What are some alternatives?
When comparing HearSeeParty and Decim8, you can also consider the following products
Glitchatron - Destroy your favorite photos
Photomosh - Turn anything into a vaporwave
MVGEN - Make your own music videos with audio, gifs, and special effects
Tumblr Music Video Generator - turn Tumblr accounts into music videos
Glitch Wizard - Create trippy glitch photos and animated GIFs
Gif Sound - Combine Gifs and audio