Subtitles only capture what is spoken on screen. They are straight transcriptions or translations of the dialogue.
Closed captions aim to capture all events in the audio track besides dialogue. They may well indicate gunshots, screaming, a song being played etc. "Closed" means they can be turned off.
Closed captions are mainly designed for hearing impaired viewers. However, most streaming channels these days mandate closed captions for reasons besides physiological hearing issues. Your audience will often watch films on a laptop in a noisy cafe, or a tablet on a commuter train, or a TV in a bar - or simply at home in the kitchen with the sound of cooking and kids. Closed captions allow consumers in all these scenarios to enjoy your content comfortably.
We require all English-language content submitted with closed captions.