Duolingo vs Riiid

By valuation, Duolingo is the larger company at $5.2B versus $1B — a 5.2x difference. Size can also be measured by team: Duolingo employs 850 people while Riiid has 100-500 employees.

Riiid has raised more in total funding at $220M, compared to Duolingo's $183.3M — a gap of $36.7M. Combined, the two companies have completed 7 known funding rounds.

Duolingo leads with an Awaira Score of 92/100, while Riiid sits at 80/100. That 12-point gap reflects real differences in funding, scale, and traction — it's not a vanity metric.

Duolingo was founded by Luis von Ahn in 2011. Riiid was founded by Jang Young-jun in 2014. Visit each company's profile on Awaira for a full founder biography.

Duolingo: Duolingo is a language-learning platform founded in 2011 that uses gamification and adaptive AI to teach over 40 languages to millions of users globally. The company's core product is a mobile and web application that breaks language instruction into bite-sized lessons, typically five to ten minutes long, combining vocabulary, grammar, listening, and speaking exercises. Duolingo's AI-powered algorithm personalizes learning paths based on user performance, adjusting difficulty and content recommendations in real-time. The platform employs spaced repetition and reinforcement learning techniques to optimize retention. The company monetizes through a freemium model, offering free basic access with ads and a premium subscription (Duolingo Plus) for ad-free learning and offline access. As of 2024, Duolingo is a publicly traded company with a $5.2 billion valuation and has accumulated $183 million in total funding. The platform serves over 500 million users worldwide, with particular strength in younger demographics and developing markets. Duolingo competes with established players like Rosetta Stone and Babbel, though its gamified approach and mobile-first design have captured significant market share. The company has expanded beyond language learning, introducing math and music offerings. Revenue growth has been substantial, with the company achieving adjusted EBITDA profitability before its 2021 IPO, though it reported net losses on a GAAP basis, demonstrating strong unit economics and user retention metrics. Duolingo's integration of behavioral psychology through gamification and AI-driven personalization has made language learning accessible and habit-forming at massive scale. Riiid: Riiid develops AI-powered adaptive learning and test preparation technology, most notably the Santa TOEIC app, which uses reinforcement learning and knowledge tracing algorithms to personalise English proficiency test preparation for individual learners based on their demonstrated strengths and weaknesses. The Seoul company builds AI models that predict which questions each student should practice to maximise test score improvement per unit of study time.\n\nThe company raised approximately $220 million including a Series D from investors including SoftBank Ventures Asia, Owl Ventures, and GoodWater Capital, reaching a valuation exceeding $1 billion. Riiid Santa TOEIC app has been used by millions of Korean learners preparing for the TOEIC English proficiency exam, which is a mandatory or strongly encouraged credential for employment at major Korean corporations. The company has expanded its AI tutoring technology beyond TOEIC into other standardised test preparation and enterprise training applications.\n\nRiiid competes in the AI education market against Duolingo, Khan Academy, and Korean education technology companies including Classting and Mathpresso. Its reinforcement learning-based adaptive learning system, which optimises study sequences for individual score improvement rather than presenting content in a fixed curriculum order, represents a technically sophisticated approach to personalised learning that distinguishes it from content-first edtech platforms. The proven consumer use case in TOEIC preparation provides a revenue foundation and model validation that the company is extending into new learning domains.

Duolingo got there first, launching in 2011 — that's 3 years of extra runway. Riiid didn't arrive until 2014. In AI, that kind of head start means more training data, deeper customer relationships, and a bigger talent moat.

Duolingo has about 850 employees; Riiid has about 100-500. A bigger team usually means more revenue or heavier VC backing, but in AI, small teams can build at massive scale.

Yes — they're direct rivals. Both Duolingo and Riiid compete in AI Education, targeting many of the same buyers. If you're evaluating one, you should be looking at the other.