Prompt Grammar AI by Comss

AI-powered grammar correction, text improvement, and full-page translation via OpenRouter or Google Gemini. Your API key is stored locally in your browser and never leaves it.

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About this extension

Prompt Grammar AI is a fork of Language Improver by Dhananjay Kumar, extended under the Mozilla Public License 2.0.

Select any text and use the right-click menu to improve writing, fix grammar, or translate it in place. A separate option translates the entire page, including dynamically loaded content such as infinite-scroll feeds.

Added in this fork (compared to the original Language Improver):

Full-page translation with MutationObserver — works on infinite-scroll feeds and single-page apps
Google Gemini API support alongside OpenRouter (200+ models)
Per-function customizable prompt templates
Correct multilingual behavior — grammar and style improvements stay in the original language, no forced English output
New in 2.1.0: Google AI Mode — opens selected text in Google AI search in a background tab, no API key needed
New in 2.1.0: Custom Prompt — define any instruction; the AI follows it exactly; HTML output is inserted as real HTML in editable fields (e.g. CKEditor)
Requires an API key from openrouter.ai or aistudio.google.com. Both offer free tiers.

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Prompt Grammar AI by Comss

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