Grid Gutter focuses on checking leftover pixels when sizing equal CSS grid tracks and gutters. It is catalogued under Browser DevTools & extensions on PulseGate.

Who should use Grid Gutter?

Grid Gutter is a consumer product built for web developers and CSS designers.

Yes — Grid Gutter is free to use.

What platforms does Grid Gutter run on?

Grid Gutter runs on the web and embeddable surfaces.

Is Grid Gutter still maintained?

Unverified. Grid Gutter 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 Grid Gutter?

Similar projects tracked by PulseGate include Grid Rhythm, Mosaic Grid, and Ink Grid.

Who makes Grid Gutter?

Grid Gutter is developed by Anthony J. Andres.

When did Grid Gutter launch?

Grid Gutter first shipped in 2026.

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Grid Gutter

Name: Grid Gutter
Author: Anthony J. Andres

mozilla.orgBrowser DevTools & extensions

Grid Gutter is a Firefox extension for inspecting CSS grid layouts. It shows leftover pixels after placing equal tracks and gutters in a row, helping web developers debug and refine responsive layouts.

FreeWebEmbeddable

Visit mozilla.org

Overview

5 features

Grid Gutter sits in PulseGate's Browser DevTools & extensions category. It focuses on checking leftover pixels when sizing equal CSS grid tracks and gutters. Grid Gutter is a consumer product aimed at web developers and CSS designers. Grid Gutter is free to use. Grid Gutter is available on the web and embeddable surfaces.

It is developed by Anthony J. Andres, and it first shipped in 2026. Key capabilities include pixel remainder display, CSS grid inspection, and equal track analysis. The interface is available in 32 languages, including Czech, German, and Greek.

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

Pixel remainder display
CSS grid inspection
Equal track analysis
Gutter analysis
Firefox integration

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed4 Sept · 22:32 UTC
Grid Gutter verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Grid Gutter

What is Grid Gutter?: Grid Gutter focuses on checking leftover pixels when sizing equal CSS grid tracks and gutters. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use Grid Gutter?: Grid Gutter is a consumer product built for web developers and CSS designers.
Is Grid Gutter free?: Yes — Grid Gutter is free to use.
What platforms does Grid Gutter run on?: Grid Gutter runs on the web and embeddable surfaces.
Is Grid Gutter still maintained?: Unverified. Grid Gutter 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 Grid Gutter?: Similar projects tracked by PulseGate include Grid Rhythm, Mosaic Grid, and Ink Grid.Grid Rhythm Mosaic Grid Ink Grid
Who makes Grid Gutter?: Grid Gutter is developed by Anthony J. Andres.
When did Grid Gutter launch?: Grid Gutter first shipped in 2026.

At a glance

Pricing: Free
Platforms: Web
First seen: 4 Sept 2026
Built for: web developers and CSS designers
Model: B2C
Solves: Checking leftover pixels when sizing equal CSS grid tracks and gutters.

Registered as

Firefox Add-ons: grid-gutter

Developer

Anthony J. Andres

Index record

Indexed: 4 Sept 2026
Lifecycle: Alive
First seen: Sept 2026
Last seen: 4 Sept 2026

Identity audit (13)

Slug: grid-gutter-mozilla-org
Lifecycle last checked: 8 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 4 Sept 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Derived from the project's own page and URL.
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: 4 Sept 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/grid-gutter

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