Grammarly

Grammarly, developed by Grammarly Inc., is the world's most popular AI writing assistant with over 30 million daily active users. It's not just a grammar checker—it's a comprehensive writing assistant covering everything from spelling and grammar correction to tone adjustment, clarity optimization, style suggestions, and AI-powered writing generation. For solopreneurs, Grammarly's greatest value lies in ensuring professional external communication—whether client emails, business proposals, or social media posts, Grammarly helps you avoid embarrassing language errors. The browser extension provides real-time suggestions in any web text field, while the desktop app supports Word, Google Docs, and other document tools. Grammarly's AI rewriting feature adjusts expression for different contexts, such as converting a casual email into formal business communication. The free version covers basic grammar and spelling checks, while Premium at approximately $12/month (annual billing) provides advanced suggestions for clarity, tone, and style. The Business plan adds brand tone management and team analytics dashboards. Grammarly's main limitations: it's optimized primarily for English writing with very limited Chinese support; sometimes overly conservative suggestions may stifle writing personality; and offline functionality is unavailable. For entrepreneurs who write frequently in English, Grammarly Premium offers excellent value.