Grammarly

Grammarly is an AI writing assistant that works everywhere you type—email, documents, social media, messaging apps. It checks grammar, spelling, punctuation, and tone in real-time while you write. What sets it apart is its ability to understand context and suggest not just corrections but stylistic improvements, rewrites, and tone adjustments. It learns your writing patterns and can enforce brand voice and style guides for teams.

Highlights

• Real-time grammar, spelling and clarity checks across web browsers and desktop apps
• Tone detection and adjustment suggestions for professional, friendly, confident or other voices
• AI-powered rewrites and full sentence suggestions while preserving your original meaning
• Brand voice and style guide enforcement for enterprise teams
• Plagiarism detection in premium tiers

Grammarly's free plan covers basic grammar and spelling. The premium subscription adds advanced suggestions, tone analysis and plagiarism checking. It's popular with professionals, students, and remote teams who want to improve written communication across all platforms. Pricing starts around $12/month or less with annual billing.