Grammarly and ProWritingAid both check grammar, spelling and style, but they're built with different writers in mind. Grammarly focuses on fast, inline corrections and AI help wherever you write; ProWritingAid adds in-depth writing reports and many tools aimed at long-form and fiction writers. Here's how they compare for students on features, free plans and price.
| Feature | Grammarly | ProWritingAid |
|---|---|---|
| Best for | Fast inline corrections and documenting your writing process | Detailed style reports on long documents |
| Free plan | Grammar and spelling, tone detection, 100 AI prompts/month, Authorship, citation generator | Grammar, spelling and punctuation on 500 words at a time; 2 report runs, 10 Rephrases and 3 Sparks per day |
| Paid price | Pro $12/month billed annually ($144/year), or $30/month billed monthly | Premium $10/month billed yearly ($120), $30/month monthly, or $399 lifetime |
| Student deal | 50% off Pro for students for a limited time via SheerID (schools can buy Grammarly for Education) | 25% off yearly plans via Student Beans |
| Style and readability | Tone detection; rewrites and tone adjustment on Pro | 25+ writing reports and a custom style guide on Premium |
| Rewriting | Full-sentence rewrites on Pro; 100 AI prompts/month free | Rephrase (10/day free, unlimited on Premium) |
| Plagiarism checking | Included in Pro | Extra cost on all plans |
| Citations | Free APA, MLA and Chicago generator | Not a core feature |
| Writing-process proof | Free Authorship reports | No equivalent |
| Integrations | Browser extensions, Word, Google Docs, Windows and Mac apps, mobile | Google Docs, Microsoft Office, web and desktop editors, desktop integration |
Prices and features as of November 2026 — check the official site for current details
Prices and features as of November 2026 — check the official site for current details
Best for: fast inline corrections and showing how you wrote your paper
Grammarly is an AI writing assistant (now part of the company Superhuman) that checks grammar, spelling and tone as you type in Google Docs, Word, your browser and its desktop and mobile apps. The free plan includes grammar and spelling corrections, tone detection, 100 generative AI prompts a month, a citation generator for APA, MLA and Chicago, and Authorship, which records what you typed, pasted or generated with AI so you can share a report of your writing process. Pro adds full-sentence rewrites, tone adjustment, 2,000 AI prompts a month and a plagiarism checker; it costs $12/month billed annually ($144/year) or $30/month billed monthly.
Why students use it:
Best for: detailed style reports on long papers and theses
ProWritingAid is a grammar checker and writing coach with 25+ writing analysis reports covering style and readability, plus Rephrase suggestions and a custom style guide. It works in Google Docs, Microsoft Office, its web and desktop editors, and across other apps with its desktop integration. The free plan includes grammar, spelling and punctuation checks on up to 500 words at a time, 2 report runs per day, 10 Rephrases and 3 Sparks per day. Premium removes the word limit and adds unlimited reports and Rephrases for $10/month billed yearly ($120), $30/month billed monthly, or $399 one-time for lifetime access. Premium Pro costs $12/month billed yearly ($144), $36/month monthly, or $699 lifetime. Plagiarism checks cost extra on every plan. Verified university and college students get 25% off yearly plans through Student Beans.
Why students use it:
Choose Grammarly if you want quick corrections as you type, a built-in plagiarism checker on Pro and free Authorship reports to show your instructor how you wrote. Choose ProWritingAid if you write long papers or a thesis and want detailed style and readability reports — its yearly Premium plan with the student discount is cheaper than Grammarly Pro. Either way, check your instructor's AI policy before using AI rewrites on graded work.
Fixing grammar and spelling in your own writing is usually allowed, but having AI rewrite large parts of an assignment may not be. Turnitin's AI writing report can flag text that appears AI-generated or AI-paraphrased, though Turnitin says results shouldn't be the only basis for action. Rules vary by course, so read your syllabus and disclose AI use when required.