Best alternatives to Outliner CSS (2026)
10 Chrome extensions that do a similar job to Outliner CSS, closest first. Each shows real store users, its rating, how recently it was updated and how many permissions it asks for.
Outliner CSS today
Outliner CSS alternatives, compared
- 1
Debug CSS
When enabled adds outline to all elements on the page, Hold Ctrl and hover to get more detail
≈10K users4.5★ from 48 ratingsUpdated 20 months ago2 permissions- A similar number of users to Outliner CSS
- Updated less recently
- Asks for fewer permissions (2 vs 3)
- 2
Pesticide - Advanced CSS Debugger
Not only inserts outlines (without background color) on all elements, but also inspects size and layout. CSS is awesome!
≈20K users4.9★ from 99 ratingsUpdated 3 weeks ago4 permissions- About 2.0× more users than Outliner CSS
- Updated more recently
- Asks for more permissions (4 vs 3)
- 3
UI Inspector - Visual CSS Editor
Inspect and visually edit elements and their CSS directly on the page for faster design and UI debugging.
≈5K users4.0★ from 21 ratingsUpdated 7 months ago8 permissions- About 2.0× fewer users than Outliner CSS
- Updated less recently
- Asks for more permissions (8 vs 3)
- 4
Pesticide
A CSS debugging tool that inserts outlines onto all elements to help with debugging layout issues
≈200K users3.4★ from 145 ratingsUpdated 20 months ago2 permissions- About 20× more users than Outliner CSS
- Updated less recently
- Asks for fewer permissions (2 vs 3)
- 5
Pesticide (without hover bar)
A CSS debugging tool that outlines all page elements to help identify and fix layout issues.
≈1K users5.0★ from 5 ratings2 permissions- About 10× fewer users than Outliner CSS
- Asks for fewer permissions (2 vs 3)
- 6
Knockout Context Hover
KnockoutJS Context Hover - Development and debugging assistant for Knockout JS. Tested on: 3.4.2, 3.1.0, 2.2.1
≈2K users3.8★ from 10 ratingsUpdated 21 months ago4 permissions- About 5.0× fewer users than Outliner CSS
- Updated less recently
- Asks for more permissions (4 vs 3)
- 7
Liner. The Real Ruler
Simple and convenient rulers for web developers. They help to create a perfect pixel web application.
≈10K users3.1★ from 76 ratingsNot updated for 3+ years3 permissions- A similar number of users to Outliner CSS
- Updated less recently
- 8
Datalayer Checker
The easiest way to debug and check the dataLayer implementations without having to use the browser console!
≈100K users4.4★ from 49 ratingsUpdated 16 months ago5 permissions- About 10× more users than Outliner CSS
- Updated less recently
- Asks for more permissions (5 vs 3)
- 9
Outline HTML Elements
Outline HTML elements with a colorful border without affecting the layout to inspect website structure.
≈1K users5.0★ from 8 ratingsUpdated 20 months ago4 permissions- About 10× fewer users than Outliner CSS
- Updated less recently
- Asks for more permissions (4 vs 3)
- 10
DataLayer Checker Plus
The simplest way to debug and verify dataLayer implementations without using the browser console
≈20K users4.9★ from 69 ratingsUpdated 18 months ago4 permissions- About 2.0× more users than Outliner CSS
- Updated less recently
- Asks for more permissions (4 vs 3)
Outliner CSS alternatives: questions
What is the best alternative to Outliner CSS?
By users, the most popular alternative is Pesticide with ≈200K users and a 3.4-star rating. The closest match by what it does is Debug CSS.
Which Outliner CSS alternative has the best rating?
Pesticide - Advanced CSS Debugger has the highest rating of these alternatives with 50+ ratings: 4.9 out of 5 from 99 ratings.
Is there a Outliner CSS alternative that asks for fewer permissions?
Debug CSS asks for 2 permissions, against 3 for Outliner CSS.
How many alternatives to Outliner CSS are there?
We list 10 close alternatives to Outliner CSS on the Chrome Web Store, picked by what they do and ranked by how close they are.
Users and ratings are the figures shown on the Chrome Web Store, re-checked continuously. Alternatives are matched on name, description, category and topic. Browse best-of lists by niche.