What are some alternatives?
When comparing Pretty Captions and Caption This, you can also consider the following products
Captioned - Say, show, share. Create a 60 second captioned video.
Instaspacer - Putting the spaces back into Instagram
Speechyard - Learn English online through movies!
Caption Writer for Instagram - Notepad for Instagram – but better.
Caption - Open-source captioning tool to help find the right subtitles.
Drake Captions - Find the perfect Drake lyric for your Instagram caption