Captionpop is described as 'The best way to experience YouTube as a language learned.
Repeat the last sentence with a single keystroke.
Slow down the video.
Bookmark subtitles to study later.
Works with any YouTube video that has subtitles' and is a language learning tool in the education & reference category. There are seven alternatives to Captionpop, not only websites but also apps for a variety of platforms, including Google Chrome, Safari, Mozilla Firefox, Microsoft Edge and Chromium apps. The best Captionpop alternative is Subtify Studio, which is free. Other great sites and apps similar to Captionpop are EasySubs, Language Reactor, Youtube Bilingual Subtitles and Netflix Dual Subtitle.