Grammarly

Grammarly is an AI writing assistant that reviews your writing in real time, flagging grammar errors, punctuation issues, style problems, and clarity improvements. It works as a browser extension (Chrome, Firefox, Safari, Edge), a desktop app, a Microsoft Word and Outlook add-in, and a standalone web editor. As of 2025, Grammarly added full-sentence rewrites and deeper generative AI capabilities via GrammarlyGO.

What makes it distinctive: Unlike pure grammar checkers, Grammarly evaluates your writing holistically—tone, clarity, engagement, and delivery alongside grammar. It can tell you your email sounds blunt and offer a softer alternative, or flag that a paragraph relies too heavily on passive voice. The premium tier adds domain-specific style guidance (academic, technical, business) and vocabulary enhancement suggestions.

Who uses it: Students use it to polish essays, avoid errors, and learn from corrections. Professionals use it for email, reports, and presentations—especially non-native English speakers writing in a professional context. Content creators and bloggers use it for posts, social copy, and newsletters. Teams use Grammarly Business for brand voice consistency and shared style guidelines across the organization.

Pricing: Grammarly has a robust free tier covering basic grammar and spelling. Premium is $12/month billed annually and adds advanced suggestions, tone detection, clarity improvements, and GrammarlyGO generative features. Business starts at $15/user/month and includes team features and brand voice customization.

Strengths: Deeply integrated across platforms—works wherever you write online or in desktop apps. The free tier is genuinely useful and not crippled to force upgrades. Consistent and reliable for catching grammar and punctuation errors. Tone detection helps calibrate professional communication before you hit send.

Limitations: Suggestions can flatten distinctive writing voice in favor of neutral, safe style. The free tier includes aggressive upselling prompts. GrammarlyGO generative features are behind the curve compared to dedicated AI writing tools like Claude or ChatGPT. Does not handle technical writing conventions well—code blocks, scientific notation, and domain-specific style are often flagged incorrectly.

Alternatives: ProWritingAid is a strong alternative for deep structural and style feedback on long-form writing. For AI-generated content rather than editing, Claude or ChatGPT are significantly more capable. LanguageTool is a free, open-source alternative with good multilingual support. Hemingway Editor is better for readability-focused editing and grade-level targeting.