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As of 2026
Productivity
Revenue: $50M - $100M
An AI-powered writing companion that helps users paraphrase, check grammar, summarize, and cite sources to improve their writing fluency.
Overview
QuillBot is a comprehensive AI writing platform designed to help users improve the quality, clarity, and flow of their writing. Originally popular for its industry-leading paraphrasing tool, it has evolved into a full-suite assistant that provides grammar checking, summarization, citation generation, and translation, making it an essential companion for students, researchers, and professional writers seeking to streamline their editing and proofreading processes.
Founded year: 2017
Founder: Rohan Gupta, Anil Jason, David Silin
Team size: 50-200
Popularity: Extremely high market penetration among students and writers
HQ: Chicago, Illinois, USA
Status: Active
Funding status: Acquired
Revenue source: Subscriptions
Customer type: B2C
Funding: Acquired by Course Hero
Pricing: Freemium
Tech stack: NLP, Machine Learning, Cloud-native API, Browser extension frameworks
Platform: Web • iOS • Android
Integrations: Google Chrome, Microsoft Word, Google Docs, MacOS
Founder story
QuillBot was founded in 2017 by Rohan Gupta, Anil Jason, and David Silin in Chicago, Illinois. Recognizing that writing is a significant source of frustration for many, they set out to build tools that make writing more accessible and efficient. Their mission was to create an AI assistant that could do more than just correct errors—it could improve the writer's style, voice, and effectiveness.
What it does
- Provides advanced paraphrasing with multiple modes (Standard, Fluency, Formal, Simple, Creative)
- Includes an AI-powered grammar and spell checker for error-free writing
- Summarizes long documents and articles into concise, actionable points
- Generates citations in various formats (APA, MLA, Chicago, etc.) for academic writing
- Offers a co-writer tool for real-time document drafting and research assistance
Who it's for
- Students and Academics
- Content Creators
- Non-native English Speakers
- Professional Writers
Why it works
- Simplifies the complex task of rewording text for better readability and tone
- Provides instant, high-quality feedback that helps users improve their own writing skills
- Supports multiple languages, making it globally accessible to diverse user bases
- Integrates seamlessly into popular browser and writing environments for a smooth workflow
- Offers a clear value proposition that directly addresses common writing anxieties and time-sinks
Growth strategies
- Aggressive SEO strategy targeting high- intent 'paraphrasing' and 'grammar' keywords
- Strategic freemium model that drives massive organic user acquisition
- Cross- platform accessibility through browser extensions, web apps, and Microsoft Word plugins
- Continuous product expansion into new writing utilities to increase user stickiness
Alternatives
Comparison overview
- QuillBot is widely regarded as the gold standard for AI paraphrasing, offering more nuance and variety in tone modes compared to rivals like Wordtune
- While Grammarly is primarily focused on grammar and surface-level correctness, QuillBot excels at structural transformation and style enhancement, making it a complementary rather than purely competitive tool.