Quizlet was founded in 2005 by Andrew Sutherland, then a 15-year-old high-school sophomore, who built a digital flashcard tool to study French vocabulary. What began as a simple alternative to paper flashcards has since grown into one of the world's largest online learning platforms, headquartered in San Francisco and serving students and teachers globally.
The platform combines cognitive science and machine learning to personalise study experiences across subjects and skill levels. Its product suite has expanded well beyond flashcards to include practice quizzes, AI-powered learning tools, and a broad student-teacher community - all built on a freemium model with revenue from subscriptions and advertising.
Quizlet's scale reflects its reach in education: the platform serves tens of millions of students each month, powers over 2 billion learning interactions monthly, and counts roughly two-thirds of U.S. high schoolers and half of U.S. college students among its users. Its audience spans K–12, higher education, working professionals, and lifelong learners worldwide.
The company's stated belief - that anyone can learn anything with the right tools and guidance - shapes its approach to product development, with a continued focus on accessibility, AI-driven personalisation, and sustainable growth.
