Grammarly

Grammarly is the AI writing assistant used by more than 40 million people and 70,000 professional teams worldwide. It works everywhere you write — in Gmail, Google Docs, Word, Slack, LinkedIn, your browser, and native desktop apps — providing real-time suggestions that go far beyond spell-checking to improve clarity, tone, conciseness, and impact.

At its core, Grammarly detects grammar errors, punctuation mistakes, and awkward phrasing, but the more powerful features are about communication effectiveness. The Clarity and Engagement suggestions restructure confusing sentences, cut filler words, and make writing more direct. The Tone Detector analyzes how your message might land emotionally — invaluable for professional emails, customer communications, and performance feedback.

Grammarly’s AI features, powered by its own models and integrated with ChatGPT, can rewrite sentences or paragraphs, adjust the formality level for different audiences, generate email replies from brief notes, and summarize long documents. The Plagiarism Checker scans against billions of web pages.

For teams, Grammarly Business provides shared style guides and brand voice configurations, ensuring all communications follow consistent standards. Admins can set company-specific vocabulary, flag unwanted phrases, and monitor writing quality across the organization.

Grammarly Free covers essential corrections. Premium ($12/month) unlocks all advanced suggestions and the full AI rewriting suite. Business plans start at $15/user/month.