Royal's HYK Dictionary stands out as a versatile educational tool designed for learners of Korean, especially targeting Cambodian students. This free app offers an offline 3-in-1 dictionary, featuring over 43,000 words and phrases, making it invaluable for translation needs. Users can conduct instant searches across Korean, English, and Khmer, enhancing the learning experience. The app also includes 50 basic Korean proverbs and provides both Khmer and Korean alphabets, along with Korean phonetics for Khmer words, which aids in pronunciation.

The app's user interface is available in both English and Korean, catering to a diverse audience. Users can save bookmarks to local storage or upload them to cloud services for easy access. Additionally, the option to export bookmarks as flashcards supports further study of vocabulary. A home screen widget is also included for quick access to bookmarks. However, it's important to note that users must install Khmer Unicode if their device does not run Android KitKat 4.4 or higher to fully utilize the Khmer translation feature.