Grammarly is the most widely used AI writing assistant, installed by over 30 million users. It checks grammar, spelling, punctuation, and style in real-time across virtually every text input — email, docs, social media, Slack, and more. The AI goes beyond surface-level corrections to suggest structural improvements, tone adjustments, and clarity enhancements. Grammarly's generative AI features let you compose, rewrite, and ideate directly within your workflow. You can change the tone of an email from casual to professional, expand bullet points into full paragraphs, or generate first drafts from prompts. The tool learns your personal writing style and preferences over time. The free tier handles core grammar and spelling. Premium adds advanced suggestions for clarity, engagement, and delivery. Business plans add team analytics, style guides, brand tones, and admin controls. Grammarly works as a browser extension, desktop app, keyboard (mobile), and plugin for Microsoft Office and Google Docs.

What the community says

Grammarly maintains very high satisfaction scores — over 94% positive sentiment from more than 14,000 verified reviews — with users consistently praising its real-time grammar, punctuation, and style correction. The tool excels at polishing existing writing but receives more mixed reviews for AI content generation, which users describe as 'rather basic' compared to ChatGPT at a similar price point. The September 2025 AI Humanizer launch generated skepticism: independent testing showed Grammarly-humanized content still scoring 72-88% AI-generated on external detectors. A prompt limit even for paid users and some controversy around the Expert Review feature mimicking authors' styles draw criticism from power users. Based on community discussions from Reddit, Capterra, and writing tool review sites over the past 12 months.