What is Grammarly?
Grammarly is an AI writing assistant that fixes grammar, spelling, tone, and clarity in real time. It works across more than one million apps and websites, including Gmail, Google Docs, Slack, LinkedIn, and Microsoft Word. Pro users can also generate text, adjust tone, and run plagiarism checks.
Key Features
- Real-time grammar, spelling, and punctuation correction across 1M+ apps and websites
- Tone detection and one-click tone adjustment for emails, messages, and documents
- Full-sentence rewrites that improve clarity, fluency, and word choice
- AI text generation – 100 prompts/month on Free, 2,000 prompts/month on Pro
- Plagiarism and AI-generated text detection (Pro only)
Pricing
| Plan | Price | Best For | Key Limitation |
| Free | $0/month | Casual users, basic grammar fixes | Capped at 100 AI prompts/month; no tone rewrites |
| Pro | $12/month (7-day free trial) | Professionals, students, small teams | Pricier than QuillBot and LanguageTool annual plans |
| Enterprise | Custom – Contact Sales | Larger organizations, regulated teams | No public pricing; only via Superhuman sales |
Verify current pricing at grammarly.com/plans.
How It’s Typically Used
For a marketing manager drafting a client proposal:
Step 1: Install the Grammarly browser extension or desktop app
Step 2: Open Google Docs and start writing the proposal
Step 3: Accept inline suggestions for grammar, clarity, and tone shifts
Step 4: Use “Rewrite” on weak sentences to get a confident, professional version
Step 5: Paste the polished draft into email or the CMS and send to the client
Pros & Cons
Pros
- Works inside 1M+ apps without copy-paste. true cross-platform coverage
- Tone detector flags unintended emotional signals before you send
- 7-day Pro trial requires no upfront payment, with reminder before billing
- Strong enterprise security: SOC 2 Type 2, BYOK encryption available
- Free plan is genuinely useful for casual writers, not just a teaser
Cons
- Pro at $12/mo costs 44% more than QuillBot annual ($8.33/mo) for narrower paraphrasing
- English-only. Multilingual users should look at LanguageTool instead
- No offline mode. Requires active internet connection for all suggestions
- Aggressive style suggestions can flatten distinctive writing voice
- No lifetime license option, unlike ProWritingAid’s $399 one-time purchase
Who It’s For
Professionals writing emails, reports, and client-facing copy in English get the most value, Grammarly catches tone issues other tools miss. Fiction writers and book authors will find it limited. It lacks the manuscript-level reports ProWritingAid offers. Bilingual or non-English writers should avoid it entirely, Grammarly only checks English in all its dialects.
Is It Worth It?
Grammarly Pro is worth it if you write 10+ professional emails or documents daily in English and work across multiple platforms (Gmail, Docs, Slack, LinkedIn). The tone detector and rewrite suggestions save real revision time, and the cross-app coverage removes copy-paste friction.
It is not worth it if you mainly need paraphrasing or work in multiple languages. QuillBot handles rewrites for less, and LanguageTool covers 30+ languages at a lower annual price.
Alternatives
The closest alternatives to Grammarly are ProWritingAid, QuillBot, and LanguageTool — each better suited to different writing styles, languages, or budgets.
| Tool | Core Strength | Best Use Case | Starting Price | Key Limitation |
| Grammarly | Cross-app real-time editing in 1M+ places | Daily professional English writing | Free; Pro $12/mo | English only; no manuscript-depth reports |
| ProWritingAid | 25+ in-depth reports for long-form writing | Authors, novelists, academic writers | Free; Premium $30/mo | Slower interface; weaker browser integration |
| QuillBot | Multi-mode paraphrasing and AI Humanizer | Students, ESL writers, rewriting tasks | Free; Premium $19.95/mo | Weaker grammar depth than Grammarly |
| LanguageTool | Grammar checking in 30+ languages | Multilingual writers, EU professionals | Free; Premium €19.90/mo | English accuracy lags Grammarly |
FAQs
Is Grammarly free to use?
Yes, Grammarly offers a permanent free plan with grammar checking, spell check, and 100 AI prompts per month. Pro unlocks tone rewrites, plagiarism checks, and 2,000 AI prompts at $12/month.
Does Grammarly work in Google Docs and Microsoft Word?
Yes, Grammarly integrates directly with Google Docs, Microsoft Word, Outlook, and more than one million other apps and websites through its browser extension and desktop apps.
Is Grammarly safe for confidential business documents?
Yes, Grammarly is SOC 2 Type 2 certified and offers enterprise-grade encryption including BYOK on the Enterprise plan. For highly sensitive legal or financial documents, the Enterprise tier’s confidential mode is required.
Grammarly vs QuillBot. Which is better for budget-conscious professionals?
QuillBot is cheaper at $8.33/month on the annual plan, but it is paraphrasing-first; Grammarly’s $12/month covers grammar, tone, plagiarism, and cross-app editing, making it the better value for full daily writing workflows.
How accurate is Grammarly’s plagiarism checker?
Grammarly’s plagiarism checker is included in the Pro plan and scans against billions of web pages and academic databases. It is reliable for catching unattributed web content but is not a substitute for institutional tools like Turnitin in academic settings.