Q
Writing
AI paraphrasing tool, grammar checker, and writing assistant
AI Writing ToolParaphrasingGrammar Checker
QuillBot is an all-in-one AI writing assistant built around its Paraphraser, with a Synonym Slider and 10+ tone/style modes to reword text without changing its meaning. It also bundles a Grammar Checker, Plagiarism Checker, AI Detector, AI Humanizer, Summarizer, Citation Generator, and Chrome/Word/browser integrations so you can write and refine text almost anywhere.
- Best for
- Students, content writers, and professionals who need to reword, polish, and check their own writing (grammar, tone, plagiarism, AI-detection risk) across the apps and sites they already use.
- Pricing
- Free plan with limited paraphrasing/humanizing and basic grammar/AI-detection. Premium is $4.17/mo (billed annually) for unlimited access; a custom-priced Team plan is available for organizations.
Core features
- • AI Paraphraser with Synonym Slider and 10+ modes (Standard, Fluency, Formal, Academic, Creative, Custom, and more)
- • Grammar Checker for spelling, grammar, and punctuation
- • AI Detector to check whether text reads as AI-generated
- • Plagiarism Checker
- • AI Humanizer to make AI-generated text sound more natural
- • Summarizer and Citation Generator
- • AI Chat and AI Image Generator
- • Chrome/Edge/Safari extensions, Word add-in, macOS/Windows apps
Use cases
- 1. Rephrasing sentences or paragraphs while keeping the original meaning
- 2. Checking and fixing grammar before submitting an assignment or article
- 3. Making AI-generated drafts sound more natural before publishing
- 4. Checking existing text for plagiarism or AI-detection risk
- 5. Summarizing long articles or generating citations for research
How to use
Paste or upload the text you want to work with, pick a tool (Paraphraser, Grammar Checker, Summarizer, etc.), and for the Paraphraser choose a mode and adjust the Synonym Slider. Review the AI's output, click individual words for alternate synonyms if needed, then copy or export the result.
Pricing plans
Free
$0/mo
- • Paraphrase up to 125 words, 2 modes
- • Fix basic grammar errors
- • Humanize up to 125 words (limited)
- • Generate basic summaries
- • Access AI Detector (limited)
Premium
$4.17/mo (billed annually)
- • Full access to paraphrasing, unlimited modes
- • Advanced grammar recommendations
- • Full access to AI Humanizer
- • Custom summaries
- • Full access to AI Detector
- • Plagiarism checking
Team Plan
Custom pricing
- • Everything in Premium
- • Team usage metrics
- • User management dashboard
- • Centralized billing
- • Priority assistance & account management support
FAQ
Is QuillBot free?
Yes — the free plan covers basic paraphrasing (up to 125 words, 2 modes), basic grammar fixes, and limited AI Detector/Humanizer access; Premium ($4.17/mo billed annually) removes those limits.
Does QuillBot change the meaning of my text?
No — the Paraphraser is designed to reword sentences without changing their original meaning; the Synonym Slider controls how much of the wording changes.
Can QuillBot detect AI-generated text?
Yes, via its AI Detector tool, available in a limited form on the free plan and in full on Premium.
Where it holds up
- Synonym Slider gives fine control over how much of the text gets reworded
- Bundles paraphrasing, grammar, plagiarism, AI detection, and summarizing in one account
- Available almost everywhere via Chrome/Edge/Safari extensions, Word add-in, and desktop apps
- Supports rephrasing in 20+ languages
- Usable free tier to try the core paraphrasing and grammar features
Where it falls short
- Free plan caps paraphrasing/humanizing at 125 words per request
- Most advanced modes (Formal, Creative, Academic, Custom, Humanize) require Premium
- AI Detector accuracy, like all AI detectors, isn't guaranteed to be 100% correct
