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Chasing 100M Daily Users, Duolingo Reconsiders Ads, Paying Influencers, and Its Most Expensive Plan

AI got cheap enough that Duolingo’s most expensive plan may not survive it. I read the earnings call transcript and opened the app to see what is actually changing for learners.

Dhawal Shah Sep 03, 2026

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从天下到世界：近代中国的历程


以大历史视野梳理18世纪中期至19世纪中期中国从“天下”秩序走向世界的关键转变。
- XuetangX
- Self-Paced
- Free Online Course
传播理论前沿


打破传播学科边界，梳理前沿理论思潮并探索传播学本土化的可能。
- XuetangX
- Self-Paced
- Free Online Course
基础西班牙语：语音与会话（西语版）

一起来学习西班牙语的发音与会话吧！
- XuetangX
- Self-Paced
- Free Online Course
Basic spanish: pronunciation and conversation

一起来学习西班牙语的发音与会话吧！
- XuetangX
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理解马克思


通过历史语境与文本细读理解马克思思想，并评估其理论在当代的生命力。
- XuetangX
- Self-Paced
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当代社会中的科学与技术


Explore the complex interplay between science, technology, and society, examining ethical implications, historical development, and future challenges while developing a balanced perspective on technological progress.
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软件测试


系统学习软件测试方法，并实践功能、性能、适配与开发者测试。
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智能感知技术


感知世界，智算未来——开启你的智能感知第一课。
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经验软件工程


学习运用经验研究方法设计、实施和评价软件工程研究。
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Korea University
Mathematical Fundamentals for Data Science

머신 러닝 알고리즘 자체가 아닌 선형대수, 확률·통계, 다변수 미적분, 최적화의 기초로 데이터 과학을 위한 수학적 배경을 다룹니다.
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Cloud Computing and Artificial Intelligence

클라우드와 인공지능 환경에서 IoT 데이터를 저장·처리하고 머신러닝·딥러닝·자연어 처리의 기초와 응용을 살펴본다.
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新媒体与社会治理


从新媒体视角分析社会治理的新局面，并探讨网络问政、风险应对、公共服务与舆论监督等实践。
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知识产权法学


系统学习著作权法、专利法与商标法，结合案例分析知识产权侵权救济及现实法律问题。
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《论语》的智慧


《论语》是研究孔子思想的根本依据。这是一部百科全书式的著作。它以仁学为核心，深刻阐发了为人、为学、为政三位一体的智慧，是取之不竭、用之不尽的精神宝藏。
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复变函数


让学生掌握复变函数的数学理论体系，熟悉基本概念和定理的几何背景和实际应用背景；培养学生的数学素质，提高其数学认知能力和应用数学知识解决实际问题的能力。
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