Grammarly review covering AI grammar checking, tone detection, plagiarism scanning, pricing plans and top alternatives for writers and teams in 2026.
Grammarly was founded in 2009 by Alex Shevchenko, Max Lytvyn and Dmytro Lider, evolving from earlier plagiarism-detection work into the browser-based grammar and writing assistant used by hundreds of millions of people today. The company is headquartered in San Francisco and has raised roughly 545 million dollars in disclosed venture funding at a peak valuation around 13 billion dollars, plus a further 1 billion dollar growth round in 2025.
That 2025 round accompanied acquisitions of the productivity tool Coda and the Superhuman email client, marking Grammarly's shift from a single-purpose grammar checker toward a broader AI productivity platform.
Grammarly combines rule-based grammar and spelling correction with large-language-model-powered generative writing tools, delivered inline through browser extensions, desktop apps, a mobile keyboard, and Microsoft Office and Google Docs integrations covering roughly 500,000 apps and websites.
Beyond basic corrections, it offers tone detection, full-sentence rewrites, a plagiarism and AI-content detector, and team-focused style guides and analytics for organizations standardizing writing quality across staff.
Grammarly's Free tier covers basic grammar and spelling correction plus 100 AI prompts per month. Grammarly Pro, which now replaces the former separate Premium and Business plans, costs about 12 dollars per month billed annually and supports up to 149 seats.
Larger organizations move to a custom-priced Enterprise plan that adds SSO, SCIM, data loss prevention, bring-your-own-key encryption and unlimited AI prompts per member.
Yes, Grammarly offers a Free tier with basic grammar and spelling correction and 100 AI prompts per month; advanced features require Pro or Enterprise.
Grammarly Pro is the current paid plan that replaced the former separate Premium and Business plans, supporting individuals and teams of up to 149 seats.
Yes, Grammarly offers dedicated add-ins for Google Docs and Microsoft Office alongside its browser extension and desktop apps.
Yes, Grammarly includes an AI-generated-text detector alongside its traditional plagiarism checker.
Grammarly Enterprise offers additional controls like bring-your-own-key encryption and data loss prevention for sensitive content; check the current privacy policy for individual plans.
Grammarly is a private company backed by investors including General Catalyst, BlackRock and Baillie Gifford, last valued around 13 billion dollars.