For most students, these tools solve different problems — and that's the whole point. Grammarly is the better choice if your main need is catching grammar errors, improving sentence clarity, and getting style feedback on your own writing. QuillBot wins if you regularly need to paraphrase sources, summarize research, or reword content to avoid accidental plagiarism.
Choose Grammarly if you want an editor that improves what you write. Choose QuillBot if you need help working with sources and restructuring existing text. Many students end up using both — QuillBot while researching and drafting, Grammarly before submitting.
| Category | Grammarly | QuillBot |
|---|---|---|
| Grammar & spelling | Excellent | Basic (not the focus) |
| Paraphrasing quality | Limited / add-on | Excellent |
| Summarization | Not available | Good |
| Tone & style suggestions | Strong | Basic |
| Plagiarism detection | Yes (Premium) | Yes (Premium) |
| AI writing detection | Yes (paid) | Yes (paid) |
| Free tier usefulness | Moderate | Strong |
| Citation tools | None | Basic citation integration |
| Plan | Grammarly | QuillBot |
|---|---|---|
| Free tier | Yes — grammar, spelling, basic tone | Yes — 125 words/paraphrase, summarizer, grammar checker |
| Premium / Plus | ~$12/mo (annual) or ~$30/mo monthly | ~$9.99/mo (annual ~$4.17/mo) |
| Student discount | Yes — varies by institution / promo | Yes — occasional discounts, check site |
| Team / Education plan | Grammarly for Education (institution pricing) | QuillBot for Teams (contact for pricing) |
| Plagiarism checker | Included in Premium | Included in Premium |
Pricing and features verified as of June 2026. Verify current pricing at grammarly.com/plans and quillbot.com/pricing before purchasing.
Grammarly started as a grammar checker and has grown into a full writing assistant. Its core strength is real-time feedback on your own writing — catching errors, improving word choice, flagging passive voice overuse, adjusting tone, and now offering sentence rewrites through its generative AI features. For students, it works directly in Google Docs, Word, and the browser, which means it catches errors in the places you already write.
The free tier covers spelling, grammar, and punctuation — genuinely useful for catching typos and basic mistakes. Premium adds advanced suggestions, tone detection, full-sentence rewrites, and the plagiarism checker, which scans against a large web index.
Grammarly pricing: free tier available; Premium ~$12/mo billed annually. Verify current pricing at grammarly.com.
QuillBot is built around paraphrasing, and that focus shows. Its paraphraser gives you multiple rewrite modes — Standard, Fluency, Formal, Creative, Shorten, Expand — and you can switch between them to get the phrasing that fits your context. For students working with academic sources, this is genuinely useful: you can paste a dense passage from a journal article and get a cleaner version that you can understand, cite, and build on.
The free tier is more useful than Grammarly's free offering for this specific use case — you get 125 words per paraphrase, the summarizer, and a functional grammar checker. Premium removes word limits, adds more paraphrase modes, and unlocks better plagiarism checking. QuillBot Premium is also cheaper than Grammarly Premium, which matters for students on tight budgets.
QuillBot pricing: free tier available; Premium ~$9.99/mo monthly or ~$4.17/mo billed annually. Verify current pricing at quillbot.com.
If you can only afford one: QuillBot Premium at ~$4.17/mo (annual) is better value for most undergraduate students. It covers paraphrasing, summarizing, basic grammar checking, and plagiarism detection at a price that's half of Grammarly Premium. You give up real-time inline editing and stronger style coaching, but you gain the research workflow tools that matter most during the drafting phase.
If budget isn't the deciding factor: Grammarly Premium is worth it for students who write heavily — especially those in writing-intensive majors (English, Law, Journalism, History) where the quality of sentence-level writing is graded directly. Grammarly's feedback will actively improve your writing over time in a way QuillBot's paraphraser won't.
Best combination: Use QuillBot's free tier while researching and drafting to handle paraphrasing and summarization. Use Grammarly (free or paid) for the final editing pass before submission. This covers 90% of student writing needs without paying for both premium plans simultaneously.
Both tools have real limitations students hit. Know them before paying.
Many students upgrade both tools to Premium before figuring out which one they actually use. Start with QuillBot's free tier and Grammarly's free tier for a few weeks. You'll quickly see which one you open more. Pay for only that one first — you can always add the second later if a specific use case demands it.
QuillBot is for working with external sources, not for replacing your own writing. Running your own paragraphs through the paraphraser can introduce awkward phrasing, change meaning, and — if used on work that incorporates cited sources — muddy the attribution. Use it on source material you're trying to understand and integrate, not on your own prose.
Grammarly sometimes flags correct, intentional stylistic choices as errors — particularly sentence fragments used for emphasis, dash usage in academic writing, and discipline-specific terminology. It's a suggestion engine, not a style guide. If you're unsure whether to accept a suggestion, check against your university's preferred style guide (APA, MLA, Chicago) rather than defaulting to whatever Grammarly recommends.
For most students, the practical answer is: start with QuillBot's free tier (it's genuinely useful without paying anything) and use Grammarly's free tier for pre-submission editing. If you need to pay for one, QuillBot Premium is the better value for undergraduate research-heavy workflows. If you write at a level where sentence quality is graded critically, Grammarly Premium earns its higher price.
Neither tool replaces the skill of writing clearly and citing correctly. They're utilities, not substitutes. Students who use them as accelerators for tasks like paraphrasing and proofreading — while still doing the thinking themselves — get the most benefit without the academic integrity risk.
If you're also evaluating general-purpose AI writing tools beyond these two, the ChatGPT vs Claude comparison covers tools better suited to structural feedback and longer-form writing assistance. For a broader look at how AI models compare for writing tasks, the Claude vs Gemini comparison is also worth reading before you commit to a workflow.
This comparison was built using publicly available information about each tool's feature sets, pricing pages, and documentation as of June 2026. We do not claim to have run controlled benchmarks or formal side-by-side tests. Assessments are based on published capabilities, common reported use patterns among students, and analysis of where each tool's core design priorities lie. Feature availability and pricing change — verify both at the official tool sites before purchasing.
Pricing and features verified as of June 2026. Verify current pricing at official sites before purchasing: grammarly.com and quillbot.com.