Grammarly
The world's most widely used AI writing assistant with over 40 million daily users, offering real-time grammar, tone, and style corrections across 500,000+ apps and websites.
Professionals and teams who need polished, error-free writing across all communication channels with minimal learning curve
Our Verdict
The world's most widely used AI writing assistant with over 40 million daily users, offering real-time grammar, tone, and style corrections across 500,000+ apps and websites.
Rating Breakdown
Why Trust This Review
Our team has spent 40+ hours hands-on testing Grammarly across real-world scenarios. We follow a rigorous methodology with weighted scoring criteria. Our reviews are editorially independent and never influenced by affiliate partnerships.
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Pros & Cons
Pros
- Works across 500,000+ apps and websites including Gmail, Outlook, Slack, and Google Docs
- Powerful free plan that catches grammar, spelling, and basic tone issues
- Exceptionally affordable Pro plan at just $12/month with advanced features
- Zero learning curve — installs in seconds and works invisibly in your workflow
- Enterprise-grade security with SAML SSO and advanced admin controls for teams
Cons
- Only supports English, limiting usefulness for multilingual teams
- Advanced AI features locked behind the Pro paywall can feel frustrating
- Not designed for content generation from scratch — focuses on editing and polishing existing text
Full Review
Overview
Grammarly is the definitive AI writing assistant, serving over 40 million daily users and tens of thousands of teams globally. What started as a grammar checker has evolved into a comprehensive AI communication platform that works across virtually every app and website you use — from Gmail and Outlook to Slack, Google Docs, and Microsoft Word. The company, founded in 2009 and rebranded under parent company Superhuman Platform Inc. in 2025, has raised over $1.4 billion in funding, signaling serious enterprise ambitions.
Key Strengths
Grammarly's greatest asset is its ubiquity. The browser extension, desktop app, and mobile keyboard ensure your writing is polished everywhere, not just in your email client. For email specifically, Grammarly excels at catching grammar errors, suggesting tone adjustments, providing full-sentence rewrites, and detecting plagiarism. The generative AI features (available with 2,000 prompts per member per month on Pro) allow users to draft new content, brainstorm ideas, and rewrite text from short prompts. Enterprise users benefit from custom style guides, brand tones, knowledge sharing, and analytics dashboards.
Pricing Analysis
Grammarly's pricing is exceptionally competitive. The free plan provides robust basic grammar and spelling checks that alone outperform many paid alternatives. The Pro plan costs just $12/member/month when billed annually ($30/month monthly), adding tone adjustments, full-sentence rewrites, plagiarism detection, and 2,000 AI prompts. The Enterprise plan offers custom pricing with unlimited AI prompts, advanced security, SAML SSO, and dedicated support. This makes Grammarly one of the best value propositions in the AI writing space.
Who Is It Best For?
Grammarly is ideal for virtually anyone who writes emails professionally. Its universal compatibility means it improves your writing across every platform without changing your workflow. It is particularly strong for professionals who need error-free, polished communication and teams that want consistent writing quality without a steep learning curve.
The Bottom Line
Grammarly earns its place as the most essential AI email writing assistant. Its combination of universal compatibility, powerful free tier, affordable Pro pricing, and enterprise-grade features make it the one tool that belongs in every professional's toolkit. While it may not offer the specialized sales coaching of Lavender or the content generation power of Jasper, Grammarly's all-encompassing approach to writing quality is unmatched.
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Written by
Emily brings 7 years of data-driven marketing expertise, specializing in market analysis, email optimization, and AI-powered marketing tools. She combines quantitative research with practical recommendations, focusing on ROI benchmarks and emerging trends across the SaaS landscape.
Co-written by
Sarah has spent 10+ years in marketing technology, working with companies from early-stage startups to Fortune 500 enterprises. She specializes in evaluating automation platforms, CRM integrations, and lead generation tools. Her reviews focus on real-world business impact and ROI.
Final Verdict
Grammarly scores 9.0/10
With a score of 9.0 out of 10, Grammarly is an exceptional tool that leads the market. It's particularly well-suited for those looking for professionals and teams who need polished, error-free writing across all communication channels with minimal learning curve.