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Grammarly is the AI writing assistant that checks grammar, tone, and clarity in real time across email, docs, and the web. UK professionals use the browser extension everywhere — Gmail, LinkedIn, Slack, and Notion. Free tier covers basic corrections; Premium is $12/month and adds tone adjustments, rewrites, and plagiarism checks. It integrates with Word, Google Docs, and Outlook. GDPR compliant with data processing terms. Grammarly is the default polish layer for written communication in UK businesses of every size.