Grammarly Review
AI writing assistant for grammar, clarity, tone, and brand consistency across every platform you write on
Grammarly is the default writing assistant for good reason: it integrates into virtually everything (Google Docs, Gmail, Slack, Word, LinkedIn), catches errors in real time, and its Pro tier adds full sentence rewrites, tone adjustment, and plagiarism detection. The catch is pricing: at $30/month billed monthly or $12/month billed annually per member, it is expensive relative to the actual ROI for casual users. Teams with high writing volume and brand consistency requirements get genuine value. Solo users writing occasionally should try the free plan first.
Pros and cons
- Works across 500,000+ apps and websites via browser extension, desktop app, and mobile
- Free plan covers grammar and spelling with no character limits
- Pro includes full paragraph rewrites, tone suggestions, and plagiarism and AI detection
- Enterprise tier adds style guides, brand tones, and team analytics for consistent voice at scale
- Trusted by 50,000 organizations and 40 million users, with documented ROI cases
- Pro is $30/month billed monthly, which is steep for individual users relative to alternatives
- AI content generation is capped at 100 prompts/month on Free and 2,000 on Pro
- Pricing is shown in EUR on their site which can confuse USD buyers
- No built-in SEO optimization or content scoring for search performance
What is Grammarly?
Grammarly is an AI writing assistant that works across the web and desktop to correct grammar, improve clarity, suggest tone adjustments, and rewrite sentences. It started as a grammar checker and has expanded into a full writing support platform with AI generation, plagiarism detection, AI content detection, and team-level brand tools.
The core product is a browser extension and desktop app that sits alongside your existing writing tools. It does not replace your editor: it augments it. When you write an email in Gmail, a post in LinkedIn, a document in Google Docs, or a message in Slack, Grammarly surfaces suggestions inline. On Pro and Enterprise plans, it can rewrite full paragraphs and track whether your output aligns with a defined brand tone.
For enterprise teams, Grammarly has moved well beyond individual writing help. The Enterprise tier includes SAML SSO, data loss prevention, style guides, analytics dashboards, and dedicated support. Organizations using Grammarly at scale report meaningful time savings: one documented case saved $210,000 in the first nine months, another cut editing time by 50%. That is the audience Grammarly is increasingly designed for.
Core features
Real-Time Grammar and Clarity Suggestions
Grammarly's foundational feature watches your writing as you type and flags grammar errors, spelling mistakes, unclear phrasing, and structural issues. Suggestions appear inline and can be accepted with a click. This works across the browser extension, desktop app, Microsoft Word plugin, and Google Docs integration on all plans including free.
Full Paragraph Rewrites
On Pro and Enterprise plans, Grammarly can rewrite entire paragraphs to improve clarity, flow, and conciseness. You accept the rewrite with one click. This goes beyond sentence-level fixes and is the feature that most differentiates Pro from the free tier for users generating meaningful content volume.
Tone Detection and Adjustment
Grammarly reads the tone of what you write and tells you how it is likely to come across. Pro users can adjust tone by choosing a target (confident, formal, friendly, etc.) and accepting suggestions. Enterprise accounts can define custom brand tones that every team member writes toward, ensuring consistency across customer-facing communications.
Plagiarism and AI Content Detection
Pro plans include a plagiarism checker that scans against a large database of web content. The AI Detector agent flags sections of text that read as AI-generated and highlights where human revision would strengthen the piece. Both run inside the editor without leaving the platform.
Enterprise Style Guides and Brand Tones
Enterprise customers can create unlimited style guides and brand tones that apply across all team writing. When a writer deviates from a defined style, Grammarly flags it. Combined with the analytics dashboard (which tracks writing quality scores by team and individual), this gives content operations leaders visibility they do not get from basic grammar tools.
Pricing
| Feature | Free $0/mo | Pro $12/mo (annual) | Enterprise Contact sales |
|---|---|---|---|
| Grammar and spelling corrections | ✓ | ✓ | ✓ |
| Tone detection | ✓ | ✓ | ✓ |
| Tone adjustment | ✗ | ✓ | ✓ |
| Full paragraph rewrites | ✗ | ✓ | ✓ |
| Plagiarism and AI detection | ✗ | ✓ | ✓ |
| AI text generation prompts | 100/mo | 2,000/mo | Unlimited |
| Style guides | ✗ | 1 | Unlimited |
| Brand tones | ✗ | 1 | Unlimited |
| SAML SSO and data loss prevention | ✗ | ✗ | ✓ |
Who it is for
A manager, salesperson, or customer success rep who writes dozens of emails, Slack messages, and docs each week. Grammarly's browser extension works inside every tool they already use without requiring a workflow change. Pro's tone adjustment prevents miscommunication on high-stakes messages.
Someone responsible for brand voice consistency across a team that writes at volume. Enterprise style guides and brand tones mean every writer is corrected toward the same standard automatically, without manual review of every draft.
A professional writing in English as a second or third language who needs confidence that their communication is grammatically sound and appropriately toned. Grammarly's free tier handles this use case without cost, and Pro adds fluency improvements designed specifically for this audience.
Verdict
Grammarly earns its reputation as the default writing assistant because it is genuinely useful across the widest range of writing contexts. The browser extension is the real product: it goes where you go. Free is enough for individuals who just need error correction. Pro at $12/month annually is worth it for anyone writing customer-facing content regularly. Enterprise is a legitimate investment for content teams at scale, with documented organizational ROI. The main complaint is pricing at monthly rates, which feels hard to justify versus annual.
Frequently asked questions
Is Grammarly free?
Yes, Grammarly has a free plan that covers grammar, spelling, and basic tone detection with no character limits. It works in the browser extension, Google Docs, and Gmail. AI text generation is capped at 100 prompts per month on the free plan.
How much does Grammarly Pro cost?
Grammarly Pro is $12 per member per month when billed annually, or $30 per member per month when billed monthly. It adds full paragraph rewrites, tone adjustment, plagiarism detection, AI content detection, and 2,000 AI generation prompts per month.
Does Grammarly work in Google Docs and Gmail?
Yes. Grammarly integrates with Google Docs and Gmail through the browser extension on Chrome, Firefox, Safari, and Edge. It also has a standalone desktop app and Word plugin for Microsoft Office users.
Is Grammarly safe for confidential content?
Grammarly states it does not sell or monetize user content and does not allow third-party service providers to train their models on user content. Enterprise accounts get additional controls including confidential mode, BYOK encryption, and data loss prevention.
Can Grammarly help maintain consistent brand voice across a team?
Yes, but only on Enterprise. That tier supports unlimited style guides and brand tones that apply corrections and suggestions to every team member's writing. Pro supports one style guide and one brand tone.