Calenvi - Lịch Âm Việt is a productivity application designed for iPhone users to efficiently manage their time and tasks. It features both lunar and solar calendars displayed on a single screen, enabling users to easily track and plan for events and traditional holidays. The app also includes a reminder function that ensures users never miss important dates, from birthdays to business meetings.

Additional features of Calenvi include automatic event backup via Google Drive, requiring a Google account for use. The app offers a convenient home screen widget for quick access to calendar information without needing to open the application. Users can also personalize their experience by choosing a primary color theme, ranging from subtle and elegant to vibrant and dynamic, making time management a stylish endeavor.