Grammarly

Grammarly is the world's most widely used AI writing assistant, with over 30 million daily active users spanning individual writers, business professionals, and students. Founded in 2009, Grammarly pioneered the category of AI-powered grammar and style checking before large language models made generative AI mainstream. In 2026, Grammarly has evolved beyond spell-checking into a comprehensive writing intelligence platform: real-time grammar, style, clarity, and tone suggestions across every platform where you write — browser, desktop apps, mobile, and directly in Microsoft Office and Google Docs.

Key Use Cases

Professional business writing: Grammarly analyzes your writing for clarity, conciseness, and professional tone in real time. The business-specific version detects industry-specific jargon, ensures consistent terminology, and flags communication issues before they reach clients or senior stakeholders. Email communication: Grammarly's browser extension works inside Gmail, Outlook Web, and every web-based email client — catching errors and suggesting tone adjustments before you hit send. The tone detector warns when an email sounds more aggressive or passive than intended. Academic writing: Grammarly Education detects plagiarism, checks citation formatting, and provides detailed explanations of every suggested correction — making it a learning tool, not just an error fixer. Cross-platform consistency: Whether writing in Google Docs, Microsoft Word, Slack, Twitter, LinkedIn, or any website, Grammarly provides consistent writing assistance without changing the tool where you work. Team writing consistency: Grammarly Business lets teams define style guides and brand voice rules that Grammarly enforces across all team members' writing — ensuring consistent terminology, tone, and style in customer communications.

Who It's Best For

Business professionals writing client communications, reports, and executive messaging where errors have professional consequences. Non-native English speakers who benefit from real-time grammar and idiom assistance. Students and academics who need plagiarism detection and grammar learning alongside corrections. Marketing and customer success teams maintaining consistent brand voice across high-volume written communications. Anyone who writes in English professionally and wants a reliable safety net for errors and tone.

Pricing

Free: Basic grammar and spelling corrections, limited suggestions, works across platforms. Covers most essential checking needs. Grammarly Premium — $12/month (annual): Full clarity, conciseness, engagement, and delivery suggestions; tone detection; plagiarism detection against 16 billion web pages; word choice and vocabulary enhancement. Grammarly Business — $15/user/month (annual, 3+ users): Adds team style guides, brand tone consistency enforcement, snippets for shared saved phrases, analytics, and centralized billing. Grammarly for Education: Institution pricing with enhanced plagiarism detection and classroom features.

How It Compares

vs QuillBot: Grammarly is stronger for error correction and professional writing polish; QuillBot is stronger for paraphrasing and rewriting existing text in different styles. vs Microsoft Editor: Grammarly provides more comprehensive suggestions across more platforms; Microsoft Editor is free and integrated into Office 365. vs Hemingway Editor: Grammarly checks errors and style in real time; Hemingway focuses specifically on readability and brevity without error correction.