QuillBot is an AI writing suite built around a paraphraser, with a grammar checker, AI detector, humanizer, plagiarism checker, summarizer, translator and AI chat. The free plan rewrites short passages of around 100 to 125 words in two modes and summarizes up to 1,200 words. Premium costs $99.95 a year, about $8.33 a month, or $19.95 month to month, and removes the paraphrasing cap, adds nine modes plus custom ones, 25,000 words of plagiarism checks a month, full AI detection and humanizing and 6,000-word summaries.
Reviewed by EdGrows·Updated Sep 28, 2026This analysis is based on documentation, public user reports, and vendor materials — not yet on our own hands-on testing. How we rate
QuillBot made its name with one tool: paste a sentence, pick a mode, and get the same meaning in different words. That Paraphraser is still the center of the product, now joined by a grammar checker, an AI detector, an AI humanizer, a plagiarism checker, a summarizer, a citation generator, a translator, an AI image generator and an AI chat assistant. QuillBot says more than 35 million writers use it, a large share of them students.
The homepage reflects the shift. It opens with a single prompt box, create something great today, and buttons for the Paraphraser, the Humanizer and the AI Detector, with the rest of the tools in a sidebar. The browser extensions and the Word add-in bring the same tools into Google Docs, Gmail and Microsoft Word.
Free QuillBot is usable, but every tool has a ceiling, and those ceilings decide whether you need Premium.
| Tool | Free | Premium |
|---|---|---|
| Paraphraser | Short passages (shown as 100 or 125 words), 2 modes | No cap, 9 modes plus unlimited custom modes |
| Paraphraser extras | 23 languages, synonym slider | Mode comparison and history |
| Summarizer | 1,200 words | 6,000 words, custom summaries |
| AI Humanizer | Short passages, limited use, no history | Full access with history and insights |
| AI Detector | Limited | Full access |
| Plagiarism checker | Not included | 25,000 words a month |
| AI chat | Limited use | Higher use |
| QuillBot Flow storage | 10 MB | 100 MB |
The paraphrasing cap is the one most people hit first. A single paragraph of a school essay or a product description usually runs past it, so free users end up working a few sentences at a time.
QuillBot's plan comparison as shown to us in euros on September 28, 2026. US prices are listed below.
QuillBot's own FAQ lists Premium at $99.95 billed yearly, which averages $8.33 a month, and $19.95 billed monthly; the pricing page advertises the annual plan as 58% off the monthly rate. For a student who writes all year, the annual plan costs about the same as five months of monthly billing.
What the money buys, beyond the missing caps, is mostly quality of rewriting: nine built-in modes, from Academic to Simple, custom modes that imitate a voice you describe, side-by-side mode comparison, advanced grammar suggestions with tone insights, and the plagiarism checker, which scans 25,000 words a month for missed citations in over 100 languages. The Team plan adds usage metrics, user management, central billing and data controls for schools and companies.
QuillBot now sells both sides of the AI-writing question: a detector that estimates whether text was written by AI, and a humanizer that rewrites AI text to sound more natural. Both have legitimate uses. A non-native speaker can humanize a stiff draft they wrote with help, and an editor can screen submissions with the detector.
The same pairing invites misuse. Many schools and publishers treat submitting AI-generated or heavily paraphrased work without disclosure as a breach of their rules, whether or not a detector notices. And detectors, QuillBot's included, produce false positives and false negatives, so a score should start a conversation rather than settle one. Used as a writing aid, QuillBot is excellent; used to hide authorship, it is a risk to the person using it.
Grammarly is the stronger final proofreader and works in more apps, at $144 a year for Pro against QuillBot's $99.95. Wordtune offers sentence-level rewrites in different tones with a smaller free allowance. For checking whether text came from AI, GPTZero and Originality.ai are the specialists, and for translation, DeepL leads on quality.
A short passage at a time. QuillBot's pages have shown the free Paraphraser cap as 100 words and, on other visits, 125 words, with two modes, Standard and Fluency. Free users can still paraphrase in 23 languages, translate into 40+ and adjust how many synonyms are swapped. Premium removes the cap.
QuillBot lists three ways to pay: $99.95 a year, which averages $8.33 a month, a shorter multi-month plan, and $19.95 month to month. The yearly plan works out 58% cheaper than paying monthly. Prices can appear in local currency; the pricing page showed €8.33 a month on annual billing to European visitors.
25,000 words a month, on Premium and the Team plan, with detection of missed citations in more than 100 languages. The free plan does not include the plagiarism checker. For a student, 25,000 words is roughly ten long essays a month.
It is a useful signal, not proof. Like every AI detector, it can flag human writing and miss edited AI text, so teachers and editors should treat a score as a reason to look closer. Free users get limited access; Premium includes the full detector.
A tool that rewrites AI-generated text to sound more natural. Free users can humanize short passages with limited usage and no history; Premium gives full access with history and insights. Using it to disguise AI-written coursework can break school rules even when detectors are fooled.
Yes. QuillBot has extensions for Chrome, Edge and Safari that work in Google Docs, Gmail and other sites, an add-in for Microsoft Word, desktop apps and mobile apps. Limits can vary across platforms, according to QuillBot.
Everything in Premium for each member, plus team usage metrics, a user management dashboard, centralized billing, data controls and priority support with account management. QuillBot prices it separately on its Team plan page.
They cover different steps. QuillBot is the stronger rewriter and summarizer and costs less. Grammarly is the better final checker, with broader suggestions that work in more apps. Many students paraphrase and summarize in QuillBot and run the final draft through Grammarly.
A data and outreach workbench for growth teams, priced on two meters: actions for platform work and data credits for the data you buy. Launch starts at $185.
The best backlink data in the industry, sold with a credit meter and single-seat plans that make the real cost hard to read.
The best fiction-tuned AI available, wrapped in a credit system that's genuinely hard to predict. Worth it if prose generation is your actual bottleneck.