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Head-to-head · Business Ai Tools

Microsoft 365 Copilot Agent Store vs Grammarly

  • Updated Nov 2026
  • Both researched from official sources
  • 2 checks side by side
Higher score Microsoft 365 Copilot Agent Store #6 in Business Ai Tools 8.7/10 Paid ✓ 0 of 1 features Visit Microsoft
Grammarly #8 in Business Ai Tools 8.5/10 Free plan Free plan✓ 0 of 1 features Visit Grammarly

Microsoft 365 Copilot Agent Store leads on 0 checks, Grammarly on 1, and 1 is even. Who comes out ahead on the 2 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreMicrosoft 365 Copilot Agent Store · 8.7/10
  • Lowest starting priceGrammarly · $12/user/mo
  • Free planonly Grammarly

Microsoft 365 Copilot Agent Store scores higher on our rubric for business ai tools: 8.7 against 8.5 out of 10; our editors rank them #6 and #8.

Grammarly is cheaper to start at $12/user/mo against $21/user/mo.

Microsoft 365 Copilot Agent Store is the better fit for organizations standardized on Microsoft 365. Grammarly is the better fit for teams focused on polished, consistent business writing.

  • Microsoft 365 Copilot Agent Store fits best

    Organizations standardized on Microsoft 365

  • Grammarly fits best

    Teams focused on polished, consistent business writing

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Microsoft 365 Copilot Agent Store 8.7/10 Visit ↗ Grammarly 8.5/10 Visit ↗
At a glance
Editor score 8.7 8.5
Ranking #6 in Business Ai Tools #8 in Business Ai Tools
Best for Organizations standardized on Microsoft 365 Teams focused on polished, consistent business writing
Pricing model Paid Free plan + paid
Starting price $21/user/mo $12/user/mo (best)
Free plan Not checked yet ✓ (best)
Free trial — —
Deployment Cloud, Mobile, Desktop Cloud, Desktop, Mobile, Browser extension
Platforms Web, Windows, macOS, iOS, Android Web, Windows, macOS, iOS, Android, Chrome extension
Support Phone, Live chat, Docs Docs
Integrations 9 integrations 8 integrations
Built for Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Microsoft 365 Copilot Agent Store 0/1 · Grammarly 0/1
Team administration Not checked yet Not checked yet
Specs
AI capabilities Not checked yet Not checked yet
Business integrations Not checked yet Not checked yet
Training data control Not checked yet Not checked yet
Deployment Not checked yet Not checked yet
Our review
Pros
  • Discover and install ready-to-use agents from Microsoft and trusted partners
  • Admin approval, enablement, and lifecycle management support governance
  • Supports declarative, custom-engine, Copilot Studio, SharePoint, and connector agents
  • Checks grammar, spelling, punctuation, clarity, fluency, and tone
  • Works across web, desktop, mobile, and browser extension
  • Connects with Word, Google Docs, Gmail, Salesforce, and other business tools
Cons
  • Access is tied to Microsoft 365 Copilot plans, not a standalone Agent Store price
  • Agent use is centered on Microsoft 365 Copilot and supported Microsoft 365 apps
  • The listed plans do not establish agent counts or API access
  • Pro starts at $12 per user per month
  • The Free plan limits AI use to 100 prompts per month
  • Enterprise features such as data loss prevention are reserved for Enterprise
Our verdict

Microsoft 365 Copilot Agent Store is an in-product catalog for employees and IT administrators to discover, install, use, and manage AI agents in Microsoft 365 Copilot and related apps. It suits organizations already standardized on…

Read the review →

Grammarly is an AI writing assistant for people and teams who want help refining everyday business writing. It checks spelling, grammar, punctuation, clarity, fluency, and tone, and offers suggestions and rewrites for sentences and…

Read the review →
  1. Microsoft 365 Copilot Agent StoreBusiness Ai Tools 8.7Paid
  2. GrammarlyBusiness Ai Tools 8.5Free plan

Strengths and trade-offs

  • Microsoft 365 Copilot Agent Store — where it wins

    • Discover and install ready-to-use agents from Microsoft and trusted partners
    • Admin approval, enablement, and lifecycle management support governance
    • Supports declarative, custom-engine, Copilot Studio, SharePoint, and connector agents

    Where it doesn't

    • Access is tied to Microsoft 365 Copilot plans, not a standalone Agent Store price
    • Agent use is centered on Microsoft 365 Copilot and supported Microsoft 365 apps
    • The listed plans do not establish agent counts or API access

  • Grammarly — where it wins

    • Checks grammar, spelling, punctuation, clarity, fluency, and tone
    • Works across web, desktop, mobile, and browser extension
    • Connects with Word, Google Docs, Gmail, Salesforce, and other business tools

    Where it doesn't

    • Pro starts at $12 per user per month
    • The Free plan limits AI use to 100 prompts per month
    • Enterprise features such as data loss prevention are reserved for Enterprise
  • Microsoft 365 Copilot Agent Store8.7/10 · Paid

    A governed catalog for finding, installing, and managing agents across Microsoft 365.

    Visit MicrosoftFull verdict →
  • Grammarly8.5/10 · Free plan

    A broad writing assistant for teams that need consistent, polished business communication.

    Visit GrammarlyFull verdict →

More comparisons

All business ai tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026

Last updated · How we research and update