Grammarly
AI writing assistant that checks grammar, tone, and clarity and generates text across apps and browsers
FREEMIUM Verified JUN 22, 2026
QuillBot
AI writing suite built around paraphrasing, with grammar checking, summarizing, and AI detection
QuillBot is an AI writing suite built around paraphrasing, with grammar checking, summarizing, AI detection, translation, and AI chat layered on top. The free tier paraphrases up to 125 words at a time in 2 modes; Premium runs $19.95/month, or about $8.33/month on the annual plan ($99.95/year), and unlocks unlimited paraphrasing, more rewriting modes, and a plagiarism checker. Best for students and writers who rewrite and polish text often.
Verified JUN 22, 2026 FREEMIUM Live
What is QuillBot?
QuillBot is an AI writing assistant best known for its paraphraser — a tool that rewrites sentences and paragraphs to change wording, improve flow, or adjust tone. Around that core it has grown into a small suite: a grammar checker, a summarizer, an AI text detector, a translator, a citation generator, and an AI chat assistant. The free tier paraphrases up to 125 words at a time in two modes (Standard and Fluency), which is enough to try the product but limiting for longer work.
Premium, at $19.95/month or about $8.33/month on an annual plan, removes the word cap and unlocks every paraphrasing mode — Natural, Simple, Academic, Creative, and more — along with an adjustable synonym slider, custom-length summaries up to roughly 6,000 words, an unlimited AI Humanizer and AI Detector, and a plagiarism checker that covers up to 25,000 words a month. QuillBot runs in the browser, as desktop and mobile apps, and as extensions for Chrome, Edge, and Microsoft Word, so it is available wherever you write. It does not, however, offer an official API.
Who is it for?
QuillBot is aimed at people who frequently rewrite, condense, or polish text and want those tools bundled in one affordable product. The free tier suits occasional paraphrasing; Premium makes sense once the 125-word cap and the lack of plagiarism checking start getting in the way.
- Students and researchers who paraphrase sources, summarize papers, and need a plagiarism check before submitting.
- Non-native English writers who use paraphrasing and grammar tools to make their writing read more naturally.
- Bloggers and content writers who rework drafts, repurpose material, and want summaries and citations in one place.
- Casual writers who want a free, capable paraphraser and grammar checker without committing to a subscription.
How much does QuillBot cost?
Starting price: $0 · Free tier: yes · Model: freemium
Pricing verified JUN 22, 2026
Price history tracked from June 2026
| Plan | Price | Includes |
|---|---|---|
| Free | Free | Paraphrase up to 125 words at a time · 2 paraphrasing modes (Standard, Fluency) · Basic grammar checker and summarizer · Limited AI Detector, AI Chat, and humanizer |
| Premium | $19.95/mo | About $8.33/month billed annually ($99.95/year) · Unlimited paraphrasing across all modes · Custom-length summaries up to ~6,000 words · Plagiarism checker up to 25,000 words/month · Unlimited AI Humanizer, AI Detector, and AI Chat |
What are QuillBot's key features?
- Paraphraser with multiple rewriting modes and an adjustable synonym slider
- Grammar and spelling checker
- Summarizer with key-sentence and paragraph modes
- AI Humanizer that rewrites AI-sounding text
- AI Detector for text plus an AI image detector
- Plagiarism checker (Premium, word-capped)
- Translator and an AI Chat assistant
- Citation generator for APA, MLA, and Chicago styles
What people use QuillBot for
- 01 Rephrasing sentences and paragraphs to improve flow or avoid repetition
- 02 Fixing grammar and spelling across documents and emails
- 03 Summarizing long articles or papers into key points
- 04 Checking a draft for plagiarism before submitting (Premium)
- 05 Rewriting AI-generated text to sound more natural with the Humanizer
Pros and cons
| Pros | Cons |
|---|---|
| Generous, genuinely usable free tier for casual paraphrasing and grammar fixes | No official developer API, so it cannot be used in programmatic or automation workflows |
| Premium is cheap on annual billing (about $8.33/month) versus most writing suites | The free tier's 125-word paraphrase cap is restrictive for real documents |
| Broad bundle — paraphrase, grammar, humanizer, detector, summarizer, translator — in one product | The monthly price ($19.95) is steep relative to annual — the low price only applies if you commit for a year |
| Output quality and AI-detector reliability vary, and the humanizer is a cat-and-mouse feature |
What are the best QuillBot alternatives?
Jasper
AI marketing platform with 100+ specialized agents for brand-consistent content at scale
PAID Verified JUN 11, 2026
Writesonic
AI writing and GEO platform that tracks brand visibility across ChatGPT, Gemini and 8 other AI engines
PAID Verified JUN 11, 2026
Sudowrite
AI writing platform built specifically for novelists and fiction writers, with a Story Bible workflow and a proprietary Muse model
PAID Verified JUN 20, 2026
Copy.ai
AI-native GTM platform for automating sales, marketing, and content workflows
PAID Verified JUN 11, 2026
Frequently asked questions
Is QuillBot free?
Yes. The free tier lets you paraphrase up to 125 words at a time in two modes, with a basic grammar checker and summarizer plus limited use of the AI Detector, AI Chat, and humanizer. Premium removes the word cap and unlocks all modes and the plagiarism checker.
How much does QuillBot Premium cost?
QuillBot Premium is $19.95/month month-to-month, or about $8.33/month when billed annually ($99.95/year). Premium unlocks unlimited paraphrasing, all rewriting modes, longer summaries, and a plagiarism checker up to 25,000 words per month.
Does QuillBot have an API?
No. QuillBot does not publish an official public developer API. Third-party and unofficial wrappers exist, but they are not supported by QuillBot, so it is not a reliable choice for programmatic or automated text processing.
Is QuillBot's paraphraser good enough to avoid plagiarism?
QuillBot rewrites wording, but paraphrasing alone does not make borrowed ideas original — you still need to cite sources. Premium includes a plagiarism checker (up to 25,000 words/month) to verify your text against existing content before you submit it.
What modes does the QuillBot paraphraser have?
The free tier includes Standard and Fluency modes. Premium adds more modes such as Natural, Simple, Academic, and Creative, plus an adjustable synonym slider to control how heavily the text is rewritten.
Can QuillBot detect AI-written text?
Yes. QuillBot includes an AI Detector for text and a separate AI image detector. As with all detectors, results are probabilistic and should be treated as guidance rather than proof.