens does that: one click, one answer, one thing to paste or change.
You need a developer to fix it and want to give them the right information
VisBug can show a developer what something looks like. Lens gives them a structured capture file with origin classification, the full ancestor chain, and every competing rule: everything needed to write the correct fix on the first attempt, before asking follow-up questions.
Changes don’t save. It can’t tell you what’s causing the problem.
VisBug edits are temporary. They disappear on refresh. More importantly, VisBug doesn’t read the CSS cascade, doesn’t explain why a rule is winning, and doesn’t traverse the ancestor chain. It’s a visual sandbox. Figuring out what to permanently change in your theme or plugin settings is a separate problem it doesn’t solve.
Common questions about Loupely Lens vs. VisBug.
Can I use VisBug to fix a CSS problem on my site?
Not permanently. VisBug edits exist only in your browser session and disappear when you refresh. More importantly, VisBug doesn’t tell you which CSS rule is responsible for what you’re seeing or what to change in your codebase to fix it. It lets you manipulate the rendered output visually, but the underlying problem stays until you make the right change in your theme, plugin, or Custom CSS field.
VisBug is free and open source. Why would I pay for Lens?
VisBug and Lens don’t compete for the same moment. VisBug is for visual experimentation: prototyping, checking alignment, seeing what a change might look like. Lens is for when something is broken and you need the specific rule causing it, where it came from, and what to change permanently. The 7-day trial starts on your first diagnosis, no card required. After that, Lens Annual is $49/year for unlimited diagnoses.
Does Lens work on any website, or just WordPress?
Any website in Chrome. WordPress, Shopify, Webflow, Squarespace, Framer, custom builds. If you can open it in Chrome, Lens can read it.
What does Lens actually give me after I click on an element?
A 2-sentence diagnosis in real human terms explaining exactly what’s causing the visual problem, plus a specific next step: either a ready-to-paste CSS override for your Custom CSS field, a settings change to make inside your page builder or theme, or a structured developer handoff file with everything they need to write the fix first try.
What if Lens can’t identify a clear cause?
If the diagnosis isn’t conclusive, Lens says so. It won’t produce a guess. You still get the complete capture file with the raw CSS state, origin classification, and ancestor chain. That’s everything a developer needs to write the correct fix on the first attempt, without the usual back-and-forth to gather context. The capture file is always useful even when the diagnosis isn’t.
Click on what looks wrong. Finally know what is causing it.
7-day free trial, no card required. Unlimited diagnoses with the annual plan.