Grammarly vs QuillBot 2026 - Which AI Writing Tool Is Worth Paying For?
Grammarly and QuillBot both check grammar, rewrite text and flag AI-generated writing, but they started from opposite ends. Grammarly, now part of the Superhuman suite, is a real-time writing assistant that works across your apps, with Pro at $12/month billed annually or $30 month-to-month. QuillBot is a paraphrasing-first toolkit with Premium at $99.95/year (about $8.33/month) or $19.95 month-to-month.
Our verdict
Grammarly wins for everyday professional writing and polish everywhere you type. QuillBot wins for paraphrasing, summarizing and students on a budget.
When to choose each
Choose Grammarly when...
- Real-time suggestions across browsers, desktop apps, email and docs
- Tone, clarity and full-sentence rewrites for professional writing
- AI agents such as AI Grader, Citation Finder and Reader Reactions
- Team features: style guides, brand tones and analytics
- Enterprise security with SAML SSO, SCIM and BYOK encryption
- Plagiarism checker and AI-text detection on Pro
Choose Quillbot when...
- Dedicated paraphraser with 9 modes plus custom modes on Premium
- Cheaper Premium: $99.95/year or $19.95/month
- Summarizer, citation generator and translator in one suite
- AI detector and AI humanizer included in the toolkit
- Works on the web, Chrome, Microsoft Word and mobile
Not sure which fits your workflow?
Describe what you're trying to do and we'll build you a personalized AI tool stack - with step-by-step instructions.
Build My AI WorkflowFrequently asked questions
Is Grammarly or QuillBot better for students?
QuillBot is usually the better value for students: the annual Premium plan is cheaper and bundles a paraphraser, summarizer, citation generator and plagiarism checker. Grammarly is better if you mainly want clean grammar and clear writing in every app, and its AI Grader and Citation Finder agents are aimed at student work.
How much do Grammarly and QuillBot cost?
Grammarly has a free plan, Pro at $12/month billed annually ($30 if paid monthly) and custom Enterprise pricing. QuillBot has a free plan and Premium at $19.95/month or $99.95/year.
Is QuillBot free?
Yes, with limits. The free plan paraphrases up to 125 words at a time and only unlocks the Standard and Fluency modes. Premium removes the word limit and unlocks all modes plus the plagiarism checker.
Can Grammarly or QuillBot detect AI writing?
Both include AI detectors; Grammarly reserves its AI detection and plagiarism checking for Pro. Treat any AI detector as a signal rather than proof, because false positives on human writing are common across these tools.
Do I need both Grammarly and QuillBot?
Most people only need one. Pick Grammarly if your priority is polished emails, documents and messages across apps. Pick QuillBot if you frequently rewrite, summarize or translate source material.