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AI writing assistant providing real-time grammar, clarity, tone, and style suggestions across browsers, desktop apps, and productivity tools, used by 40 million people globally.
Grammarly's proprietary NLP models for grammar and basic tone detection; limited GrammarlyGO generative prompts.
Unlimited basic grammar and spelling; 100 monthly AI generative prompts; no plagiarism checker, advanced tone suggestions, or team features.
Content Creation
8.0Grammarly Pro's full-sentence rewrites, tone suggestions, and 2,000 monthly AI prompts help writers produce clearer, more polished content; strongest for editing and improving existing drafts rather than generating new content from scratch.
Personal Productivity
8.5Grammarly's browser extension and Microsoft Office/Google Docs integrations ensure writing quality is checked in every context a professional writes — email, documents, Slack, LinkedIn, and web forms — without switching tools.
Education
8.040 million users globally includes a large student base; Grammarly helps non-native English speakers produce professional-quality written communication; plagiarism checker is particularly relevant for academic writing.
Grammarly is an AI-powered writing assistant that checks grammar, spelling, clarity, tone, style, and plagiarism in real-time as users write across any platform. Its browser extension, desktop app, and Microsoft Office and Google Docs integrations make it the most broadly deployed writing tool in the category. In 2025, Grammarly rebranded its Premium plan as Pro, consolidating previously separate Business and Premium tiers into a single plan at $12/month (annual). Pro includes 2,000 monthly AI generative prompts, tone detection, full-sentence rewrites, style guides, brand tones, and team features for up to 149 members. The Enterprise plan covers 150+ member organisations with custom controls, audit logs, and dedicated support. Primary limitation: Grammarly Pro corrects and enhances existing writing; it is not a content generation tool and does not produce long-form drafts from prompts in the way ChatGPT or Jasper do.
Pricing
| Plan | Model | Usage Limits | Price |
|---|---|---|---|
| FreeFREE | Grammarly's proprietary NLP models for grammar and basic tone detection; limited GrammarlyGO generative prompts. | Unlimited basic grammar and spelling; 100 monthly AI generative prompts; no plagiarism checker, advanced tone suggestions, or team features. | Free |
| Pro | Full GrammarlyGO with 2,000 monthly prompts; advanced writing suggestions powered by Grammarly's AI and integrated LLM capabilities; plagiarism detection via proprietary database. | 2,000 monthly AI generative prompts; unlimited plagiarism checking; full-sentence rewrites; tone, clarity, and style suggestions; up to 149 team members; 2 user groups; brand tones; style guide access. | $12/mo annual or $30/mo monthly |
| Enterprise | Full Pro capabilities plus enterprise governance features; model access is not user-configurable. | Unlimited generative AI prompts; unlimited members; advanced user groups; custom roles and permissions; confidential mode; audit logs; SSO; dedicated account manager; VIP customer support. | custom |
Grammarly's proprietary NLP models for grammar and basic tone detection; limited GrammarlyGO generative prompts.
Unlimited basic grammar and spelling; 100 monthly AI generative prompts; no plagiarism checker, advanced tone suggestions, or team features.
Pro at $12/month (annual) provides unlimited plagiarism checking, full-sentence rewrites, and 2,000 AI prompts — all relevant for freelance writers producing content for multiple clients.
Free tier provides unlimited grammar checks sufficient for academic writing; plagiarism checker on Pro ($12/month) is directly relevant for students submitting original work; educational institution licenses available at negotiated pricing.
Enterprise plan's style guides, brand tones, user groups, and confidential mode enable consistent, brand-compliant communication across large writing teams; deployed by 50,000+ organisations globally including Fortune 500 companies.
Annual Pro at $144/year ($12/month) is one of the lowest-cost professional writing tools in the category; unlimited plagiarism checking and advanced tone controls support freelancers working across multiple client styles and industries.
Jasper
Marketing content generation (not editing); $39/month; requires existing content for style improvement rather than generating it.
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ProWritingAid
Deeper structural editing for long-form writers; manuscript-level style reports; $10/month annual vs Grammarly Pro's $12/month; no real-time browser extension.
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QuillBot
Lower-cost paraphrasing specialist at $8.33/month; no real-time correction or plagiarism checker on free tier; stronger for sentence-level rewriting than editing.
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Consider These Instead
Choose ProWritingAid ($10/month annual) if you are a long-form fiction writer or author who needs deep structural analysis of manuscript-length documents — ProWritingAid's style reports and writer-specific feedback go beyond Grammarly's sentence-level corrections. Choose ChatGPT Plus ($20/month) if generating new content from prompts is as important as editing existing text — ChatGPT produces long-form drafts while Grammarly corrects them, and many users run both tools in parallel.