CSS Insight focuses on inspecting and understanding the CSS applied to web pages during frontend development. It is catalogued under Browser DevTools & extensions on PulseGate.

Who is CSS Insight for?

CSS Insight is an open-source project built for frontend developers and web designers.

Does CSS Insight have a free plan?

Yes — CSS Insight is open source under the Open Source license and free to use.

What platforms does CSS Insight run on?

CSS Insight runs on the web and embeddable surfaces.

Is CSS Insight still maintained?

Unverified. CSS Insight has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What are alternatives to CSS Insight?

Similar projects tracked by PulseGate include CSSViewer, Daily Coding Insight, and CSS-X-Fire.

Who develops CSS Insight?

CSS Insight is developed by MarkAlexI.

When did CSS Insight launch?

CSS Insight first shipped in 2024.

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CSS Insight

Name: CSS Insight
Author: MarkAlexI

github.comBrowser DevTools & extensions

CSS Insight is an open-source Firefox web extension for analyzing CSS on web pages. It helps frontend developers and web designers inspect styles while working in the browser.

Open SourceWebEmbeddable

Visit github.com

Overview

4 features

CSS Insight sits in PulseGate's Browser DevTools & extensions category. It focuses on inspecting and understanding the CSS applied to web pages during frontend development. CSS Insight is an open-source project aimed at frontend developers and web designers. The project is open source (Open Source). It runs on the web and embeddable surfaces.

MarkAlexI builds and maintains CSS Insight, and it first shipped in 2024. Among its 4 catalogued features are CSS analysis, style inspection, and browser extension.

Summary written by a language model from the project’s public pages.

CSS analysis
Style inspection
Browser extension
Web page analysis

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

License

Open Source

Verified signals

HTTPSTerms of ServiceOpen SourceFree tierStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed12 Sep · 22:11 UTC
CSS Insight verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about CSS Insight

What is CSS Insight?: CSS Insight focuses on inspecting and understanding the CSS applied to web pages during frontend development. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is CSS Insight for?: CSS Insight is an open-source project built for frontend developers and web designers.
Does CSS Insight have a free plan?: Yes — CSS Insight is open source under the Open Source license and free to use.
What platforms does CSS Insight run on?: CSS Insight runs on the web and embeddable surfaces.
Is CSS Insight still maintained?: Unverified. CSS Insight has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What are alternatives to CSS Insight?: Similar projects tracked by PulseGate include CSSViewer, Daily Coding Insight, and CSS-X-Fire.CSSViewer Daily Coding Insight CSS-X-Fire
Who develops CSS Insight?: CSS Insight is developed by MarkAlexI.
When did CSS Insight launch?: CSS Insight first shipped in 2024.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
Built for: frontend developers and web designers
Model: Open source
Solves: Inspecting and understanding the CSS applied to web pages during frontend development.

Registered as

Firefox Add-ons: css-insight

Developer

MarkAlexI

Index record

Indexed: 12 Sep 2026
Lifecycle: Alive
Last seen: 12 Sep 2026

Identity audit (13)

Slug: css-insight-github-com
Lifecycle state recorded: 12 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 12 Sept 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Written by a language model from the project's public pages.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 12 Sept 2026
Canonical URL: https://github.com/MarkAlexI/CSS-Insight-Firefox

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