What are some alternatives?
When comparing Pretty Captions and Captioned, you can also consider the following products
Instaspacer - Putting the spaces back into Instagram
Quik by GoPro - Easiest way to create awesome videos
Caption Writer for Instagram - Notepad for Instagram – but better.
MotionDen - Free online animated video maker
Drake Captions - Find the perfect Drake lyric for your Instagram caption
Caption This - Create a smart caption for your photo in a second!