QuillBot

What Is QuillBot?

QuillBot is a tool focused on English writing assistance, founded in 2017 and acquired by Course Hero in 2021. Its product suite includes:

• Paraphraser: The core feature for rewriting text
• Grammar Checker
• Plagiarism Checker
• Summarizer
• Citation Generator
• AI Detector
• Translator

This suite of tools essentially covers the auxiliary needs of academic writing, which is why QuillBot is particularly popular among college students.

Core Feature: Paraphraser

This is QuillBot’s most valuable feature and the reason for its fame. You paste in a piece of English text, and it generates multiple rewritten versions. You can control the direction of the rewrite by adjusting the "mode":

Standard: Moderate rewriting that preserves the original meaning Fluency: Prioritizes making the text more fluent and natural Formal: Adjusts to a more formal business/academic tone Simple: Re-expresses using simpler vocabulary, suitable for specific audiences Creative: More bold rewriting, potentially adding creative expression Expand: Adds details while rewriting to make the article richer Shorten: Compresses content while rewriting, retaining the core meaning

These modes give you some control over the direction of the rewrite, rather than producing a completely random rephrasing.

Synonym Replacement: Hovering your mouse over a word in the generated text displays replaceable synonyms, allowing you to manually select more appropriate wording. This is a good way to fine-tune the output.

Comparing Original and Rewritten Text: The interface displays the original and rewritten versions in split panes, making differences clear at a glance.

Grammar Checker

Compared to Grammarly, QuillBot’s grammar checker is an ancillary feature, not its main selling point. However, its accuracy in identifying basic grammatical errors (grammar, spelling, punctuation) is decent, and it is available on the free plan. If you are already paying for Grammarly, this feature offers no additional value to you; if you only need occasional grammar checks, QuillBot’s free version is sufficient.

Summarizer

Upload or paste a long article, and QuillBot generates a summary. It supports two modes:

• Key Sentences: Selects the most important sentences from the original text
• Paragraph: Writes a summary in AI-generated language

The Key Sentences mode is safer because it extracts directly from the source, avoiding hallucinations; the Paragraph mode produces smoother summaries but may have slight information deviations.

Citation Generator

Input a DOI, URL, or book title to automatically generate academic citations in formats such as APA, MLA, Chicago, and Harvard. For students writing papers, this feature saves the time required for manual citation formatting. While not as high-quality as professional reference management tools like Zotero, it is sufficient for scenarios where you need to generate one or two citations on the fly.

Who Uses QuillBot?

College Students (Largest User Group): Rewriting references, optimizing paper language, and checking grammar—these academic writing scenarios perfectly match QuillBot’s features. The free version meets basic needs without requiring a paid subscription.

Content Creators: Rewriting old content into new versions to publish the same core message with different expressions across various platforms, or repurposing existing materials as raw content for articles.

Non-Native English Speakers: Using QuillBot to rewrite their own English drafts into more fluent expressions, serving as a reference for grammar and phrasing.

SEO Content Workers: Rewriting existing content to produce different versions, which is a common requirement in the SEO field (though this practice itself is controversial).

Free vs. Premium

• Free Version: 125 characters per rewrite (sufficient for most paragraphs), limited mode selection, limited synonym replacement
• Premium ($19.95/month or $99.95/year): Unlimited character rewrites, all modes, plagiarism detection, and more advanced features

For occasional use, the free version is completely adequate. If you use it daily, the annual plan offers good value for money.

Comparison with Competitors

vs Grammarly: Grammarly focuses on grammar correction and writing quality improvement, with paraphrasing as an ancillary feature; QuillBot focuses on paraphrasing and rewriting, with grammar checking as an ancillary feature. The two are complementary, and many professional writers use both simultaneously.

vs ChatGPT: ChatGPT has stronger and more flexible rewriting capabilities, understanding complex instructions and handling various writing styles. However, ChatGPT is not designed with a user interface specifically for "rewriting," lacking the convenient mode selection and comparison views of QuillBot. If your primary need is rewriting, QuillBot’s interface is more intuitive; if your needs are diverse, ChatGPT is worth the paid subscription.

On "Using QuillBot to Avoid Plagiarism Checks"

Many students use QuillBot to rewrite plagiarized content to pass plagiarism detection systems, a usage pattern that warrants special attention:

Academic Integrity Issues: Submitting content rewritten by QuillBot from others’ work is considered academic dishonesty in most schools. It is no different in nature from direct plagiarism—both involve using others’ ideas without providing appropriate attribution.

AI Content Detection: An increasing number of schools use AI writing detection tools, and content rewritten by QuillBot may sometimes be flagged as AI-generated.

Using QuillBot to improve the expression of your own writing is reasonable; using it to evade plagiarism checks is academic dishonesty, and you bear the risk yourself.

QuillBot excels in the niche of English rewriting. For appropriate use cases (optimizing your own writing, learning different expressions), it is a highly practical tool. The free version’s features are sufficient for most users.