QuillBot

QuillBot is a writing tool that started with English paraphrasing and is especially well known among international students and people who write in English as a second language. What it does is focused: say the same thing in different words while keeping the meaning. You can choose a rewriting style — more formal, more concise, more fluent — and dial how much changes, from swapping a few words to restructuring the whole sentence.

Around paraphrasing it has grown an English-writing toolbox: grammar checking, summarising, citation generation, translation and AI-content detection. None of these is best-in-class on its own, but having them in one interface, plus browser and Word extensions, makes everyday English text work convenient.

Be clear-eyed about one thing: paraphrasers cut both ways in academic settings. Polishing your own sentences is fine; running someone else’s text through it to dodge plagiarism checks is misconduct, and rewrites can quietly shift the meaning. Its AI detector should be treated as a rough signal, not a verdict.

Key features

• Paraphraser: Several styles, an adjustable degree of change, and synonym suggestions for word-by-word swaps.
• Grammar checker: Flags spelling, grammar and punctuation errors with suggested fixes.
• Summariser: Condenses long passages or articles into key points or a short paragraph.
• Citation generator: Builds reference entries in APA, MLA and other common styles.
• AI detector: Estimates how likely a piece of text is to be AI-generated.
• Browser and Word extensions: Use paraphrasing and checks directly in web pages, email and documents.

How to use

1. Go to quillbot.com; free tools work without an account, and signing up keeps your history.
2. Pick a tool, such as the paraphraser or grammar checker, and paste in your English text.
3. When paraphrasing, choose a style, set the degree of change with the slider, then click words to see alternatives.
4. Compare each sentence with the original to make sure the meaning hasn’t drifted.
5. If you write in English a lot, install the browser or Word extension and edit in place.

Best for

• Polishing English papers and assignments: making awkward sentences read naturally.
• English emails and work documents: adjusting tone to be more formal or more concise.
• Avoiding repetition: varying the wording of similar points within one piece.
• Digesting English material quickly: summarise first to get the gist.

Strengths and limitations

Strengths

• A mature paraphraser with controllable style and intensity, easier to steer than a general chatbot.
• Writing tools gathered in one place, with extensions for common writing environments.
• The free version covers light everyday use.

Limitations

• Built for English; results in Chinese and other languages are noticeably weaker.
• Rewrites can change the meaning, so technical terms and key arguments need checking sentence by sentence.
• The AI detector is unreliable and shouldn’t be used to judge whether someone used AI.
• The free version limits modes and input length; heavy use needs a subscription.