Grammarly

Grammarly is the world's most widely used AI writing assistant, installed by over 30 million people across browser extensions, desktop apps, mobile keyboards, and integrations with Microsoft Office, Google Docs, and Slack. Unlike AI content generators, Grammarly focuses on improving the writing you already produce — catching grammar errors, suggesting tone adjustments, detecting plagiarism, and offering AI-powered rewrites to make your existing text clearer and more effective. The platform operates as an always-on writing layer that works wherever you type: emails, documents, social media posts, chat messages, and code comments. Grammarly's tone detector analyzes your text and shows how it is likely to be perceived by readers, helping you adjust formality, confidence, and friendliness before hitting send. The Premium plan adds full writing feedback with sentence restructuring suggestions, vocabulary enhancement, and plagiarism detection against billions of web pages. The Business plan introduces brand tones for team-wide writing consistency, analytics dashboards showing team writing metrics, and centralized admin controls. At $12/month for Premium, Grammarly is significantly more affordable than content generation tools because it serves a different purpose: it does not write content from scratch but makes everything you write more polished, professional, and error-free. For anyone who writes professionally in English, Grammarly has become as essential as spell check.