# Grammar and Spell Checker - LanguageTool

> With this extension you can check text with the style and grammar checker LanguageTool. It finds many errors that a simple spell checker cannot detect, like mixing up there/their, a/an, or repeating a word.

Canonical page: [https://chrome-stats.com/d/languagetool](https://chrome-stats.com/d/languagetool)

## Overview

- **ID:** `languagetool`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** LanguageTooler GmbH
- **Category:** language-support,social-communication
- **Daily users:** 331,558
- **Weekly downloads:** 2,991
- **Rating:** 4.39 / 5 (5,299 ratings)
- **Version:** 11.3.1
- **Last updated:** 2026-08-20
- **First published:** 2016-06-10
- **Size:** 15 MB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/languagetool/)
- **Website:** [https://languagetool.org/](https://languagetool.org/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/languagetool/privacy/](https://addons.mozilla.org/firefox/addon/languagetool/privacy/)

## Description

Check your text across the web for grammar and spelling with LanguageTool. This extension catches errors that simple spell checkers miss, offers style suggestions, and supports 25+ languages. It works on Gmail, Facebook, X/Twitter, LinkedIn, and more, with no registration required.

LanguageTool provides American vs. British English variants, a personal dictionary, and privacy-conscious checks (no IP address stored). It analyzes text as you type and helps elevate your writing across many languages, making it useful for both native and non-native speakers.

## Rankings

- #47 — Overall
- #9 — Language Support
- #19 — Social & Communication
- #1 — ai spell checker
- #1 — ai spelling checker
- #1 — grammar & spelling

## Permissions and access

### Permissions

- `activeTab`
- `storage`
- `contextMenus`
- `scripting`
- `alarms`

### Content script matches

- `*`
- ``
- `docs.google.com`
- `languagetool.org`
- `localhost`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension was recently updated in the past month. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

Users broadly praise Grammar and Spell Checker for being useful and grammar-aware, with features like custom sources and multilingual support. However, recurring concerns include heavy RAM usage causing browser crashes, occasional reliability problems, and occasional UI conflicts with other extensions.

### Pros

- Very useful, offering strong grammar understanding beyond a basic spell checker.
- Unobtrusive in the browser, staying out of the way while you type.
- Supports custom sources for checks.
- Appears free for users (at least to some reviewers).
- Strong language support, with positive notes about Catalan (and other languages).

### Cons

- High RAM usage leading to browser crashes (reported by multiple users).
- Occasional reliability issues (false positives or missing mistakes) in some cases.
- UI conflicts with other extensions (e.g., overlapping with the DeepL button).

## Similar extensions and apps

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Source: [Chrome-Stats](https://chrome-stats.com/d/languagetool)