Redação Enem: Concepts and Allusions is a free Android application developed by Android Apps Storm that aims to improve the writing skills of students preparing for the Enem exam. The app provides a comprehensive list of concepts that can be expected to appear in Enem essays and allusions that can be used to enhance the quality of the essay. The allusions are categorized into Historical, Literary, and Cinematic references, and the app also offers useful tips to craft an impressive essay.

The app's interface is user-friendly and easy to navigate, with a search bar that makes it easy to find specific concepts or allusions. The app's content is relevant and accurate, making it an excellent resource for students preparing for the Enem exam. However, the app lacks interactive features such as quizzes or writing prompts, which would have made the learning experience more engaging.

Overall, Redação Enem: Concepts and Allusions is a useful app for students preparing for the Enem exam who want to improve their writing skills by incorporating relevant concepts and allusions into their essays.