Protractor focuses on measuring angles in browser content without switching to a separate tool. It is catalogued under Browser DevTools & extensions on PulseGate.

Who should use Protractor?

Protractor is an open-source project built for students, educators, designers, and web users.

Does Protractor have a free plan?

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

What platforms does Protractor run on?

Protractor runs on the web and embeddable surfaces.

Is Protractor still active?

Unverified. Protractor 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.

Who develops Protractor?

Protractor is developed by ghmon.

When did Protractor launch?

Protractor first shipped in 2025.

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Protractor

Name: Protractor
Author: ghmon

github.comBrowser DevTools & extensions

Protractor is an open-source browser extension that lets users measure angles over web pages. It is adapted for Firefox from an original Chrome extension and is useful for geometry, education, design, and visual analysis.

Open SourceWebEmbeddable

Visit github.com

Overview

5 features

Protractor sits in PulseGate's Browser DevTools & extensions category. It focuses on measuring angles in browser content without switching to a separate tool. It is built as an open-source project for students, educators, designers, and web users. Protractor is open source under the Open Source license. It runs on the web and embeddable surfaces.

It is developed by ghmon, and it first shipped in 2025. Among its 5 catalogued features are angle measurement, browser overlay, and firefox support.

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

Angle measurement
Browser overlay
Firefox support
Chrome support
Web page measurement

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

Indexed10 Sept · 01:39 UTC
Protractor verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Protractor

What is Protractor?: Protractor focuses on measuring angles in browser content without switching to a separate tool. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use Protractor?: Protractor is an open-source project built for students, educators, designers, and web users.
Does Protractor have a free plan?: Yes — Protractor is open source under the Open Source license and free to use.
What platforms does Protractor run on?: Protractor runs on the web and embeddable surfaces.
Is Protractor still active?: Unverified. Protractor 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.
Who develops Protractor?: Protractor is developed by ghmon.
When did Protractor launch?: Protractor first shipped in 2025.
Is Protractor open source?: Yes — Protractor is open source under the Open Source license.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
Built for: students, educators, designers, and web users
Model: Open source
Solves: Measuring angles in browser content without switching to a separate tool.

Registered as

Firefox Add-ons: protractor

Developer

ghmon

Index record

Indexed: 10 Sept 2026
Lifecycle: Alive
Last seen: 10 Sept 2026

Identity audit (13)

Slug: protractor-github-com
Lifecycle state recorded: 10 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 10 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: 10 Sept 2026
Canonical URL: https://github.com/ghmon/protractor

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