Santos, George Augusto ValençaCastro, João Vítor da Cunha2025-08-222025-07-01CASTRO, João Vítor da Cunha. Teaching or manipulating? On the adoption of bright and deceptive patterns by Duolingo. 2025. 20 f. Trabalho de Conclusão de Curso (Bacharelado em Ciência da Computação) – Departamento de Computação, Universidade Federal Rural de Pernambuco, Recife, 2025.https://arandu.ufrpe.br/handle/123456789/7557Artigo aceito no XXIV Simpósio Brasileiro sobre Fatores Humanos em Sistemas Computacionais (8 a 10 de Setembro de 2025). link: https://grupoaspas.com/?p=1857 Mais detalhes após publicação.In 2024, Duolingo surpassed 100 million active users, with a significant portion of children. However, the valuable educational opportunities may be combined with potential risks associated with a business model based on user engagement and manipulative design. In this article, we critically analyze the design of Duolingo from the perspective of fair and deceptive design patterns. Although Duolingo adopts practices considered ethical for children’s welfare, such as clear interface design, this study identifies the presence of deceptive elements that raise concerns, including the excessive notifications to maintain engagement. We believe this study supports the ongoing debate on children’s rights by design and ethics of educational apps.20 f.en-USopenAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/Aplicativos móveisDireitos das criançasComportamento manipuladorTecnologia educacionalComunicação em língua estrangeirabachelorThesisAttribution-NonCommercial-NoDerivatives 4.0 International