Gramática Portuguesa em Uso is an Android app developed by MeknaSoft, which is designed to help beginners and advanced Portuguese students learn the rules of Portuguese grammar and spelling. The app is an excellent resource for those who want to improve their writing and speaking skills. The app is free to download and use, making it accessible to everyone.

The app includes lessons on various aspects of Portuguese grammar, including signal word processing, punctuation marks, concrete and abstract nouns, bending of nouns, simple and compound nouns, primitive nouns, nouns own, common nouns, collective nouns, nouns derivatives, nouns epicenos, nouns sobrecomuns, pronouns, personal pronouns, demonstrative pronouns, relative pronouns, interrogative pronouns, pronouns treatment, indefinite pronouns, adjectives, substantivation adjectives, plural formation of adjectives, simple and compound adjectives, adjectives primitives and derivatives, double lanterns adjectives, uniform adjectives, conjugation periphrastic, and passive voice.

The lessons are easy to understand and include relevant examples to aid comprehension. The app is user-friendly and easy to navigate, making it perfect for beginners. The app is an excellent tool for anyone who wants to learn Portuguese grammar, improve their writing skills, or prepare for language exams.