Is DUOL a good stock to buy? We came across a bullish thesis on Duolingo, Inc. on Investment Ideas by Antonio’s Substack by Antonio Linares. In this article, we will summarize the bulls’ thesis on DUOL. Duolingo, Inc.’s share was trading at $102.63 as of April 21st. DUOL’s trailing and forward P/E were 11.98 and 13.68 respectively according to Yahoo Finance.
Copyright: kbuntu / 123RF Stock Photo
Duolingo, Inc. operates as a mobile learning platform in the United States, the United Kingdom, and internationally. DUOL is building a compounding value creation system driven by proprietary learner data that materially enhances AI tutoring performance and increases customer lifetime value per dollar spent. The company thesis centers on leveraging this data to train increasingly capable AI language tutors that outperform generic models in personalized instruction.
Read More: 15 AI Stocks That Are Quietly Making Investors Rich
Read More: Undervalued AI Stock Poised For Massive Gains: 10000% Upside Potential
A randomized controlled trial highlighted in the white paper shows that Japanese English learners using GPT-4o powered Video Calls with Duolingo achieved significantly stronger speaking gains over a control group after thirty days. Speaking performance correlated strongly with total words spoken per session indicating that engagement depth directly drives learning outcomes. Notably users showed higher willingness to speak to AI tutors than to human partners suggesting a durable behavioral shift toward AI mediated practice while emotional confidence gains lagged behind skill improvements.
This creates an opportunity for Duolingo to extend its product suite into real world speaking activation tools that bridge the gap between practice and application. The implication is that Duolingo’s proprietary data flywheel enables superior token efficiency where each incremental AI improvement yields disproportionately higher learner outcomes relative to generic models. As AI scaling laws continue to advance Duolingo is positioned to benefit from both improving base model intelligence and increasingly valuable proprietary training data.
Recent App Store ranking strength further reinforces accelerating user adoption and supports a long duration growth narrative with expanding margins and rising engagement intensity. Overall Duolingo is increasingly emerging as a category-defining AI-native education platform with durable data-driven compounding advantages over time and scale.
Previously, we covered a bullish thesis on Duolingo, Inc. (DUOL) by Lorenzo Bastianelli in May 2025, which highlighted Q1 growth, viral marketing, MAUs, and AI-driven expansion across new learning verticals. DUOL’s stock price has depreciated by approximately 79.61% since our coverage. Antonio Linares shares similar view but emphasizes proprietary data and AI tutoring efficiency gains from RCTs and speaking improvements.
Duolingo, Inc. is not on our list of the 40 Most Popular Stocks Among Hedge Funds. As per our database, 51 hedge fund portfolios held DUOL at the end of the fourth quarter which was 50 in the previous quarter. While we acknowledge the risk and potential of DUOL as an investment, our conviction lies in the belief that some AI stocks hold greater promise for delivering higher returns and doing so within a shorter time frame. If you are looking for an AI stock that is more promising than DUOL and that has 10,000% upside potential, check out our report about this cheapest AI stock.
Disclosure: None.
