Grammarly Free vs Pro: Do You Actually Need to Pay $30/Month?
Grammarly Free catches grammar and spelling errors and gives you 100 AI prompts per month. Pro at $30/mo (or $12/mo billed annually) adds full rewrites, plagiarism detection, brand tones, and 2,000 AI prompts. For casual writers, Free is genuinely enough. For professionals, Pro pays for itself. Here's the exact dividing line.
Singh · Founder & Lead Reviewer · March 2026
Tests software tools, tracks pricing changes weekly, and builds comparison data from first-party vendor sources.
Tested: Verified pricing from Grammarly vendor page · 2 sources verified
See our methodology →Grammarly's Pricing
| Plan | Monthly | Annual | Key Features |
|---|---|---|---|
| Free | $0 | $0 | Basic grammar/spelling, tone detection, 100 AI prompts/month |
| Pro | $30/mo | $144/yr ($12/mo) | Advanced rewrites, plagiarism detection, 2,000 AI prompts/month, brand tones |
| Enterprise | Custom | Custom | Unlimited AI prompts, SSO, SCIM, admin console, brand voice, analytics |
Critical pricing note:Pro is $30/mo monthly but $12/mo billed annually ($144/yr). That's a 60% discount for annual billing — one of the biggest monthly-to-annual gaps in SaaS. If you decide to go Pro, always choose annual.
What Grammarly Free Actually Gives You
- Grammar and spelling corrections. Catches typos, subject-verb disagreements, comma splices, and common grammar errors.
- Tone detection. Tells you if your writing sounds formal, friendly, confident, etc.
- 100 AI prompts/month. Use GrammarlyGO to rewrite sentences, adjust tone, or generate text — limited to 100 uses.
- Works everywhere. Browser extension, desktop app, mobile keyboard — all included in Free.
When to Stay on Grammarly Free
You write casually (emails, Slack messages, social media posts). You don't publish long-form content professionally. You rarely need to check for plagiarism. You use fewer than 100 AI prompts per month. For everyday writing correction, Free is genuinely enough — and it's better than most paid writing tools at catching basic errors.
What Pro Adds (And Who Needs It)
- Advanced rewrites. Full sentence and paragraph rewriting, not just corrections. Pro suggests clearer, more concise alternatives to entire passages.
- Plagiarism detection. Checks your text against billions of web pages. Essential for content marketers, students, and anyone publishing original content.
- 2,000 AI prompts/month. 20x the free limit. For writers who use GrammarlyGO regularly to adjust tone, rewrite paragraphs, or draft responses.
- Brand tones. Set custom tone profiles so AI suggestions match your brand voice.
- Vocabulary enhancement. Suggests more precise or professional word choices.
When to Upgrade: The Exact Triggers
Upgrade to Pro when:
- You publish content professionally. Blog posts, newsletters, client reports, marketing copy. Pro's advanced rewrites catch issues Free misses — wordiness, unclear structure, passive voice patterns.
- You're a non-native English speaker writing professionally. Pro's rewrite suggestions and vocabulary enhancements are dramatically more helpful than Free's basic corrections.
- You hit the 100 AI prompt limit regularly. If you use GrammarlyGO daily for rewrites and tone adjustments, 100/month runs out fast. Pro gives you 2,000.
- You need plagiarism detection. There's no way to get this on Free. If you check content originality, Pro is the minimum.
When Pro Pays for Itself
At $12/mo annually ($144/yr), Pro pays for itself if it saves you 30 minutes per month on writing tasks. For professional writers:
| Scenario | Time Saved/Month | Value at $50/hr | Pro Cost |
|---|---|---|---|
| 1 blog post/week | 2–4 hours | $100–$200 | $12/mo |
| Daily client emails | 1–2 hours | $50–$100 | $12/mo |
| Occasional social posts | 15–30 min | $12–$25 | $12/mo |
The Cheaper Alternative: ChatGPT or Claude for Writing
If your primary use of Grammarly Pro is AI-powered rewrites (not grammar checking), consider whether you already pay for ChatGPT Plus ($20/mo) or Claude Pro ($20/mo). Both include:
- Unlimited rewrites and tone adjustments. No prompt cap like Grammarly's 2,000/month.
- Long-form content generation. Write entire articles, not just fix them.
- More flexible than Grammarly's AI. Custom instructions, conversation context, and complex editing requests.
The tradeoff: ChatGPT and Claude don't integrate into every text field on your computer the way Grammarly does. Grammarly's value is passive, always-on correction everywhere you type. AI chatbots require active copy-paste workflows. For many professionals, both tools serve different purposes.
Frequently Asked Questions
Is Grammarly Free really enough for everyday use?
For casual writing — emails, Slack messages, social media — yes. Free catches grammar errors, typos, and basic tone issues. It works in your browser, desktop apps, and on mobile. Most people who try Free never need Pro.
Why is there such a big gap between monthly and annual pricing?
Grammarly Pro is $30/mo monthly but $12/mo annually — a 60% discount. This is one of the most aggressive annual discounts in SaaS. Grammarly heavily incentivizes annual commitment. If you try Pro monthly and like it, switch to annual immediately.
Does Grammarly work with Google Docs?
Yes. Grammarly integrates natively with Google Docs, Microsoft Office, Gmail, Slack, Notion, and most browser-based text editors. Both Free and Pro work everywhere.
Is Grammarly Enterprise worth it?
Enterprise pricing is custom (not published). It adds unlimited AI prompts, SSO, SCIM provisioning, admin console, brand voice across teams, and usage analytics. It makes sense for organizations with 25+ writers who need consistent brand voice and centralized management. Below that, individual Pro licenses work fine.
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