We stumbled upon a bullish thesis on Duolingo, Inc. on Antonio’s Substack Investment Ideas by Antonio Linares. In this article we will summarize the bulls thesis on DUOL. Duolingo, Inc. shares were trading at $142.80 on January 28. DUOL’s trailing and forward P/E were 18.40 and 25.51 respectively according to Yahoo Finance.
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Duolingo, Inc. operates as a mobile learning platform in the United States, the United Kingdom, and internationally. Duolingo is entering what can be described as a fortune-making phase, as the market is misinterpreting a natural slowdown in daily active user growth as competitive pressure from ChatGPT rather than a deliberate strategic shift. In reality, Duolingo is an AI-native company and management has explicitly stated that platform retention remains strong, with no significant changes seen. Historically, Duolingo’s growth has never been linear.
When DAU growth stalled in the past, the company successfully re-accelerated by identifying and optimizing a single metric that disproportionately drove user lifetime value, strengthening its ability to alternate between phases of growth while preserving long-term value creation. This operational discipline remains intact today, even as the company services just over 50 million DAU within what management views as a multi-billion dollar global education opportunity, positioning Duolingo as a potential operating system for learning.
Duolingo continually balances monetization, user growth, and instructional quality, dynamically prioritizing one lever without sacrificing the others. This approach is evident in its fluctuating but steadily increasing free cash flow margins, along with strong revenue and operating cash flow growth, underscoring exceptional execution.
Management has now expressed a renewed emphasis on improving learning outcomes, confident that better teaching ultimately translates into sustained user growth, as it has done historically. Importantly, this strategic approach does not compromise financial performance, with adjusted EBITDA margins approaching long-term goals even as the company continues to invest in innovation.
New product features like Energy are already demonstrating the effectiveness of this strategy by simultaneously driving bookings and DAUs. Fundamentally, Duolingo’s value creation is driven by rapid iteration, a process significantly accelerated by AI, enabling faster improvement of learning outcomes at a lower cost. As teaching effectiveness increases, free cash flow per share is about to accelerate materially. With long-term share prices ultimately following free cash flow, Duolingo appears materially undervalued, offering investors the opportunity to own an extraordinary business at a time of widespread misperception.