Best Grammar Checker Extensions for Chrome (Grammarly Alternatives)

Good writing matters whether you're composing a professional email, a university essay, or a social media post. A grammar checker Chrome extension works in real time across every text field in your browser, catching errors before you hit send. This guide covers Grammarly and its best alternatives so you can pick the right tool for your writing style and budget.

Why Use a Browser-Based Grammar Checker?

Word processors like Microsoft Word and Google Docs have built-in spell checkers, but they only work within those specific apps. A Chrome extension extends grammar checking to Gmail, LinkedIn, Twitter, Slack, Notion, and every other web-based writing surface — which is where most of us actually write most of our content.

1. Grammarly — The Most Popular Choice

Grammarly is the most widely used writing assistant with over 30 million daily users. The Chrome extension adds an overlay to every text input field on the web, flagging spelling errors, grammar mistakes, punctuation issues, and style problems as you type. The free version is genuinely useful; Grammarly Premium adds advanced style suggestions, vocabulary enhancement, and plagiarism detection.

Grammarly Free vs Premium

Free: Spelling, grammar, punctuation, and basic tone detection
Premium ($12/month): Clarity rewrites, word choice, formality level, plagiarism checker
Business ($15/user/month): Team style guide, account management, analytics

Grammarly Limitations

Requires an account to use
Can be overly aggressive with suggestions — not every "error" is actually wrong
Runs in the background on all sites, which raises privacy considerations for sensitive writing
The extension is relatively heavy and can slow older computers

2. LanguageTool — Best Free Grammarly Alternative

LanguageTool is an open-source grammar checker that supports over 25 languages, making it the clear choice for non-English writers. The Chrome extension works similarly to Grammarly, underlining errors in text fields across the web. The free version checks for a broad range of errors; the Premium plan ($4.99/month) adds advanced style rules, vocabulary suggestions, and longer text processing.

3. ProWritingAid

ProWritingAid goes deeper than grammar — it analyzes your writing for style, structure, and readability using 20+ different reports. The Chrome extension provides in-browser suggestions, but the full power of the tool shines in the web editor where you can run comprehensive document-level analyses. It's particularly well-regarded among fiction writers and long-form content creators.

4. Hemingway Editor (Web App, Not Extension)

Hemingway Editor doesn't have a Chrome extension, but the web app at hemingwayapp.com is worth knowing about. Paste your text and it highlights sentences that are too complex, passive voice usage, and adverb overuse. It's the best tool for simplifying dense or convoluted writing. Use it as a complement to a real-time grammar checker rather than a replacement.

5. Wordtune

Wordtune focuses on sentence rewriting rather than error correction. Select any sentence and it offers alternative phrasings with different tones (formal, casual) and lengths. It's useful when you know what you want to say but can't find the right way to say it. The free version offers a limited number of rewrites per day.

Grammarly vs LanguageTool: Which Should You Choose?

Choose Grammarly if you write primarily in English and want the most polished, user-friendly experience.
Choose LanguageTool if you write in multiple languages, want an open-source option, or need a more affordable premium plan.
Choose ProWritingAid if you write long-form content and want document-level structural analysis.

Conclusion

Grammarly is the best grammar checker Chrome extension for most English-speaking users — the free version alone will catch the majority of everyday errors. For non-English writers or those on a tighter budget, LanguageTool is an excellent alternative. Install one today and notice the improvement in your writing quality immediately.