Rapid English Grammar is an Android application developed by krigonan, falling under the Education & Reference category. The app offers a systematically organized English grammar course to help learners improve their English speaking skills. The developer has ensured that the app is free of ads, making it a seamless user experience. Moreover, the app is 100% offline, allowing learners to use it without internet connectivity.

The app teaches the rules of tenses in Hindi, including present, past, and future tenses. It also covers the use of helping verbs and modal verbs, such as can, could, may, might, must, ought, shall, should, will, and would. The app provides an in-depth understanding of grammar rules, including nouns, pronouns, verbs, adjectives, adverbs, prepositions, preposition lists, conjunctions, and interjections. Learners can also learn about articles, such as A, An, or The, and the use of It and There, This & That, These & Those. Additionally, the app covers the active and passive voices in English and provides conversations to help learners practice speaking English.

Overall, Rapid English Grammar is a comprehensive app for anyone who wants to learn English grammar quickly and efficiently.