What is Reading Ruler?

Reading Ruler focuses on losing your place while reading dense or lengthy text in a browser. It is catalogued under Browser DevTools & extensions on PulseGate.

Who should use Reading Ruler?

Reading Ruler is an open-source project built for people who read long-form web content.

Does Reading Ruler have a free plan?

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

What platforms does Reading Ruler run on?

Reading Ruler runs on the web and embeddable surfaces.

Is Reading Ruler still maintained?

Unverified. Reading Ruler 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 Reading Ruler?

Reading Ruler is developed by orentrutner.

When did Reading Ruler launch?

Reading Ruler first shipped in 2020.

Is Reading Ruler open source?

Yes — Reading Ruler is open source under the Open Source license.

Back to the index

Reading Ruler

Name: Reading Ruler
Author: orentrutner

github.comBrowser DevTools & extensions

Reading Ruler is an open-source Firefox browser extension that highlights or marks the current line of text to make reading web pages easier. It is intended for users who lose their place or need additional visual guidance while reading.

Open SourceWebEmbeddable

Visit github.com

1alternative

4features

2020since

Overview

4 features

Reading Ruler is a Browser DevTools & extensions project. It focuses on losing your place while reading dense or lengthy text in a browser. It is built as an open-source project for people who read long-form web content. The project is open source (Open Source). Reading Ruler is available on the web and embeddable surfaces.

Behind Reading Ruler is orentrutner, and it first shipped in 2020. Among its 4 catalogued features are reading ruler, line highlighting, and text tracking.

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

Reading ruler
Line highlighting
Text tracking
Firefox support

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

Indexed9 Sept · 04:13 UTC
Reading Ruler verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Reading Ruler

What is Reading Ruler?: Reading Ruler focuses on losing your place while reading dense or lengthy text in a browser. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use Reading Ruler?: Reading Ruler is an open-source project built for people who read long-form web content.
Does Reading Ruler have a free plan?: Yes — Reading Ruler is open source under the Open Source license and free to use.
What platforms does Reading Ruler run on?: Reading Ruler runs on the web and embeddable surfaces.
Is Reading Ruler still maintained?: Unverified. Reading Ruler 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 Reading Ruler?: Reading Ruler is developed by orentrutner.
When did Reading Ruler launch?: Reading Ruler first shipped in 2020.
Is Reading Ruler open source?: Yes — Reading Ruler is open source under the Open Source license.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
First seen: 9 Sept 2026
Built for: people who read long-form web content
Model: Open source
Solves: Losing your place while reading dense or lengthy text in a browser.

Registered as

Firefox Add-ons: readingruler

Developer

orentrutner

Index record

Indexed: 9 Sept 2026
Lifecycle: Alive
First seen: Sept 2026
Last seen: 9 Sept 2026

Identity audit (13)

Slug: reading-ruler-github-com
Lifecycle state recorded: 9 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 9 Sept 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
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: 9 Sept 2026
Canonical URL: https://github.com/orentrutner/reading-ruler

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