What are some alternatives?
When comparing Pretty Captions and Instaspacer, you can also consider the following products
Captioned - Say, show, share. Create a 60 second captioned video.
Caption Writer for Instagram - Notepad for Instagram – but better.
Drake Captions - Find the perfect Drake lyric for your Instagram caption
Caption This - Create a smart caption for your photo in a second!
Caption - Open-source captioning tool to help find the right subtitles.
Quik by GoPro - Easiest way to create awesome videos