Black Keys is a utility and tools application developed by LE SANG for iPhone users. It offers multilingual keyboards for unsupported languages and typing in the International Phonetic Alphabet (IPA). The app also features a black mode that is not only simple but also easy on the eyes.

With Black Keys, users can check if their language is supported and download the necessary keyboard. The app provides support for a variety of languages including IPA, Arabic group languages (Dari, Pashto, Sorani Kurdish, Uyghur), and languages that require font installation (Amharic, Burmese, Coptic, N'ko, Tifinagh). Additionally, Black Keys supports languages like Khmer, Inuktitut, Georgian, Armenian, Sinhala, Lao, Kazakh, Nepali, Bangla, Gurmukhi, Malayalam, Gujarati, Kannada, Oriya, and Telugu.

It is worth noting that some keyboards have hidden letters accessible through long presses, such as Amharic, Dari, Pashto, and Sorani Kurdish. The app provides video tutorials to help users understand how to use these features effectively. For languages like Burmese and Sinhala, Black Keys offers smart combinations to enhance typing speed, with tutorial videos available within the app.

Please note that Persian and Syriac languages have been deprecated and moved to the SwipeKeys app. If users encounter any issues with missing letters or wish to improve the app's functionality, they can contact the developer through the Facebook page: [Facebook page link].