QuillBot
AI paraphraser and writing suite for students and researchers
Acquired — still operating
acquired by Learneo Aug 2021
About
QuillBot started as an AI paraphrasing tool and grew into a full writing suite aimed at students, researchers, and content creators. The signature Paraphraser offers multiple rewriting modes — Standard, Fluency, Formal, Simple, Creative, plus Academic, Expand, and Shorten on Premium — with a slider controlling how aggressively text is reworded. Around it sit a grammar checker, summarizer, plagiarism checker, citation generator, translator, and Co-Writer, a project workspace combining research, notes, and drafting. Founded in 2017 and acquired by Learneo in August 2021, it reports roughly 35 million users and around $27.4 million in 2025 revenue (company-reported). The free plan is genuinely usable but caps paraphrasing at 125 words and limits modes; Premium runs about $4.17/month billed annually. Reviewers note occasional contextual errors and a weaker grammar engine than dedicated grammar tools.
What it can do
- Paraphraser with 7+ rewriting modes and rewording slider
- Grammar checker and summarizer
- Plagiarism checker (Premium)
- Citation generator for academic formats
- Co-Writer integrated research and drafting workspace
- Browser extension and Word/Google Docs integrations
Setup
Sign up on the website; works in the browser with extensions for Chrome and add-ins for Word and Google Docs. Free tier needs no payment; Premium unlocks all modes and higher limits.
Prerequisites
A web browser. Word/Docs integrations need the respective apps.
Use cases
Works with
Trust score — 8/10
Scored 8/10 (verified tier, metrics-v1). Evidence: Founded 2017, acquired by Learneo 2021; ~$27.4M 2025 revenue (company-reported); Feature set (7+ paraphrase modes, Co-Writer, citation generator) verified across reviews; Limitation: weaker grammar engine than dedicated tools, per reviewers.
Sources
Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.