Subtitles
Every major service includes subtitles in several languages. Open the speech-bubble or audio menu in the player and choose a language.
Korean and Hindi
Korean and Hindi films play in their original language with English subtitles, and many Hindi films are also offered in Tamil and Telugu.
Audio description
Many services include an audio description track, listed in the same menu.
Style
Most apps let you change the size and colour of subtitles in their settings.