Grammarly

Editorial verdict

Grammarly is a writing-assistance layer that works across browsers, desktop apps, mobile devices, Google Docs, Microsoft Office, and its own editor. Its enduring strength is proximity: grammar, clarity, tone, rewriting, and generative assistance appear where people already compose email, documents, support replies, and web content.

The Free plan is a useful default for basic correctness and tone awareness. Pro is most valuable for people who write enough to benefit from full-sentence rewrites, tone adjustment, fluency help, plagiarism checks, AI-text detection, and a larger generative allowance. Team value comes from shared style, brand tone, knowledge, snippets, administration, and analytics—not simply buying individual licenses in bulk.

Best for

• Professionals writing frequent email, documents, reports, and customer communication.
• Writers who want immediate clarity and tone feedback inside existing applications.
• Multilingual professionals improving fluency in English.
• Teams standardizing terminology, tone, reusable text, and editorial rules.
• Organizations that need account roles, feature controls, groups, and usage analytics.

What Grammarly does well

Works in the flow of writing

Grammarly’s browser, desktop, Office, Google Docs, and mobile surfaces reduce the need to copy text into a separate assistant. That makes it more likely that routine corrections and style guidance are actually used.

Improves more than spelling

Free covers mistakes and tone visibility. Pro adds full-sentence rewriting, tone adjustment, English fluency, inclusive-language guidance, citation consistency, plagiarism checking, AI-text detection, and generative assistance.

Supports organizational consistency

Pro for teams adds centralized billing, shared style guidance, custom tones, Knowledge Share, snippets, team analytics, user groups, permissions, and a feature-management hub. These controls are the reason to evaluate the team offer separately from individual Pro.

Provides a broad application footprint

Support across common writing environments is a practical advantage over assistants that live only in a chat window. Users can receive feedback while composing rather than after the communication is already finished.

Current plans and allowances

Grammarly Free: basic correctness, tone detection, and 100 generative AI prompts per month.

Grammarly Pro — US$12 per member per month when billed annually, or US$30 when billed monthly: advanced rewriting and tone controls, fluency assistance, inclusive language, citation consistency, plagiarism and AI-text detection, priority support, and 2,000 AI prompts.

Pro for teams: the Pro writing features plus centralized billing, one shared style guide, one brand tone, Knowledge Share, snippets, analytics, user groups, account roles, permissions, and feature controls. The live page presented the same headline Pro price but buyers should verify team minimums, billing, and regional terms at checkout.

Enterprise: contact sales for organization-specific security, governance, support, and deployment requirements.

Where Grammarly falls short

• Suggestions can flatten a distinctive voice or remove intentional rhythm and terminology.
• Correct grammar does not guarantee correct facts, sound logic, persuasive structure, or appropriate legal language.
• AI detection is probabilistic and should never be used as sole evidence of misconduct.
• Plagiarism checks help identify overlap but do not replace source review and citation judgment.
• The monthly Pro price is high compared with annual billing and many general AI subscriptions.
• Because Grammarly operates inside many applications, organizations must evaluate data handling for sensitive text.
• Team style assets need an owner; outdated rules can distribute mistakes consistently.

A practical evaluation test

1. Collect a representative set of emails, reports, articles, support responses, and regulated or sensitive examples.
2. Have users edit copies with Free and Pro while recording accepted, rejected, and harmful suggestions.
3. Measure time saved, error reduction, readability, brand consistency, and the amount of final human editing.
4. Test whether tone and fluency changes preserve meaning for multilingual writers.
5. For teams, build a small style guide, brand tone, knowledge entries, and snippets, then ask new users to complete the same tasks.
6. Validate application coverage, permission controls, offboarding, analytics, and feature restrictions with non-sensitive test accounts.
7. Compare annual cost with the actual weekly hours saved, not the number of suggestions displayed.

Responsible AI and privacy checks

Do not paste secrets, credentials, unpublished financial information, protected health data, legal strategy, customer records, or other restricted material unless organizational policy and the contract explicitly allow it. Human reviewers should verify facts, citations, quotations, names, numbers, and high-impact decisions. AI-detection results should be treated as one uncertain signal, never an accusation.

Alternatives

LanguageTool provides multilingual grammar and style support. ProWritingAid offers deeper long-form writing reports. Microsoft Editor fits Microsoft-centric workflows. Wordtune emphasizes rewriting, while ChatGPT, Claude, and Gemini can provide broader drafting and reasoning when users are willing to work in a separate assistant.

Final recommendation

Keep Grammarly Free if basic correctness and tone signals solve the problem. Upgrade an individual only after advanced rewrites, plagiarism checking, fluency help, and the AI allowance demonstrate measurable value. Choose the team plan when shared writing standards and governance—not merely more prompts—justify centralized deployment.

Research note: Prices, prompt allowances, and plan features were checked against Grammarly’s official plans page while signed in. Pricing and eligibility can vary; verify the live checkout and organization terms.