YesGram is an Android application developed by Max Snegov, which offers a comprehensive guide to English grammar. The app provides users with exercises and grammar rules on various topics for free. It's an excellent tool for learners who want to improve their English language skills.

The app's interface is simple and user-friendly, making it easy to navigate. Users can access all the sections of the guide, including tenses, parts of speech, and sentence structure, among others. The app's exercises are interactive and engaging, allowing users to test their knowledge while also learning.

Overall, YesGram is an excellent choice for learners who want to improve their English grammar skills. It's free, easy to use, and provides a comprehensive guide to English grammar.