The AI writing assistant that follows you across your browser and apps, fixing grammar and sharpening tone as you type.
Reviewed by Tom · Founder & lead reviewerGrammarly is a writing assistant that runs wherever you write: a browser extension covering Gmail, Google Docs, LinkedIn, and most web apps, plus desktop apps for Windows and Mac and a mobile keyboard. The free tier catches grammar, spelling, and punctuation errors. Premium adds clarity rewrites, conciseness suggestions, vocabulary variety, tone adjustments, and a plagiarism checker. The generative AI layer lets you prompt it to draft replies, shorten paragraphs, or shift tone from casual to formal in place. Because it sits at the system level rather than inside one app, your writing gets the same treatment in a Slack message as in a formal proposal. That cross-app consistency, more than any single feature, is the product's real moat and the reason people keep paying for it.
Grammarly Free is genuinely useful for basic correctness, which sets a high bar for the upgrade. Premium runs about $12 per month on annual billing - noticeably more if you pay monthly - and Business adds team features like style guides and analytics at a per-seat price. Whether Premium is worth it depends on how much of your job is judged on written polish. For client-facing professionals, non-native English speakers, and anyone whose emails carry weight, the clarity and tone features earn their keep. For everyone else, the value case has eroded: ChatGPT, Gemini in Google Workspace, and Copilot in Office all rewrite text now, often at prices you are already paying. Grammarly's answer is convenience - inline, everywhere, zero copy-paste - and that is honestly worth something, just maybe not $144 a year for every user.
Buy Grammarly Premium if writing quality directly affects your income or reputation and you write across many surfaces - sales emails, support replies, proposals, social posts - where copy-pasting into a chatbot would break your flow a dozen times a day. Non-native English speakers get some of the best value here, since the explanations teach as they correct. Stick with the free tier if you mostly need typo-catching, or skip Grammarly entirely if 90 percent of your writing happens inside Google Workspace or Microsoft 365 with AI features already enabled. One warning for distinctive writers: accept Grammarly's suggestions selectively, because wholesale acceptance sands the personality out of your prose. Trial Premium for one billing month, track how many suggestions you actually accept, and let that number make the call.
Professionals who write all day in email, docs, and chat and want every message checked without switching tools.
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