QuillBot

QuillBot is one of the most widely used AI writing helpers, best known for its paraphraser. Paste in a sentence or paragraph and it rewrites the wording and structure while trying to preserve the meaning — handy for clarifying a clunky draft, varying repetitive phrasing, or adapting formal text into something plainer. It reports tens of millions of users, many of them students and non-native English writers.

QuillBot is owned by Learneo (the parent company behind Course Hero), which acquired it in 2021. Over time the product grew from a single paraphrasing box into a small writing suite: a summarizer, a grammar checker, a citation generator, and a translator. That positions it against Grammarly on grammar and Wordtune on rephrasing, though paraphrasing remains its core draw.

Key Features

• Multiple paraphrasing modes (Standard, Fluency, Formal, Creative, Shorten, Expand)
• Synonym slider to control how much wording changes
• AI Summarizer that condenses long documents into key points or a paragraph
• Grammar and spelling checker with inline suggestions
• Citation generator for APA, MLA, and Chicago
• Chrome extension and Microsoft Word add-in
• Built-in translator for cross-language rewriting

Pricing

• Free: paraphrasing capped at a limited word count per pass, with a subset of modes
• Premium (~$10/month billed annually): unlimited paraphrasing length, all modes, faster processing, tone detection, and frozen “keep these words” controls

Best For

Students, ESL and non-native English writers, and content creators who need to rephrase text for clarity, reduce repetition, tighten wordy passages, or shift a draft between formal and casual registers.

Limitations

The free plan’s word cap and locked modes push regular users toward Premium quickly. Heavier rewrites can flatten voice or subtly shift meaning, so output still needs a human read. And because paraphrasing works by swapping synonyms and reordering, it should not be treated as a way to dodge plagiarism or AI-detection checks.