Microsoft Word AI Rewriter vs Grammarly
Detailed side-by-side comparison to help you choose the right tool
Microsoft Word AI Rewriter
AI Development Platforms
AI-powered rewriter and paraphraser built into Microsoft Word with Copilot that helps users improve and rephrase their text.
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Starting Price
CustomGrammarly
🟢No CodeAI Writing Tools
Grammarly is still one of the most practical AI writing tools because it sits where writing actually happens: browser fields, documents, email, desktop apps, and business systems. The current homepage positions Grammarly as “free AI writing
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💡 Our Take
Choose Microsoft Word AI Rewriter if you already live in Word and need deep generative rewriting with enterprise data protection at $30/user/month. Choose Grammarly if you want cross-app coverage (browser, email, Slack, Docs) with a strong free tier and premium at around $12/month focused on grammar and clarity rather than full paragraph regeneration.
Microsoft Word AI Rewriter - Pros & Cons
Pros
- ✓Native integration with Microsoft Word — no copy/paste between apps or browser tabs
- ✓Backed by GPT-4 class models through Azure OpenAI, delivering high-quality rewrites comparable to ChatGPT Plus
- ✓Respects Word formatting, styles, tables, and tracked changes when rewriting
- ✓Enterprise-grade data protection: prompts and content are not used to train foundation models for business tenants
- ✓Available across Web, Windows, Mac, iOS, and Android versions of Word, reaching 400M+ Office 365 commercial seats
- ✓Can rewrite in multiple tones (professional, casual, concise) with a single click
Cons
- ✗Requires a paid Microsoft 365 subscription plus a Copilot for Microsoft 365 license at $30/user/month
- ✗Not available as a standalone product — you must use Word as your editor
- ✗Free or cheaper standalone paraphrasers (QuillBot, DeepL Write) handle many of the same basic tasks
- ✗Occasional over-sanitization of voice, flattening distinctive writing styles into generic corporate prose
- ✗Feature availability varies by region, language, and tenant configuration, which can confuse users
Grammarly - Pros & Cons
Pros
- ✓Works in the places people already write instead of forcing a new editor
- ✓Strong at improving drafts without replacing the writer’s voice
- ✓Useful free tier for basic grammar checks
- ✓Team style and brand controls are valuable for support and marketing teams
Cons
- ✗Can make writing sound too polished or generic if users accept every suggestion
- ✗Business pricing should be verified because checkout and seat tiers can vary
- ✗Privacy and data-handling review is important before using it with sensitive customer text
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