What are some alternatives?
When comparing Automatic GIF Creator and GIPHY Says, you can also consider the following products
Tall Tweets for Google Slides - Tweet your Google Slides as animated GIF images
Guggy - Make your friends laugh with personalized GIFs
Gifs - Search through a library of hundreds of GIFs that you can send in your messages or that you can share to social media pages.
GifLab - The easiest way to create GIFs on your iOS device
Instagfy - Make a GIF with your most popular photos on Instagram
GIPHY GIF maker - Create animated GIFs from videos (by Giphy)