Grammarly

Grammarly is the most widely used AI writing assistant, checking grammar, spelling, tone, and clarity across every platform where you write. Its browser extension and desktop app surface suggestions in real time inside Gmail, Google Docs, Slack, and hundreds of other apps.

Key Features

• Real-time grammar, spelling, and punctuation correction
• Tone detection and suggestions to match your intended voice
• Clarity rewrites for concise, direct sentences
• Plagiarism checker against 16 billion web pages (Premium)
• Generative AI for drafting emails, messages, and documents
• Works across 500,000+ apps via browser extension

Pricing: Free tier with basic corrections; Premium at $12/month; Business plans available.