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