What are some alternatives?
When comparing Caption This and Caption, you can also consider the following products
Speechyard - Learn English online through movies!
OpenSubtitles.org - OpenSubtitles.org was developed for easy downloading and uploading subtitles for movies.
Captioned - Say, show, share. Create a 60 second captioned video.
Subscene - Subscene is a site where you can find subtitles for almost any movie or TV and movie show in almost...
VEED Subtitle - A simple & fast way to add subtitles to your videos online
Subtly - Learn English with smart subtitles on movies and TV shows