Fog Index
Fog Index is a Firefox extension that estimates the Gunning Fog readability score for pasted English text. It helps writers, editors, and content creators assess reading difficulty without collecting user data.
Overview
5 featuresFog Index sits in PulseGate's Other SEO & content category. It focuses on estimating the reading difficulty of English text using the Gunning Fog readability index. It is built as a consumer product for writers, editors, and content creators. Fog Index is free to use. Fog Index is available on the web and embeddable surfaces.
Behind Fog Index is Richard B. Thrailkill, and it first shipped in 2026. Among its 5 catalogued features are text pasting, readability scoring, and Gunning Fog index. The interface is available in 32 languages, including Czech, German, and Greek.
Summary written by a language model from the project’s public pages.
- Text pasting
- Readability scoring
- Gunning Fog index
- English text analysis
- No data collection
Built with & integrations
Trust & compliance
Indexing history
1What PulseGate has recorded for this listing
Frequently asked questions about Fog Index
- What does Fog Index do?
- Fog Index focuses on estimating the reading difficulty of English text using the Gunning Fog readability index. It is catalogued under Other SEO & content on PulseGate.
- Who should use Fog Index?
- Fog Index is a consumer product built for writers, editors, and content creators.
- Does Fog Index have a free plan?
- Yes — Fog Index is free to use.
- What platforms does Fog Index run on?
- Fog Index runs on the web and embeddable surfaces.
- Is Fog Index still maintained?
- Unverified. Fog Index 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 makes Fog Index?
- Fog Index is developed by Richard B. Thrailkill.
- How long has Fog Index been around?
- Fog Index first shipped in 2026.
- What languages does Fog Index support?
- The interface is available in 32 languages, including Czech, German, and Greek.
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