CSS Spy icon

CSS Spy

Extension Delisted

This extension is no longer available in the official store. Delisted on 2025-09-15.

Extension Actions

CRX ID
plbeolffejbcpmndnfknfkcaofdmdeln
Description from extension meta

Showing CSS attribute on element hover

Image from store
CSS Spy
Description from store

Inspect computed styles of any single element just on the fly. When the extension is active, hovering element will shows the width, height and selector name of the element. Clicking on the element will bring popup which show the common computed styles of the element, so you could just copy it right away. Comparing CSS properties of 2 elements will also never been this easier with this extension.

Features:
1. Showing width and height when hovering on an element
2. Showing computed style when clicking on an element
3. Comparing CSS properties of 2 element (even work with elements from different page/URL)
4. Clean design (yeah, that's exactly what we need)

Change log:
v.1.0:
Fixing minor bugs

v1.1:
Change RGB to hex

v1.2:
Add ability to reset storage when new window created

v1.3:
- Add feature to compare 2 different CSS
- Add settings to choose properties to show

v1.4:
- Add CSS Reset for the popup

v1.5:
- Relocated files and folder
- Add exception for storage limit

Latest reviews

Scott Madore
This doesn't work for me. Does this work anymore?
Ryan Leach
Found it impossible to use, Could not see a menu, could not see a hover, instructions in extension description incredibly unclear on how to use. Screenshots look amazing, but unfortunately I was not able to invoke any actions into displaying.
Andy Woodhouse
Great extension - EXACTLY what I've been looking for - Thanks again!
P N
Doesn't work for me, I click the icon, it becomes green or brown, but nothing's done.
Adam Sturge
Was looking for exactly this when working on a website. Since Inspector sometimes changes the size of the CSS then it can be helpful to use this. Keep up the great work guys! 10/10 must download
Sgt Bertrand
Controls are terrible
Rogerio M. Souza
Excellent! Thanks @SoftwareSeni...
Dz Trending
^^ amazing very helpful
Gideon Widyatmoko
Works very well
Faisal R
Wow, a very helpful tool for Quality Assurance, thank you!