QuillBot

QuillBot has built a large user base primarily among students and researchers who use it for paraphrasing, summarising, and refining written content. It occupies a more specific niche than Grammarly (which corrects existing writing) or ChatGPT (which generates new content): QuillBot is specifically optimised for the task of rewording existing text while preserving its meaning.

The seven writing modes, ranging from Standard and Fluency to Formal, Academic, Creative, Simple, and Expand, allow users to guide the paraphrased output toward the appropriate register for different contexts. Academic mode, for example, produces more formal and technically precise rewording, while Simple mode targets more accessible language. This mode variety is more sophisticated than single-mode paraphrasers.

The synonym slider lets users control how aggressively words are replaced, from minimal changes that preserve the original phrasing to maximum paraphrasing that produces substantially different wording. This control is useful for users who want to avoid plagiarism detection in legitimate academic rewriting contexts.

Grammar checking and plagiarism detection (compared against online sources) are included features that extend QuillBot beyond pure paraphrasing. Summarisation can condense long-form content to key points.

The ethical dimension of QuillBot is worth noting. While the tool has legitimate uses for improving clarity, adapting content for different audiences, and academic editing, it is also commonly used to disguise paraphrased content from plagiarism checkers. Educational institutions have varied policies on AI writing tools, and students should check their institution's specific guidelines before using QuillBot for academic work.

Premium at $4.17 to $9.95 per month is affordable and removes the free plan's 125-word limit.