Who is Inspector for?

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

Does Inspector have a free plan?

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

What platforms does Inspector run on?

Inspector runs on the web and embeddable surfaces.

Is Inspector still maintained?

Unverified. Inspector 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 projects are similar to Inspector?

Similar projects tracked by PulseGate include Inspector, Extension Inspector, and Inspector.

Who develops Inspector?

Inspector is developed by derivia.

When did Inspector launch?

Inspector first shipped in 2025.

Back to the index

Inspector

Name: Inspector
Author: derivia

github.comBrowser DevTools & extensions

Inspector is an open-source Firefox browser extension for examining HTML elements, their placement, and their dimensions. It provides hover-based inspection features to help web developers debug and understand page layouts.

Open SourceWebEmbeddable

Visit github.com

Overview

5 features

Inspector is a Browser DevTools & extensions project. It focuses on inspecting HTML element placement and dimensions without manually measuring page layouts. It is built as an open-source project for web developers and frontend designers. The project is open source (Open Source). Inspector is available on the web and embeddable surfaces.

It is developed by derivia, and it first shipped in 2025. Among its 5 catalogued features are element inspection, hover inspection, and placement measurement.

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

Element inspection
Hover inspection
Placement measurement
Size measurement
HTML debugging

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

License

Open Source

Verified signals

HTTPSPrivacy Policy Terms of ServiceOpen SourceFree tierStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed13 Sep · 12:50 UTC
Inspector verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Inspector

What does Inspector do?: Inspector focuses on inspecting HTML element placement and dimensions without manually measuring page layouts. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Inspector for?: Inspector is an open-source project built for web developers and frontend designers.
Does Inspector have a free plan?: Yes — Inspector is open source under the Open Source license and free to use.
What platforms does Inspector run on?: Inspector runs on the web and embeddable surfaces.
Is Inspector still maintained?: Unverified. Inspector 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 projects are similar to Inspector?: Similar projects tracked by PulseGate include Inspector, Extension Inspector, and Inspector.Inspector Extension Inspector Inspector
Who develops Inspector?: Inspector is developed by derivia.
When did Inspector launch?: Inspector first shipped in 2025.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
Built for: web developers and frontend designers
Model: Open source
Solves: Inspecting HTML element placement and dimensions without manually measuring page layouts.

Registered as

Firefox Add-ons: css-inspector

Developer

derivia

Index record

Indexed: 13 Sep 2026
Lifecycle: Alive
Last seen: 13 Sep 2026

Identity audit (13)

Slug: inspector-github-com
Lifecycle state recorded: 13 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 13 Sep 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: 13 Sep 2026
Canonical URL: https://github.com/derivia/inspector

Ship this? Send a correction — no account, and you get a link to follow it.

Similar projects

Closest matches by what these projects do