Grammarly vs Agent 365
Detailed side-by-side comparison to help you choose the right tool
Grammarly
🟢No CodeAI Development Platforms
AI-powered writing assistant providing real-time grammar checking, tone detection, plagiarism scanning, and generative AI features across 500,000+ apps for professionals, students, and teams.
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$0Agent 365
AI Development Platforms
Microsoft Agent 365 is a control plane for managing, securing, and governing AI agents across an organization.
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CustomFeature Comparison
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Grammarly - Pros & Cons
Pros
- ✓Works seamlessly across 500,000+ apps and websites including Gmail, Google Docs, Microsoft Word, Slack, and Notion with no copy-pasting or workflow disruption required
- ✓Real-time grammar, spelling, and punctuation checking with contextually accurate suggestions that catch 97% of critical errors in independent testing
- ✓Tone detection and audience-aware feedback help align writing with intent (formal, friendly, confident, diplomatic) before hitting send, analyzing 40+ tonal qualities
- ✓Generative AI features (GrammarlyGO) can draft, rewrite, shorten, expand, and reply to messages with 1,000 monthly prompts on Pro, reducing writing time by up to 30%
- ✓Strong free tier covering core grammar and spelling needs makes it accessible without commitment, with no word count limits or time restrictions on basic features
- ✓Enterprise-grade security with SOC 2 Type 2 compliance, SAML SSO, and centralized admin controls ensures sensitive business communications remain protected
Cons
- ✗Pro and Enterprise pricing is higher than competitors like ProWritingAid or LanguageTool, with Pro at $12/month annual ($30 monthly) compared to ProWritingAid's $10/month lifetime option
- ✗Suggestions can be overly aggressive or stylistically opinionated, sometimes flagging intentional creative choices or industry-specific terminology as errors requiring manual dismissal
- ✗Limited support for languages other than English — users writing in Spanish, French, German, or other languages get minimal grammar checking compared to dedicated multilingual tools like LanguageTool
- ✗Plagiarism checker, while convenient, is less comprehensive than dedicated academic tools like Turnitin and may miss paraphrased content or sources behind paywalls
- ✗Browser extension can occasionally conflict with rich text editors, cause lag in document-heavy applications like Notion or Confluence, or interfere with custom text formatting in web apps
Agent 365 - Pros & Cons
Pros
- ✓Provides a single registry that catalogs every AI agent running across Copilot Studio, Azure AI Foundry, and third-party platforms in a Microsoft 365 tenant
- ✓Extends existing Microsoft Entra identity, Conditional Access, and Zero Trust policies to AI agents without requiring a separate identity stack
- ✓Native integration with Microsoft Purview means data loss prevention, sensitivity labels, and audit logs already cover agent activity from day one
- ✓Microsoft Defender coverage applies threat detection and response to agent behavior, addressing prompt injection and data exfiltration risks
- ✓Designed for the 400M+ Microsoft 365 commercial seats, so most enterprises can deploy without a net-new vendor procurement cycle
- ✓Backed by Microsoft's enterprise SLA, FedRAMP, and global compliance certifications already in place for the rest of the M365 stack
Cons
- ✗Enterprise-only licensing with no public pricing or self-serve tier — small teams and individual developers cannot evaluate it
- ✗Heavily optimized for Microsoft-built agents; governance depth for non-Microsoft agent frameworks (LangChain, CrewAI, custom Python agents) is more limited at launch
- ✗Requires existing investment in Microsoft Entra, Purview, and Defender to unlock the full governance value — standalone deployment offers diminished benefits
- ✗Newly announced in late 2025, so production references, third-party reviews, and long-term reliability data are still limited
- ✗Adds another administrative surface for IT teams to learn and operate alongside the existing M365 admin centers
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