IdeoCal 農曆萬年曆免費版 is a refined and elegant perpetual calendar for iPhone users. In addition to the western calendar, it displays Chinese lunar dates, lunar holidays, the twenty-four solar terms, Chinese zodiac signs, moon phases, sexagenary cycles, and public holidays in Taiwan and Hong Kong. The free version offers daily and full-page display modes, enabling users to access detailed lunar information effortlessly.

IdeoCal supports Retina Display and iPhone 5's 4-inch screen, ensuring clear text and graphic details. Users can easily navigate through dates, view lunar and solar information, and customize the calendar display according to their preferences. This app provides a user-friendly interface for accessing Chinese lunar calendar information seamlessly.