Grammarly Review: The Free Grammar Checker Everyone Should Have
TL;DR: Grammarly’s free plan is one of the most generous in all of software: unlimited grammar, spelling, and punctuation checking with no word-count cap, plus tone detection and 100 generative AI prompts a month — free forever. It won’t write your content for you, but as a safety net under everything you write, nothing free comes close.
What Grammarly Is
Grammarly is an AI writing assistant that works everywhere you type — browser extension, desktop apps, mobile keyboard, Microsoft Office, Google Docs — checking your grammar, spelling, and punctuation in real time across more than 500,000 websites and apps. In 2026 it restructured its lineup into Free, Pro, and Enterprise, and expanded well beyond proofreading into AI agents for paraphrasing, citations, reader-reaction prediction, and academic feedback.
With 30+ million daily users, Grammarly is the default writing checker the way Google is the default search engine. Based on specs, pricing, and user reviews, its core advantage is ubiquity and reliability: it catches the errors human eyes skip, works in essentially every app, and the free tier is so capable that many people never need to pay.
What’s Actually Free
Grammarly Free costs $0 with no time limit. Free-tier details verified October 2026:
| Free plan includes | Limit |
|---|---|
| Grammar, spelling, punctuation checks | Unlimited word count |
| Generative AI prompts | 100/month |
| Tone detection | Basic, included |
| Browser extension / mobile keyboard | Included |
| Weekly writing statistics | Included |
| Credit card required | No |
The standout is the unlimited word count: you can paste a 20,000-word draft into Grammarly Free and get baseline corrections without hitting a paywall — something competitor free tiers (like ProWritingAid’s 500-word cap) can’t touch. Pro costs $12/month billed annually ($144/year) or $30/month billed monthly, adding full-sentence rewrites, advanced tone control, plagiarism and AI-text detection, and 2,000 AI prompts per member per month.
Key Features
Real-time grammar and spelling. The core engine underlines errors as you type and offers one-click fixes — critical errors, not just squiggles you’ll ignore.
Generative AI assistant. The free plan includes 100 AI prompts a month for rewriting, shortening, brainstorming, and drafting — a meaningful (if capped) taste of AI writing help.
Tone detector. Flags when your message sounds too harsh, uncertain, or informal before you hit send — genuinely useful for work email.
Works everywhere. Chrome, Edge, Firefox, Safari extensions; iOS and Android keyboards; native Office and Google Docs integration. Your corrections follow you.
AI agents (Pro-leaning). Specialized agents for proofreading, paraphrasing, citation finding, and reader-reaction prediction extend Grammarly beyond checking into coaching.
20+ language support. Real-time assistance now spans 20+ languages, with basic grammar and spelling across the full set.
Pros and Cons
Pros:
- Unlimited word count on free — unmatched in the category
- Works in virtually every app you write in
- 100 free AI prompts/month is a real allowance, not a teaser
- Trusted by 30M+ daily users; mature, stable product
- No credit card, no trial expiry
Cons:
- Free tier lacks advanced clarity, vocabulary, and full-sentence rewrite suggestions
- No plagiarism or AI-text detection on free
- 100 AI prompts/month runs out fast for heavy AI drafters
- No middle tier — it’s free or the full $12–30/month Pro price
- Can feel naggy if you write in a deliberately informal voice
Who It’s Best For
Grammarly Free is for literally everyone who writes in English: students, job seekers, professionals, non-native speakers, and anyone sending emails that matter. It’s the rare tool where the honest advice is “install it even if you never pay.” It fits less well as a content generator — if you want AI to draft from scratch, pair it with a generator like Rytr or Copy.ai and let Grammarly polish the output.
FAQ
Is Grammarly really free?
Yes — the free plan is $0 forever with unlimited basic grammar, spelling, and punctuation checks. No credit card required.
What do the 100 free AI prompts cover?
Generative actions like rewrite, shorten, brainstorm, and draft — each use counts as one prompt. When you run out, basic checking keeps working unlimited.
Is Grammarly better than ChatGPT for proofreading?
For inline, as-you-type correction across all your apps, yes — ChatGPT can’t live inside your email client. For deep rewriting of a finished draft, they’re complementary.
Does Grammarly sell my data?
Grammarly states it doesn’t sell personal data; text is processed to provide corrections. Enterprise tiers add bring-your-own-key encryption for the cautious.
Can students get Pro free?
Not individually, but many schools buy Grammarly for Education institution-wide — check if yours does before paying.
How Grammarly Compares on the Free Tier
The closest free alternative is ProWritingAid, which offers deeper style reports — but its free tier caps checks at 500 words and limits AI rephrases, making it a demo where Grammarly is a daily driver. LanguageTool is another free option with solid grammar checking, though its AI rewrite features sit behind paywalls. Neither matches Grammarly’s combination of unlimited basic checking, 100 monthly AI prompts, and everywhere-you-type coverage. That’s why the standard advice holds: install Grammarly Free regardless of what else you use.
Bottom Line
Grammarly Free is the closest thing to a must-install in AI writing: unlimited proofreading, a useful AI allowance, zero cost, zero catch. It won’t replace a dedicated AI drafter, but as the always-on editor behind everything you write, it’s the highest-value free tier on this list.