QuillBot

QuillBot is built around a single core mechanic: paste text in, get rewritten text out. The paraphrasing engine processes your input in real time and returns alternative phrasing across five distinct modes. Standard, Fluency, Formal, Creative, and Concise. So you can dial in tone without rewriting from scratch. A synonym slider lets you control how aggressively the tool swaps individual word choices, giving you fine-grained control over the output rather than just accepting whatever the model decides.

Beyond paraphrasing, QuillBot stacks a grammar checker, a summarizer, a plagiarism checker, and a citation generator into one workspace. The co-writer mode pulls these tools together so you're not constantly switching tabs. A browser extension brings the paraphraser directly into Google Docs, Gmail, and other web editors, which makes it genuinely useful as a daily writing layer rather than a standalone destination.

The free tier is more useful than most: you get access to the paraphraser (with a word cap per session and a subset of modes) plus basic grammar checking at no cost. Premium removes those limits, opens all five paraphrasing modes, speeds up processing, and adds full plagiarism checking. QuillBot's sweet spot is students and budget-conscious writers who need dependable paraphrasing and light editing support. It's not trying to be a full-blown AI writing assistant like Jasper or Copy.ai, and that focus is actually its strength.