What are some alternatives?
When comparing Gif Slice and Tall Tweets for Google Slides, you can also consider the following products
GifBook - Make animated GIFs into paper flip books
Plotaverse - Photo animation made easy, animate like the pros
Print A Gif - Turn any gif into a printable flip book
Instagfy - Make a GIF with your most popular photos on Instagram
Gif Cube - Turn gifs into physical cubes
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.