Common Mistakes in English is an Android app developed by Old Gate that aims to help non-native English speakers improve their language skills. The app focuses on seven main topics, including the misuse of prepositions and infinitives, incorrect omissions of prepositions, and confusion of parts of speech. Students can also expect to find exercises to practice their skills.

The app utilizes a uniform method of teaching and highlights specific errors before providing simple explanations. This makes it easy for students to understand and learn from their mistakes. Common Mistakes in English is a free app, making it accessible to anyone who wants to improve their English skills. Overall, this app is an excellent resource for non-native speakers looking to improve their language proficiency.