Freemium⚡ Featuredwriting

Grammarly

Catches what spellcheck always misses

AI writing assistant that checks grammar, spelling, punctuation, and style — with tone detection and clarity improvements across every app you use.

4.5

Try Grammarly Free →

Opens official website

grammareditingproofreading

About Grammarly

Grammarly is the world's most widely used AI writing assistant, with over 40 million daily active users across individuals, teams, and enterprises in 2026. What began as a grammar and spell-checker has evolved into a full AI communication platform — one that understands context, audience, tone, and intent across every surface where people write. The Grammarly browser extension works inside Gmail, Google Docs, Slack, LinkedIn, Notion, Salesforce, and over 500,000 other apps, making it the most omnipresent AI writing tool in existence. In 2026, Grammarly's AI goes far beyond fixing errors: it rewrites full sentences and paragraphs for clarity, adjusts tone from formal to casual at the click of a button, detects plagiarism against a database of billions of web pages and academic papers, flags inclusive language issues, and generates full draft emails and messages from brief prompts via Grammarly GO. For enterprise teams, Grammarly Business enforces custom style guides, brand voice consistency, and terminology standards across every employee's writing — in real time, wherever they write. Whether you're a student polishing a paper, a marketer drafting ad copy, or an executive sending board communications, Grammarly remains the most battle-tested and broadly trusted AI writing companion in the market.

✅ Pros

+Works everywhere — 500,000+ apps via browser extension, desktop app, and mobile keyboard
+Grammarly GO generates full drafts, rewrites, and replies from short prompts
+Tone detection and adjustment: instantly shift from formal to casual or vice versa
+Advanced plagiarism checker against billions of academic and web sources
+Style guide enforcement for business teams — brand voice at scale
+Inclusive language suggestions to improve communication across diverse audiences
+Detailed writing score and analytics with actionable improvement breakdowns
+Trusted by 98% of Fortune 500 companies for business communication

❌ Cons

−Free plan has significant limitations — most powerful features require Premium ($30/month)
−AI suggestions occasionally alter the original meaning of nuanced or technical writing
−Plagiarism checker only available on Premium and Business plans
−Less suited for long-form creative writing compared to dedicated tools like Jasper
−Can feel intrusive with excessive suggestions for experienced, confident writers

Key Features

Grammarly GO — AI Generation

Type a short prompt and Grammarly GO drafts full emails, Slack messages, LinkedIn posts, or document sections — matching the tone and context of wherever you're writing. Unlike standalone AI tools, it understands the surrounding conversation thread to generate contextually appropriate replies.

Universal Browser Extension

Grammarly's browser extension works across 500,000+ web apps — Gmail, Outlook, Notion, Salesforce, LinkedIn, Slack, Google Docs, and more. Real-time suggestions appear as an overlay without switching apps, making it the only AI writing tool that follows you everywhere you write.

Tone Detection & Adjustment

Grammarly detects the emotional tone of your writing (confident, direct, friendly, formal, concerned) and lets you adjust it with one click. Essential for customer communications, performance reviews, or any writing where striking the right tone matters as much as the content.

Plagiarism Checker

Checks your writing against Grammarly's database of billions of web pages and academic papers, highlighting matched passages and similarity percentages. Standard for academic writing and content marketing teams who need to ensure originality before publication.

Business Style Guide Enforcement

Enterprise and Business plan teams define custom terminology rules, banned words, preferred phrasing, and brand voice guidelines. Grammarly then enforces these standards in real time across every employee's writing — on every platform — without requiring manual review.

Inclusive Language Suggestions

Flags potentially exclusionary language around gender, race, age, disability, and other dimensions, and suggests more inclusive alternatives. Increasingly required for enterprise communications policies and DEI initiatives in 2026.

Pricing Plans

Free$0/ month

✓Basic grammar & spelling checks
✓Tone detection
✓Limited AI rewrites per month
✓Browser extension & desktop app
✓Works in Gmail, Google Docs & more

Premium$30/ month

✓Everything in Free
✓Full Grammarly GO AI generation
✓Advanced clarity & style rewrites
✓Plagiarism checker
✓Vocabulary enhancement

Business$15/ member / month

✓Everything in Premium
✓Custom style guide enforcement
✓Brand voice & tone controls
✓Team analytics dashboard
✓SAML SSO & admin console

EnterpriseCustom

✓All Business features
✓Custom AI model fine-tuning
✓Advanced security & compliance
✓Dedicated account manager
✓SLA & priority support

Prices, plan limits, and promotions may change. Verify final pricing on the official site.

🏆 Our Verdict

Grammarly remains the gold standard for AI-assisted writing in 2026 — not because it's the most powerful AI writer, but because it's the most reliable and universally available. Its browser extension works wherever you write, Grammarly GO handles AI generation for everyday communication tasks, and the Business plan's style guide enforcement is genuinely valuable for teams who care about consistent brand voice. The main caveat: the free plan is limited enough that meaningful use requires Premium at $30/month, which feels steep for individual users. But for professionals who write frequently across multiple platforms — and especially for enterprise teams — Grammarly is the highest-ROI writing tool in the market.

✅ Best For

Students & academicsBusiness professionalsMarketing & content teamsNon-native English speakersEnterprise communication teamsCustomer support & sales reps