Grammarly vs QuillBot: Which AI Writing Tool Is Better in 2026?
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We evaluated Grammarly and QuillBot across pricing, paraphrasing depth, integration breadth, and AI detection capabilities to determine the superior tool for 2026. This comparison is designed for professionals and students who need to decide between an always-on grammar coach and a dedicated text rewriter.
How we ranked these
Head to head
Grammarly
Our pickBest for: Professionals and students needing an always-on grammar and tone coach for original writing, emails, and documents
- Real-time correction across 500,000+ apps and websites via browser extensions and native apps
- Tone detection labels writing as formal, friendly, or confident to adjust before sending
- GrammarlyGO generates drafts and rewrites with controls for tone, formality, and length
- Plagiarism detection checks text against 16 billion web pages and academic databases
- Premium costs $30/month if billed monthly, significantly higher than QuillBot's monthly rate
- Paraphrasing is limited to suggestions rather than deep structural rewrites found in dedicated tools
- Does not improve logic or structure, focusing only on style and grammar
QuillBot
Best for: Students, researchers, and ESL writers who frequently rework existing text through paraphrasing, summarizing, and rewriting
- Offers 8–9+ paraphrasing modes including Standard, Fluency, Formal, Academic, and Creative
- Humanizer feature rewrites text to pass AI detection using Advanced mode in Premium
- Summarizer condenses long documents into key points for quick review
- AI Detector checks if content reads as AI-generated with unlimited usage on the free tier
- Free tier restricts the Paraphraser to a 125-word limit and only Standard/Fluency modes
- Limited integrations compared to Grammarly, primarily supporting Google Docs and browser extensions
- Lacks native desktop apps for macOS and Windows, relying on web and browser extension interfaces
How to choose
Choose QuillBot if you need 8–9+ distinct paraphrase modes like Academic or Creative; Grammarly offers only basic rewrite suggestions.
Select Grammarly if you write across 500,000+ apps including Slack, MS Word, and CMS platforms; QuillBot is limited to browser extensions and Google Docs.
QuillBot Premium is cheaper at $10/mo (annual) vs Grammarly Premium at $12/mo (annual); however, Grammarly's free tier offers unlimited word count for basic grammar checks.
Pick QuillBot for its dedicated Humanizer and AI Detector tools; Grammarly focuses on originality via plagiarism checks against 16 billion pages.
Our verdict
Grammarly is the better choice for professionals needing comprehensive real-time editing and broad app integration, while QuillBot wins for students and researchers who prioritize deep paraphrasing and AI detection tools at a lower price point.
Frequently asked questions
Which tool has a better free plan?
Grammarly's free plan includes unlimited word count for grammar and tone checks, whereas QuillBot's free Paraphraser is capped at 125 words per use.
Does Grammarly have a plagiarism checker?
Yes, Grammarly Premium and Business plans check text against 16 billion web pages and academic databases.
Which tool is better for paraphrasing?
QuillBot is superior for paraphrasing, offering 8–9+ modes like Formal, Academic, and Creative, while Grammarly provides only basic rewrite suggestions.
What is the monthly cost of Grammarly Premium?
Grammarly Premium costs $30/month if billed monthly, or $12/month if billed annually ($144/year).
