Grammaticus provides iOS-native versions of essential Greek and Latin grammars such as Smyth's Greek Grammar, Allen and Greenough's New Latin Grammar, and Goodwin's Syntax of the Moods and Tenses of the Greek Verb. It offers powerful search and navigation tools, including full-text access to these works from the Perseus Project website.

Users can easily browse the table of contents or directly jump to any section without an Internet connection. The app supports full-text search in English, Greek, and Latin, allowing users to search for specific terms or words efficiently. Additionally, users can search for citations by author or work, and bookmark sections for quick access.