Video with captions are not only accessible, but Facebook found that videos with captions are watched loger than those without: the video can remain silent, and the viewer can continue to understand the context.

However, adding captions manually is a pain, so using automated tools is the way to go. caption.a.video is a demo application that, after you upload a video to api.video, it is sent to our partners Authot. They take the video, and transcribe the audio, creating a webVTT file that can be added back with the video to add subtitles to the video.