Grammarly vs Microsoft Word AI Rewriter
Detailed side-by-side comparison to help you choose the right tool
Grammarly
đĸNo CodeWriting Tools
AI-powered writing assistant providing real-time grammar checking, tone detection, style improvements, plagiarism detection, and generative AI features across emails, documents, and web applications.
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Starting Price
$0Microsoft Word AI Rewriter
Writing & Editing
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
CustomFeature Comparison
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đĄ 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.
Grammarly - Pros & Cons
Pros
- âHighly accurate grammar and spelling detection that catches nuanced errors most tools miss
- âSeamless integration across 500,000+ platforms â browser, desktop, mobile, Office, Google Docs, Slack
- âGenerous free tier with basic grammar checking and 100 monthly AI prompts
- âGrammarlyGO generative AI works inside existing apps â no copy-paste workflow needed
- âFull-sentence rewrites and clarity suggestions improve quality beyond simple corrections
- âReal-time tone detection prevents communication missteps in business writing
- âPlagiarism detection provides originality assurance for content creators
- âBrand voice and style guide features make it practical for team-wide deployment
- âEnterprise-grade security with SOC 2 Type II, ISO 27001, and multiple certifications
- âRegular feature updates and consistently responsive performance
Cons
- âOver-corrects creative writing â flags intentional style choices as errors
- âPro plan costs $30/month without annual commitment ($12/month requires yearly billing)
- âNo offline functionality â all suggestions require an active internet connection
- âLimited non-English language support compared to LanguageTool's 30+ languages
- âOccasional inaccurate suggestions for complex or specialized technical terminology
- âFree tier lacks plagiarism detection and advanced style features
- âNo refund or prorated cancellation policy on annual subscriptions
- âEnterprise pricing is opaque â requires sales engagement for quotes
Microsoft Word AI Rewriter - Pros & Cons
Pros
- âNative integration with Microsoft Word â no copy/paste between apps or browser tabs
- âBacked by GPT-4 class models through Azure OpenAI, delivering high-quality rewrites comparable to ChatGPT Plus
- âRespects Word formatting, styles, tables, and tracked changes when rewriting
- âEnterprise-grade data protection: prompts and content are not used to train foundation models for business tenants
- âAvailable across Web, Windows, Mac, iOS, and Android versions of Word, reaching 400M+ Office 365 commercial seats
- âCan rewrite in multiple tones (professional, casual, concise) with a single click
Cons
- âRequires a paid Microsoft 365 subscription plus a Copilot for Microsoft 365 license at $30/user/month
- âNot available as a standalone product â you must use Word as your editor
- âFree or cheaper standalone paraphrasers (QuillBot, DeepL Write) handle many of the same basic tasks
- âOccasional over-sanitization of voice, flattening distinctive writing styles into generic corporate prose
- âFeature availability varies by region, language, and tenant configuration, which can confuse users
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