Grammarly has become the world's most popular writing assistant, helping over 30 million users daily to communicate more effectively. Beyond basic spell checking, Grammarly analyzes your writing for clarity, engagement, delivery, and tone using advanced AI and natural language processing. The tool integrates seamlessly with browsers, Microsoft Office, email clients, and mobile keyboards. Its premium version offers vocabulary enhancement suggestions, plagiarism detection, and genre-specific writing style checks. Whether you're writing a casual email or a formal business proposal, Grammarly adapts its suggestions to match your intended tone and audience.
The free plan covers grammar and spelling only — clarity, tone, and rewrite suggestions require Premium.
Book-length manuscripts — structural style reports like ProWritingAid are deeper for long documents.
Compared to ProWritingAid, Grammarly is better in real time everywhere; ProWritingAid is deeper for long-form analysis.
The best real-time writing assistant for everyday professional writing — Premium earns it if you write daily.
Based on Grammarly official plan documentation as of June 2026.