Both the Horizon Client user interface and the documentation are available in English, Japanese, French, German, Simplified Chinese, Traditional Chinese, and Korean. International keyboards of English-United States, Japanese, French, German, Simplified Chinese, Traditional Chinese, and Korean are supported.

To choose a language for the keyboard or voice, tap the Keyboard Settings key on the onscreen keyboard. The Keyboard Settings key is the left-most key on the bottom row of the onscreen keyboard.